diff --git a/.agents/skills/quarterly-ladder-analysis/SKILL.md b/.agents/skills/quarterly-ladder-analysis/SKILL.md
new file mode 100644
index 0000000..7312ce7
--- /dev/null
+++ b/.agents/skills/quarterly-ladder-analysis/SKILL.md
@@ -0,0 +1,128 @@
+---
+name: quarterly-ladder-analysis
+description: Instructions and operational workflow for conducting the Flutter Contributor Ladder quarterly audits (Community Audit and Partner Team Verification).
+---
+
+# Quarterly Contributor Ladder Analysis Skill
+
+This skill guides you through executing Flutter's quarterly contributor reviews across the 30+ day review cycle.
+
+## Step 0: Determine Current Phase in the 30+ Day Process
+
+Before running any mutating commands, **first ask the user (if not already clear from their request) where in the 30+ day quarterly review process we are** (you can also check open `quarterly-review` / `quarterly-review-checklist` issues and open PRs via `gh issue list` and `gh pr list`):
+
+1. **Phase 1 — Kickoff & Opening the PR / Review Issues (Day 1)**: Starting the quarterly review after the automated checklist issue is filed.
+2. **Phase 2 — Mid-Review Check-In (Days 1–30)**: Auditing responses on the open review issue, checking an individual contributor (`tool/check_user.dart`), or tracking partner confirmations during the 30-day window.
+3. **Phase 3 — Finalization & Merging (Day 30+)**: Incorporating 30-day responses into the open quarterly review PR, landing the PR, syncing GitHub/Discord permissions, and closing the issues.
+
+Proceed to the matching phase below.
+
+---
+
+## Phase 1: Kickoff, Ban-History Vetting, Single PR & Review Issues (Day 1)
+
+### 1.1 Preview Nominated Candidates & Ask User for Ban-History Check
+
+1. Ensure you are on a fresh branch off the latest `main` (which is updated daily by `.github/workflows/sync_activity.yml`):
+
+   ```bash
+   git checkout -b YYYY-QX-quarterly-review
+   ```
+
+2. Run `--prepare` in dry-run, non-interactive mode first to see the nominated candidates without writing any files (`tool/quarterly_audit.dart` automatically queries live `flutter` GitHub organization and team membership so every current org member is evaluated):
+
+   ```bash
+   dart run tool/quarterly_audit.dart --prepare --dry-run --no-prompt
+   ```
+
+3. **Present the nominated usernames** (promotions to Committer, returning Dasher Emeriti, and prospective external new joiners) to the user and **ask them to check those usernames against the internal Code of Conduct / ban history list**.
+   - Contributors who were previously banned for Code of Conduct violations remain welcome to contribute as external Contributors after a temporary ban expires, but are not eligible for ladder membership.
+   - Wait for the user to confirm whether any usernames should be excluded before generating files on disk so no one is singled out in reports or commits.
+
+### 1.2 Generate Reports & Update Roster for the Single PR
+
+Once the user confirms any exclusions (or confirms none are needed), run `--prepare`:
+
+```bash
+dart run tool/quarterly_audit.dart --prepare --no-prompt --exclude user1,user2
+```
+
+*(Omit `--exclude` if no candidates are excluded.)*
+
+This single command:
+
+- Writes `reports/YYYY-QX-community-ladder-audit.md` and `reports/YYYY-QX-partner-verification-audit.md` (with excluded users completely omitted).
+- Updates `data/contributors.yaml`, `ROSTER.md`, and `EMERITUS.md`.
+
+### 1.3 Open the Single Quarterly Review PR
+
+Commit the generated reports and proposed roster updates into **1 PR**:
+
+```bash
+git add reports/ data/contributors.yaml ROSTER.md EMERITUS.md
+git commit -m "chore: QX YYYY quarterly contributor ladder review"
+```
+
+This PR stays open throughout the 30-day community review period and does not land until Phase 3 (Day 30+).
+
+### 1.4 Draft & Open the Public Review Issues
+
+Use the tool to preview or open the two public tracking issues from the vetted reports to start the 30-day review period:
+
+```bash
+# Preview drafted issues and gh CLI commands:
+dart run tool/quarterly_audit.dart --draft-issues --pr <PR_URL>
+
+# Or open both issues directly on GitHub via gh CLI:
+dart run tool/quarterly_audit.dart --open-issues --pr <PR_URL>
+```
+
+---
+
+## Phase 2: Manage the 30-Day Grace Period (Days 1–30)
+
+- Inspect responses on the Community Audit issue (`gh issue view <ISSUE_NUMBER> --comments`):
+  - Collect Discord usernames from newly invited contributors (`user=discord_handle`).
+  - Summarize reported qualitative contributions that cannot be quantified automatically (issue triage comments, reproduction verification, [RFC](https://github.com/flutter/rfc) reviews, mentoring) for the user to review.
+  - To inspect a specific contributor's 12-month metrics and current roster status:
+
+    ```bash
+    dart run tool/check_user.dart <username>
+    ```
+
+- Remind the user to reach out to partner teams to confirm active status for `@flutter/partners` members.
+- *(During the 30-day window, `.github/workflows/check_grace_period.yml` runs once a week to post a weekly countdown update on the open review issues, and pings the assignee once 30 days have elapsed.)*
+
+---
+
+## Phase 3: Update the Open PR, Land It & Provision Access (Day 30+)
+
+1. Gather 30-day adjustments:
+   - Read all comments on the open Community Audit issue (`gh issue view <ISSUE_NUMBER> --comments`) and confirm with the user:
+     - `--retain`: Contributors in the 30-day grace period who shared verified qualitative contributions.
+     - `--exclude`: Any previously excluded usernames plus any invited contributors who declined.
+     - `--discord`: `github_user=discord_handle` mappings shared by accepted new joiners, returning Emeriti, and promoted members.
+2. Update the open PR branch:
+   On the open `YYYY-QX-quarterly-review` PR branch, run `--finalize`:
+
+   ```bash
+   dart run tool/quarterly_audit.dart --finalize \
+     --retain user1,user2 \
+     --exclude excluded_or_declined_user \
+     --discord user=discord_handle
+   ```
+
+3. Validate schema and roster sync:
+
+   ```bash
+   dart run tool/validate_roster.dart
+   dart run tool/generate_roster.dart --check
+   ```
+
+4. Commit, push & land the PR:
+   Commit the updated `data/contributors.yaml`, `ROSTER.md`, and `EMERITUS.md` to the PR branch and merge the PR.
+5. Post-merge provisioning checklist:
+   - Update GitHub organization teams (`@flutter/reviewers`, `@flutter/committers`, and `@flutter/maintainers` as child teams of `@flutter/flutter-hackers`, along with `@flutter/partners` child teams) to match `ROSTER.md` (`@flutter/collaborators` is automatically managed by internal tooling and should not be modified manually).
+   - Remove members who transitioned to Dasher Emeritus from the `flutter` GitHub organization.
+   - Grant the Discord team member role to newly added ladder members using their collected Discord handles.
+   - Close the public review issues and the quarterly checklist issue.
diff --git a/.agents/skills/quarterly-ladder-analysis/references/criteria.md b/.agents/skills/quarterly-ladder-analysis/references/criteria.md
new file mode 100644
index 0000000..35c1181
--- /dev/null
+++ b/.agents/skills/quarterly-ladder-analysis/references/criteria.md
@@ -0,0 +1,19 @@
+# Contributor Ladder Metric Criteria Reference
+
+## 12-Month Rolling Criteria Rubric
+
+| Role | GitHub Role | Criteria (Rolling 12 Months) |
+| :--- | :--- | :--- |
+| **Contributor** | `Read` (External) | Any material contribution (code, docs, issue triage, QA). |
+| **Reviewer** | `Triage` (Org Member) | $\ge 10$ qualifying contributions (merged PRs, valid issues, reviews on merged PRs, reproducible issue triage). |
+| **Committer** | `Write` (Org Member) | $\ge 30$ qualifying contributions and $\ge 10$ merged PRs, demonstrating depth, code quality, and technical judgment. |
+| **Maintainer** | `Write` + Org Mod (Org Member) | All members of `@flutter/googlers` and `@flutter/partners` (there are no Maintainers outside of Googlers and Partners). |
+| **Dasher Emeritus** | `Read` (External Alumni) | Inactive community role-holder ($< 10$ contributions in past 12 months after 30-day grace period). Removed from the GitHub org and listed in `EMERITUS.md`. |
+
+## Special Policies
+
+Contributors who have previously been banned for Code of Conduct violations remain welcome to contribute as external Contributors after a temporary ban expires, but are not eligible for ladder membership (`Reviewer`, `Committer`, `Maintainer`). When running `tool/quarterly_audit.dart --prepare` locally, the person running the audit checks the nominated usernames against the internal Code of Conduct / ban history list and excludes any ineligible candidates before any report or roster files are generated, ensuring no one is singled out.
+
+Community members who joined `flutter-hackers` within the 12 months prior to ladder launch receive a one-time 12-month Reviewer transition grace period (`grace_until` in `data/contributors.yaml`). Once that initial year expires, no further recent-joiner carve-outs apply.
+
+Googlers and Partners are automatically classified as Maintainers (while their 12-month contribution history is still recorded in `data/activity_summary.json`), and contributions that cannot be quantified automatically—such as issue triage, reproduction verifications, [RFC](https://github.com/flutter/rfc) feedback, design docs, and mentoring—count toward Reviewer and Committer qualifications when shared during the 30-day review period.
diff --git a/.agents/skills/quarterly-ladder-analysis/references/known_maintainers.txt b/.agents/skills/quarterly-ladder-analysis/references/known_maintainers.txt
new file mode 100644
index 0000000..ab06217
--- /dev/null
+++ b/.agents/skills/quarterly-ladder-analysis/references/known_maintainers.txt
@@ -0,0 +1,8 @@
+# These are known maintainers, listed here by exception due to a sync issue with internal tooling and GitHub.
+CarlosMendonca
+LouiseHsu
+abdallahshaban557
+andywolff
+gaaclarke
+gmackall
+jesswrd
diff --git a/.github/workflows/check_grace_period.yml b/.github/workflows/check_grace_period.yml
new file mode 100644
index 0000000..271d970
--- /dev/null
+++ b/.github/workflows/check_grace_period.yml
@@ -0,0 +1,45 @@
+name: Weekly Grace Period Check
+
+on:
+  schedule:
+    # 03:23 UTC every Monday (Weekly check for open quarterly review issues, offset from top of hour)
+    - cron: '23 3 * * 1'
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: 'Dry run (do not post comments or add labels)'
+        type: boolean
+        default: false
+
+permissions: {}
+
+concurrency:
+  group: check-grace-period
+  cancel-in-progress: false
+
+jobs:
+  grace_period_check:
+    name: Check Open Quarterly Review Issues
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+
+      - name: Set up Dart SDK
+        uses: dart-lang/setup-dart@e51d8e571e22473a2ddebf0ef8a2123f0ab2c02c # v1.7.1
+
+      - name: Install dependencies
+        run: dart pub get
+
+      - name: Check Open Quarterly Review Issues
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          DRY_RUN: ${{ inputs.dry_run || false }}
+        run: dart run tool/check_grace_period.dart
diff --git a/.github/workflows/quarterly_review.yml b/.github/workflows/quarterly_review.yml
new file mode 100644
index 0000000..f350545
--- /dev/null
+++ b/.github/workflows/quarterly_review.yml
@@ -0,0 +1,128 @@
+name: Quarterly Ladder Review
+
+on:
+  schedule:
+    # 03:17 UTC on the 1st of January, April, July, and October (Quarterly Kickoff, offset from top of hour)
+    - cron: '17 3 1 1,4,7,10 *'
+  workflow_dispatch:
+    inputs:
+      dry_run:
+        description: 'Dry run (do not file issues)'
+        type: boolean
+        default: false
+
+permissions: {}
+
+concurrency:
+  group: quarterly-review
+  cancel-in-progress: false
+
+jobs:
+  file_checklist:
+    name: File Quarterly Review Checklist Issue
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        with:
+          persist-credentials: false
+
+      - name: File Quarterly Review Checklist Issue for @Piinks
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          DRY_RUN: ${{ inputs.dry_run || false }}
+        run: |
+          QUARTER="Q$(( ($(date +%-m) - 1) / 3 + 1 )) $(date +%Y)"
+          QUARTER_SLUG="$(date +%Y)-Q$(( ($(date +%-m) - 1) / 3 + 1 ))"
+
+          cat <<EOF > checklist_body.md
+          # Quarterly Contributor Ladder Review Checklist (${QUARTER})
+
+          This issue tracks the facilitator tasks for the **${QUARTER}** Flutter Contributor Ladder review.
+          See [docs/QUARTERLY_REVIEW.md](docs/QUARTERLY_REVIEW.md) for full details.
+
+          ## Phase 1: Kickoff & Opening the Review PR (Day 1)
+
+          - [ ] **1. Run the audit locally & vet against the internal ban history list**
+            Pull the latest \`main\` branch (with daily synced activity data), create a branch for the quarterly review PR, and run:
+
+            \`\`\`bash
+            git checkout -b ${QUARTER_SLUG}-quarterly-review
+            dart run tool/quarterly_audit.dart --prepare
+            \`\`\`
+
+            - The tool lists all nominated promotions, returning Emeriti, and prospective external new joiners so you can manually check those usernames against the internal Code of Conduct / ban history list.
+            - Enter any ineligible usernames when prompted (or pass \`--exclude user1,user2\`) so they are excluded before any files are written and no one is singled out.
+            - This generates \`reports/${QUARTER_SLUG}-community-ladder-audit.md\` and \`reports/${QUARTER_SLUG}-partner-verification-audit.md\` and updates \`data/contributors.yaml\`, \`ROSTER.md\`, and \`EMERITUS.md\`.
+          - [ ] **2. Open the single Quarterly Review PR (do not merge until after 30-day grace period)**
+            Commit the generated reports and roster updates into a single PR:
+
+            \`\`\`bash
+            git add reports/ data/contributors.yaml ROSTER.md EMERITUS.md
+            git commit -m "chore: ${QUARTER} quarterly contributor ladder review"
+            \`\`\`
+
+            *(Hold this PR open throughout the 30-day review period.)*
+          - [ ] **3. Open the public Community Review & Partner Verification issues**
+            Use the tool to draft or open the two public tracking issues from your vetted reports to start the 30-day review period:
+
+            \`\`\`bash
+            # Preview drafted issues and gh commands:
+            dart run tool/quarterly_audit.dart --draft-issues --pr <PR_URL>
+
+            # Or open both issues directly via gh CLI:
+            dart run tool/quarterly_audit.dart --open-issues --pr <PR_URL>
+            \`\`\`
+
+          ## Phase 2: 30-Day Review Period (Days 1–30)
+
+          - [ ] **4. Monitor community responses & confirm partner members**
+            - Collect Discord usernames from newly invited contributors on the Community Audit issue.
+            - Review qualitative contributions that cannot be quantified automatically (triage, reproductions, [RFCs](https://github.com/flutter/rfc), mentoring).
+            - Reach out to partner teams to confirm active status for \`@flutter/partners\` members.
+            - *(The weekly \`.github/workflows/check_grace_period.yml\` workflow automatically posts a weekly countdown update on the open review issues during the 30-day window and pings the assignee once 30 days have elapsed.)*
+
+          ## Phase 3: Finalization & Provisioning (Day 30+)
+
+          - [ ] **5. Update the open PR with 30-day adjustments & land it**
+            On your \`${QUARTER_SLUG}-quarterly-review\` PR branch, run the tool with any adjustments from the 30-day window:
+
+            \`\`\`bash
+            dart run tool/quarterly_audit.dart --finalize \\
+              --retain user1,user2 \\
+              --exclude declined_or_excluded_user \\
+              --discord new_user=discord_handle
+            \`\`\`
+
+            Commit, push to the PR branch, and merge the PR.
+          - [ ] **6. Synchronize GitHub teams, Discord access & close issues**
+            - Update \`@flutter/reviewers\`, \`@flutter/committers\`, and \`@flutter/maintainers\` (child teams of \`@flutter/flutter-hackers\`, where \`@flutter/maintainers\` contains all members of \`@flutter/googlers\` and \`@flutter/partners\`) and \`@flutter/partners\` child teams to match \`ROSTER.md\` (\`@flutter/collaborators\` is automatically managed by internal tooling and is not updated manually).
+            - Remove members who transitioned to Dasher Emeritus from the \`flutter\` GitHub organization.
+            - Grant the Discord team member role to newly added ladder members using their collected Discord handles.
+            - Close the public review issues and this checklist issue.
+          EOF
+
+          if [ "$DRY_RUN" = "true" ]; then
+            echo "Dry run enabled. Would file checklist issue:"
+            cat checklist_body.md
+            exit 0
+          fi
+
+          gh label create "quarterly-review-checklist" --description "Quarterly Review Facilitator Checklist" --color "0052CC" --force || true
+
+          EXISTING_CHECKLIST=$(gh issue list --state all --label "quarterly-review-checklist" --search "${QUARTER}" --json number --jq '.[0].number')
+          if [ -z "$EXISTING_CHECKLIST" ]; then
+            CHECKLIST_URL=$(gh issue create \
+              --title "[Quarterly Review Checklist]: ${QUARTER} Contributor Ladder Audit" \
+              --body-file checklist_body.md \
+              --label "quarterly-review-checklist" \
+              --assignee "Piinks")
+            echo "Created Quarterly Review Checklist Issue: $CHECKLIST_URL"
+          else
+            echo "Quarterly Review Checklist Issue already exists (#$EXISTING_CHECKLIST)."
+          fi
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index e01b250..6716ecf 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -39,6 +39,12 @@ jobs:
       - name: Analyze Dart code
         run: dart analyze --fatal-infos
 
+      - name: Validate contributors.yaml
+        run: dart run tool/validate_roster.dart
+
+      - name: Verify ROSTER.md and EMERITUS.md are in sync
+        run: dart run tool/generate_roster.dart --check
+
       - name: Run unit test suite
         run: dart test
 
diff --git a/EMERITUS.md b/EMERITUS.md
new file mode 100644
index 0000000..9df292b
--- /dev/null
+++ b/EMERITUS.md
@@ -0,0 +1,68 @@
+# Dasher Emeritus
+
+> [!IMPORTANT]
+> **Pending Q4 Audit:** No contributor roles or organization memberships have been changed yet. The Emeritus transitions listed below are pending the Q4 audit, which will be subject to a 30-day community review period before being finalized.
+
+This directory honors **Dasher Emeritus** alumni—former Flutter Reviewers, Committers, and Maintainers who previously held roles on the contributor ladder and have stepped back from active contribution (< 10 contributions over the preceding 12 months).
+
+To maintain repository security, Dasher Emeriti do not remain members of the `flutter` GitHub organization. Instead, their contributions are recognized here, and they retain access to Flutter contributor channels on Discord (including `#hidden-chat`) and the announcement-only `flutter-contributors` Google Group (for project announcements and calendar invites to our recurring Flutter Contributor Roundtable and the Dash Forum, where contributors can present and get feedback on their [RFCs](https://github.com/flutter/rfc); the registration form is pinned in `#hidden-chat` on Discord) so they can stay in touch and more easily ramp back up onto the project if and when they choose to return.
+
+Returning Emeriti who resume contributing are automatically identified during quarterly reviews (where they can reply directly on the public tracking issue). For off-cycle reinstatement, because creating new issues and pull requests in `flutter/contributors` is restricted to organization members (`collaborators`), returning Emeriti can reach out in `#hidden-chat` on Discord (or to an active organization member) to have an active org member sponsor and open a [Dasher Emeritus Reinstatement request](.github/ISSUE_TEMPLATE/2_emeritus_reinstatement.yml) on their behalf (where they can also share an updated Discord username if needed). See [docs/LADDER.md](docs/LADDER.md) for details.
+
+> [!NOTE]
+> This file is automatically generated from `data/contributors.yaml`.
+> To update, edit `data/contributors.yaml` and run `dart run tool/generate_roster.dart`.
+
+## Honored Alumni
+
+[@0xZOne](https://github.com/0xZOne) • [@324mao](https://github.com/324mao) • [@a14n](https://github.com/a14n) • [@aaron-sf](https://github.com/aaron-sf)
+[@adarshprabhu](https://github.com/adarshprabhu) • [@adicahyono](https://github.com/adicahyono) • [@akrwb](https://github.com/akrwb) • [@albertodev01](https://github.com/albertodev01)
+[@alestiago](https://github.com/alestiago) • [@allisonryan0002](https://github.com/allisonryan0002) • [@almasryalyoum](https://github.com/almasryalyoum) • [@alxp1982](https://github.com/alxp1982)
+[@anderdobo](https://github.com/anderdobo) • [@AnnaPS](https://github.com/AnnaPS) • [@antonellof](https://github.com/antonellof) • [@ANTONINEUTRON](https://github.com/ANTONINEUTRON)
+[@AntonyKiragu](https://github.com/AntonyKiragu) • [@atrope](https://github.com/atrope) • [@AustinGTI](https://github.com/AustinGTI) • [@AyushBherwani1998](https://github.com/AyushBherwani1998)
+[@azchohfi](https://github.com/azchohfi) • [@bartekpacia](https://github.com/bartekpacia) • [@BerkSpar](https://github.com/BerkSpar) • [@bernaferrari](https://github.com/bernaferrari)
+[@brianegan](https://github.com/brianegan) • [@bruno-garcia](https://github.com/bruno-garcia) • [@bselwe](https://github.com/bselwe) • [@btobin](https://github.com/btobin)
+[@budikhafiKLY](https://github.com/budikhafiKLY) • [@burakkasikci](https://github.com/burakkasikci) • [@CareF](https://github.com/CareF) • [@chenglu](https://github.com/chenglu)
+[@chinmoy12c](https://github.com/chinmoy12c) • [@chriscraws](https://github.com/chriscraws) • [@chrisraygill](https://github.com/chrisraygill) • [@cityxsuperapp](https://github.com/cityxsuperapp)
+[@CoffeeDevUK](https://github.com/CoffeeDevUK) • [@ColdPaleLight](https://github.com/ColdPaleLight) • [@collinjackson](https://github.com/collinjackson) • [@dam-ease](https://github.com/dam-ease)
+[@darshankawar](https://github.com/darshankawar) • [@DBowen33](https://github.com/DBowen33) • [@dclark-disney](https://github.com/dclark-disney) • [@diarmaidlindsay](https://github.com/diarmaidlindsay)
+[@DiegoGW](https://github.com/DiegoGW) • [@diegoveloper](https://github.com/diegoveloper) • [@djol](https://github.com/djol) • [@dominikIncibit](https://github.com/dominikIncibit)
+[@eda-nagao](https://github.com/eda-nagao) • [@eggfly](https://github.com/eggfly) • [@egoe](https://github.com/egoe) • [@Ehesp](https://github.com/Ehesp)
+[@eieio](https://github.com/eieio) • [@emma-roudabush-disney](https://github.com/emma-roudabush-disney) • [@emrebuyukozkan](https://github.com/emrebuyukozkan) • [@ened](https://github.com/ened)
+[@enzoftware](https://github.com/enzoftware) • [@erickzanardo](https://github.com/erickzanardo) • [@eseidel](https://github.com/eseidel) • [@exaby73](https://github.com/exaby73)
+[@farshad1489](https://github.com/farshad1489) • [@felangel](https://github.com/felangel) • [@filiph](https://github.com/filiph) • [@FirentisTFW](https://github.com/FirentisTFW)
+[@FlutterIssues](https://github.com/FlutterIssues) • [@fma-goog](https://github.com/fma-goog) • [@FXschwartz](https://github.com/FXschwartz) • [@gastonliz](https://github.com/gastonliz)
+[@gianfrancopapa](https://github.com/gianfrancopapa) • [@gnprice](https://github.com/gnprice) • [@guoguo338](https://github.com/guoguo338) • [@h9jiang](https://github.com/h9jiang)
+[@hamdikahloun](https://github.com/hamdikahloun) • [@harri35](https://github.com/harri35) • [@hbatagelo](https://github.com/hbatagelo) • [@helinanever](https://github.com/helinanever)
+[@hgraceb](https://github.com/hgraceb) • [@HidenoriMatsubayashi](https://github.com/HidenoriMatsubayashi) • [@hillelcoren](https://github.com/hillelcoren) • [@Hiroaki-Kanai](https://github.com/Hiroaki-Kanai)
+[@horiaciu](https://github.com/horiaciu) • [@IanSimpson](https://github.com/IanSimpson) • [@ihorkozar](https://github.com/ihorkozar) • [@irmasantoso](https://github.com/irmasantoso)
+[@itsjen](https://github.com/itsjen) • [@ja-dfir](https://github.com/ja-dfir) • [@Jan-Stepien](https://github.com/Jan-Stepien) • [@jcollins-disney](https://github.com/jcollins-disney)
+[@JErazo7](https://github.com/JErazo7) • [@jeroen-meijer](https://github.com/jeroen-meijer) • [@jesskuras](https://github.com/jesskuras) • [@jingshao-code](https://github.com/jingshao-code)
+[@jnschulze](https://github.com/jnschulze) • [@jomblocoder](https://github.com/jomblocoder) • [@jorgecoca](https://github.com/jorgecoca) • [@josemontespg](https://github.com/josemontespg)
+[@jpnurmi](https://github.com/jpnurmi) • [@JsouLiang](https://github.com/JsouLiang) • [@Justian-SopraSteria](https://github.com/Justian-SopraSteria) • [@jwinarske](https://github.com/jwinarske)
+[@kaiceyd](https://github.com/kaiceyd) • [@kenvandine](https://github.com/kenvandine) • [@kevinburns426](https://github.com/kevinburns426) • [@kevya-google](https://github.com/kevya-google)
+[@kinla004](https://github.com/kinla004) • [@Kirpal](https://github.com/Kirpal) • [@kkboateng](https://github.com/kkboateng) • [@kmillikin](https://github.com/kmillikin)
+[@kokoro-team](https://github.com/kokoro-team) • [@kondoakio](https://github.com/kondoakio) • [@KristinBi](https://github.com/KristinBi) • [@kwg4](https://github.com/kwg4)
+[@laramartin](https://github.com/laramartin) • [@leoafarias](https://github.com/leoafarias) • [@linxuebin1990](https://github.com/linxuebin1990) • [@LinXunFeng](https://github.com/LinXunFeng)
+[@lucavenir](https://github.com/lucavenir) • [@luckysmg](https://github.com/luckysmg) • [@MacarenaSantos](https://github.com/MacarenaSantos) • [@magicianA](https://github.com/magicianA)
+[@maheshj01](https://github.com/maheshj01) • [@Markzipan](https://github.com/Markzipan) • [@martinduva](https://github.com/martinduva) • [@MaruQuarky](https://github.com/MaruQuarky)
+[@marwfair](https://github.com/marwfair) • [@matiasleyba](https://github.com/matiasleyba) • [@matsuda-shota](https://github.com/matsuda-shota) • [@matthew-carroll](https://github.com/matthew-carroll)
+[@matthewshahi](https://github.com/matthewshahi) • [@mattmartelnz](https://github.com/mattmartelnz) • [@MauriPastorini](https://github.com/MauriPastorini) • [@maxp89](https://github.com/maxp89)
+[@mchudy](https://github.com/mchudy) • [@Menshoz](https://github.com/Menshoz) • [@mhadaily](https://github.com/mhadaily) • [@michaelkedar](https://github.com/michaelkedar)
+[@milezabaleta](https://github.com/milezabaleta) • [@miquelbeltran](https://github.com/miquelbeltran) • [@moffatman](https://github.com/moffatman) • [@MrUnfunny](https://github.com/MrUnfunny)
+[@msangalli](https://github.com/msangalli) • [@MuthuGCodes](https://github.com/MuthuGCodes) • [@mvanbeusekom](https://github.com/mvanbeusekom) • [@nikosportolos](https://github.com/nikosportolos)
+[@nirunirosha401-personal](https://github.com/nirunirosha401-personal) • [@noboru-i](https://github.com/noboru-i) • [@nt4f04uNd](https://github.com/nt4f04uNd) • [@okursoftware](https://github.com/okursoftware)
+[@omartinma](https://github.com/omartinma) • [@omatt](https://github.com/omatt) • [@pedromassango](https://github.com/pedromassango) • [@pingbird](https://github.com/pingbird)
+[@PoojaB26](https://github.com/PoojaB26) • [@QMAshfaqAli](https://github.com/QMAshfaqAli) • [@rahulan](https://github.com/rahulan) • [@rajayogan](https://github.com/rajayogan)
+[@renefloor](https://github.com/renefloor) • [@Rexios80](https://github.com/Rexios80) • [@rzambroni](https://github.com/rzambroni) • [@Salakar](https://github.com/Salakar)
+[@scarletteliza](https://github.com/scarletteliza) • [@scutlight](https://github.com/scutlight) • [@SenseiMinimal](https://github.com/SenseiMinimal) • [@shirbayat](https://github.com/shirbayat)
+[@simpson-peter](https://github.com/simpson-peter) • [@slightfoot](https://github.com/slightfoot) • [@snikiche](https://github.com/snikiche) • [@SofiaRey](https://github.com/SofiaRey)
+[@spideythewebhead](https://github.com/spideythewebhead) • [@spjass](https://github.com/spjass) • [@spratt-disney](https://github.com/spratt-disney) • [@ssmitienko](https://github.com/ssmitienko)
+[@sushanthmshetty](https://github.com/sushanthmshetty) • [@swavkulinski](https://github.com/swavkulinski) • [@Swiftaxe](https://github.com/Swiftaxe) • [@tanercc](https://github.com/tanercc)
+[@tcannon-disney](https://github.com/tcannon-disney) • [@tfabacher-dp](https://github.com/tfabacher-dp) • [@tgucio](https://github.com/tgucio) • [@thekorn](https://github.com/thekorn)
+[@thkim1011](https://github.com/thkim1011) • [@TimoPieti](https://github.com/TimoPieti) • [@tomgilder](https://github.com/tomgilder) • [@tpiaggio](https://github.com/tpiaggio)
+[@trevorplant](https://github.com/trevorplant) • [@tsurumotokdi](https://github.com/tsurumotokdi) • [@udayon](https://github.com/udayon) • [@vaind](https://github.com/vaind)
+[@valentinallavayol](https://github.com/valentinallavayol) • [@Vanethos](https://github.com/Vanethos) • [@wakita181009](https://github.com/wakita181009) • [@wangying3426](https://github.com/wangying3426)
+[@werainkhatri](https://github.com/werainkhatri) • [@whesse](https://github.com/whesse) • [@wolfenrain](https://github.com/wolfenrain) • [@workerbee22](https://github.com/workerbee22)
+[@wprater](https://github.com/wprater) • [@xm0128](https://github.com/xm0128) • [@xu-baolin](https://github.com/xu-baolin) • [@YeungKC](https://github.com/YeungKC)
+[@yiiim](https://github.com/yiiim) • [@ymgn-dev](https://github.com/ymgn-dev) • [@zhongwuzw](https://github.com/zhongwuzw) • [@Zudah228](https://github.com/Zudah228)
diff --git a/ROSTER.md b/ROSTER.md
new file mode 100644
index 0000000..0689b98
--- /dev/null
+++ b/ROSTER.md
@@ -0,0 +1,104 @@
+# Contributor Roster
+
+> [!IMPORTANT]
+> **Pending Q4 Audit:** No contributor roles or permissions have been changed yet. The placements listed below are initial baseline assignments pending the Q4 audit, which will be subject to a 30-day community review period before being finalized.
+
+This directory lists active Flutter Contributor Ladder members.
+Honorary alumni who have stepped back from active contribution and exited the GitHub organization are listed in [EMERITUS.md](EMERITUS.md).
+Governance details and tier qualifications are specified in [docs/LADDER.md](docs/LADDER.md).
+
+> [!NOTE]
+> This file is automatically generated from `data/contributors.yaml`.
+> To update, edit `data/contributors.yaml` and run `dart run tool/generate_roster.dart`.
+
+## Maintainers (`@flutter/maintainers`)
+
+Maintainers hold GitHub Write permissions and organization moderation privileges, and belong to `@flutter/maintainers` (a child team of `@flutter/flutter-hackers`).
+
+[@aam](https://github.com/aam) • [@abdallahshaban557](https://github.com/abdallahshaban557) • [@alexmarkov](https://github.com/alexmarkov) • [@amcasari](https://github.com/amcasari)
+[@ananci](https://github.com/ananci) • [@andrewkolos](https://github.com/andrewkolos) • [@andywolff](https://github.com/andywolff) • [@another-rex](https://github.com/another-rex)
+[@antfitch](https://github.com/antfitch) • [@apwilson](https://github.com/apwilson) • [@arbreng](https://github.com/arbreng) • [@athomas](https://github.com/athomas)
+[@b-luk](https://github.com/b-luk) • [@bdero](https://github.com/bdero) • [@biggs0125](https://github.com/biggs0125) • [@bkonyi](https://github.com/bkonyi)
+[@bparrishMines](https://github.com/bparrishMines) • [@brianquinlan](https://github.com/brianquinlan) • [@bwilkerson](https://github.com/bwilkerson) • [@camsim99](https://github.com/camsim99)
+[@CarlosMendonca](https://github.com/CarlosMendonca) • [@caroqliu](https://github.com/caroqliu) • [@catharp](https://github.com/catharp) • [@cbracken](https://github.com/cbracken)
+[@chandarrengoog](https://github.com/chandarrengoog) • [@chaselatta](https://github.com/chaselatta) • [@chingjun](https://github.com/chingjun) • [@chloestefantsova](https://github.com/chloestefantsova)
+[@ChristianEdwardPadilla](https://github.com/ChristianEdwardPadilla) • [@chunhtai](https://github.com/chunhtai) • [@cj-radcliff](https://github.com/cj-radcliff) • [@cligh](https://github.com/cligh)
+[@conooi](https://github.com/conooi) • [@cpsloal](https://github.com/cpsloal) • [@craiglabenz](https://github.com/craiglabenz) • [@DanTup](https://github.com/DanTup)
+[@danxorzum](https://github.com/danxorzum) • [@dcharkes](https://github.com/dcharkes) • [@di](https://github.com/di) • [@ditman](https://github.com/ditman)
+[@dkbharti-glitch](https://github.com/dkbharti-glitch) • [@dkwingsmt](https://github.com/dkwingsmt) • [@domesticmouse](https://github.com/domesticmouse) • [@dsmcl](https://github.com/dsmcl)
+[@dustingreen](https://github.com/dustingreen) • [@elliette](https://github.com/elliette) • [@emckean](https://github.com/emckean) • [@ericwindmill](https://github.com/ericwindmill)
+[@essjay05](https://github.com/essjay05) • [@everyplace](https://github.com/everyplace) • [@eyebrowsoffire](https://github.com/eyebrowsoffire) • [@flar](https://github.com/flar)
+[@flutter-zl](https://github.com/flutter-zl) • [@gaaclarke](https://github.com/gaaclarke) • [@GemmaJAy](https://github.com/GemmaJAy) • [@gitrey](https://github.com/gitrey)
+[@gmackall](https://github.com/gmackall) • [@goderbauer](https://github.com/goderbauer) • [@grouma](https://github.com/grouma) • [@gspencergoog](https://github.com/gspencergoog)
+[@guidezpl](https://github.com/guidezpl) • [@hannah-hyj](https://github.com/hannah-hyj) • [@harryterkelsen](https://github.com/harryterkelsen) • [@helin24](https://github.com/helin24)
+[@hellohuanlin](https://github.com/hellohuanlin) • [@Hixie](https://github.com/Hixie) • [@ievdokdm](https://github.com/ievdokdm) • [@iinozemtsev](https://github.com/iinozemtsev)
+[@inferno-chromium](https://github.com/inferno-chromium) • [@InMatrix](https://github.com/InMatrix) • [@itsjustkevin](https://github.com/itsjustkevin) • [@jacob314](https://github.com/jacob314)
+[@jacobsimionato](https://github.com/jacobsimionato) • [@jaeheon](https://github.com/jaeheon) • [@jakemac53](https://github.com/jakemac53) • [@jalseth](https://github.com/jalseth)
+[@jason-simmons](https://github.com/jason-simmons) • [@jensjoha](https://github.com/jensjoha) • [@jesswrd](https://github.com/jesswrd) • [@jfschmakeit](https://github.com/jfschmakeit)
+[@jiahaog](https://github.com/jiahaog) • [@jmagman](https://github.com/jmagman) • [@joefspiro](https://github.com/joefspiro) • [@johnmccutchan](https://github.com/johnmccutchan)
+[@johnniwinther](https://github.com/johnniwinther) • [@johnpryan](https://github.com/johnpryan) • [@johnsonmh](https://github.com/johnsonmh) • [@jokerttu](https://github.com/jokerttu)
+[@jonasfj](https://github.com/jonasfj) • [@jonathanmetzman](https://github.com/jonathanmetzman) • [@joshualitt](https://github.com/joshualitt) • [@jq129398](https://github.com/jq129398)
+[@jrwang](https://github.com/jrwang) • [@jtmcdole](https://github.com/jtmcdole) • [@juan-mora-google](https://github.com/juan-mora-google) • [@justinmc](https://github.com/justinmc)
+[@jwill](https://github.com/jwill) • [@jwren](https://github.com/jwren) • [@jyameo](https://github.com/jyameo) • [@kallentu](https://github.com/kallentu)
+[@keertip](https://github.com/keertip) • [@kenzieschmoll](https://github.com/kenzieschmoll) • [@kevmoo](https://github.com/kevmoo) • [@khanhnwin](https://github.com/khanhnwin)
+[@kjlubick](https://github.com/kjlubick) • [@knopp](https://github.com/knopp) • [@lamek](https://github.com/lamek) • [@leafpetersen](https://github.com/leafpetersen)
+[@liamappelbe](https://github.com/liamappelbe) • [@loic-sharma](https://github.com/loic-sharma) • [@LongCatIsLooong](https://github.com/LongCatIsLooong) • [@LouiseHsu](https://github.com/LouiseHsu)
+[@mariamhas](https://github.com/mariamhas) • [@MaryaBelanger](https://github.com/MaryaBelanger) • [@maryx](https://github.com/maryx) • [@mattkae](https://github.com/mattkae)
+[@mbcorona](https://github.com/mbcorona) • [@mboetger](https://github.com/mboetger) • [@mbrase](https://github.com/mbrase) • [@mdebbar](https://github.com/mdebbar)
+[@miguelfrde](https://github.com/miguelfrde) • [@mikaelkomu](https://github.com/mikaelkomu) • [@mit-mit](https://github.com/mit-mit) • [@mkustermann](https://github.com/mkustermann)
+[@mosuem](https://github.com/mosuem) • [@mraleph](https://github.com/mraleph) • [@munificent](https://github.com/munificent) • [@muralikrishmt](https://github.com/muralikrishmt)
+[@nan-yu](https://github.com/nan-yu) • [@natebosch](https://github.com/natebosch) • [@nickyringland](https://github.com/nickyringland) • [@nshahan](https://github.com/nshahan)
+[@nuritzi](https://github.com/nuritzi) • [@okorohelijah](https://github.com/okorohelijah) • [@oliverchang](https://github.com/oliverchang) • [@omerlevran46](https://github.com/omerlevran46)
+[@parlough](https://github.com/parlough) • [@paul-geoghegan](https://github.com/paul-geoghegan) • [@peixinli](https://github.com/peixinli) • [@pennzht](https://github.com/pennzht)
+[@Piinks](https://github.com/Piinks) • [@polina-c](https://github.com/polina-c) • [@pq](https://github.com/pq) • [@precision](https://github.com/precision)
+[@preethi0228-git](https://github.com/preethi0228-git) • [@puneetkukreja98](https://github.com/puneetkukreja98) • [@QuncCccccc](https://github.com/QuncCccccc) • [@ranbeuer](https://github.com/ranbeuer)
+[@redbrogdon](https://github.com/redbrogdon) • [@reidbaker](https://github.com/reidbaker) • [@renaudd](https://github.com/renaudd) • [@renyou](https://github.com/renyou)
+[@Renzo-Olivares](https://github.com/Renzo-Olivares) • [@rmacnak-google](https://github.com/rmacnak-google) • [@robert-ancell](https://github.com/robert-ancell) • [@rodydavis](https://github.com/rodydavis)
+[@rspier](https://github.com/rspier) • [@Rusino](https://github.com/Rusino) • [@samuli-codemate](https://github.com/samuli-codemate) • [@saurabh-mirajkar](https://github.com/saurabh-mirajkar)
+[@Saviq](https://github.com/Saviq) • [@scheglov](https://github.com/scheglov) • [@schultek](https://github.com/schultek) • [@sethladd](https://github.com/sethladd)
+[@sfshaza2](https://github.com/sfshaza2) • [@sgnagnarella](https://github.com/sgnagnarella) • [@shanecglass](https://github.com/shanecglass) • [@sigmundch](https://github.com/sigmundch)
+[@sigurdm](https://github.com/sigurdm) • [@sokoloff06](https://github.com/sokoloff06) • [@srawlins](https://github.com/srawlins) • [@srujzs](https://github.com/srujzs)
+[@sstrickl](https://github.com/sstrickl) • [@stef-luo](https://github.com/stef-luo) • [@stereotype441](https://github.com/stereotype441) • [@stevemessick](https://github.com/stevemessick)
+[@stuartmorgan-g](https://github.com/stuartmorgan-g) • [@studgeek](https://github.com/studgeek) • [@suertreus](https://github.com/suertreus) • [@suryaKommana2662](https://github.com/suryaKommana2662)
+[@szakarias](https://github.com/szakarias) • [@tarobins](https://github.com/tarobins) • [@tarrinneal](https://github.com/tarrinneal) • [@tasnim-khan](https://github.com/tasnim-khan)
+[@thagomizer](https://github.com/thagomizer) • [@timothyhoang-google](https://github.com/timothyhoang-google) • [@twerske](https://github.com/twerske) • [@utopicnarwhal](https://github.com/utopicnarwhal)
+[@uysalere](https://github.com/uysalere) • [@vashworth](https://github.com/vashworth) • [@victorsanni](https://github.com/victorsanni) • [@vivahome2](https://github.com/vivahome2)
+[@vsmenon](https://github.com/vsmenon) • [@walley892](https://github.com/walley892) • [@xster](https://github.com/xster) • [@yjbanov](https://github.com/yjbanov)
+[@zanderso](https://github.com/zanderso) • [@zhenqiu1101](https://github.com/zhenqiu1101) • [@zijiehe-google-com](https://github.com/zijiehe-google-com) • [@zoeyfan](https://github.com/zoeyfan)
+
+## Committers (`@flutter/committers`)
+
+Committers hold GitHub Write permissions (merge rights) and provide authoritative code reviews.
+
+| Contributor | GitHub profile | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- |
+| @AbdeMohlbi | [github.com/AbdeMohlbi](https://github.com/AbdeMohlbi) | 143 | 241 |
+| @ValentinVignal | [github.com/ValentinVignal](https://github.com/ValentinVignal) | 30 | 47 |
+| @bleroux | [github.com/bleroux](https://github.com/bleroux) | 20 | 31 |
+| @davidhicks980 | [github.com/davidhicks980](https://github.com/davidhicks980) | 12 | 25 |
+| @huycozy | [github.com/huycozy](https://github.com/huycozy) | 11 | 33 |
+| @ksokolovskyi | [github.com/ksokolovskyi](https://github.com/ksokolovskyi) | 23 | 36 |
+| @navaronbracke | [github.com/navaronbracke](https://github.com/navaronbracke) | 43 | 333 |
+| @rkishan516 | [github.com/rkishan516](https://github.com/rkishan516) | 51 | 77 |
+| @vickyduran | [github.com/vickyduran](https://github.com/vickyduran) | - | - |
+
+## Reviewers (`@flutter/reviewers`)
+
+Reviewers hold GitHub Triage permissions, triage issues, and conduct first-pass code reviews.
+
+| Contributor | GitHub profile | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- |
+| @AlexV525 | [github.com/AlexV525](https://github.com/AlexV525) | 3 | 6 |
+| @Hari-07 | [github.com/Hari-07](https://github.com/Hari-07) | 9 | 30 |
+| @Jhon-Aires | [github.com/Jhon-Aires](https://github.com/Jhon-Aires) | - | - |
+| @RobertOdrowaz | [github.com/RobertOdrowaz](https://github.com/RobertOdrowaz) | 7 | 12 |
+| @csells | [github.com/csells](https://github.com/csells) | 11 | 22 |
+| @danagbemava-nc | [github.com/danagbemava-nc](https://github.com/danagbemava-nc) | 0 | 8 |
+| @htrolle-epam | [github.com/htrolle-epam](https://github.com/htrolle-epam) | 15 | 15 |
+| @kentnguyen99 | [github.com/kentnguyen99](https://github.com/kentnguyen99) | 0 | 542 |
+| @piedcipher | [github.com/piedcipher](https://github.com/piedcipher) | 7 | 16 |
+| @tirth-patel-nc | [github.com/tirth-patel-nc](https://github.com/tirth-patel-nc) | 0 | 10 |
+
+## Dasher Emeritus
+
+Former ladder members who have stepped back from active contribution do not remain in the GitHub organization and are honored in [EMERITUS.md](EMERITUS.md).
diff --git a/data/contributors.yaml b/data/contributors.yaml
new file mode 100644
index 0000000..fb3be21
--- /dev/null
+++ b/data/contributors.yaml
@@ -0,0 +1,891 @@
+# Flutter Contributor Ladder Roster
+# Source of truth for Flutter contributor roles and permissions.
+# Last updated: 2026-07-30
+
+maintainers:
+  # Maintainers on the Flutter team (@flutter/googlers and @flutter/partners)
+  # Granted Write access + Org Moderation
+  googlers:
+    - username: CarlosMendonca
+      role: maintainer
+    - username: ChristianEdwardPadilla
+      role: maintainer
+    - username: GemmaJAy
+      role: maintainer
+    - username: InMatrix
+      role: maintainer
+    - username: LongCatIsLooong
+      role: maintainer
+    - username: LouiseHsu
+      role: maintainer
+    - username: MaryaBelanger
+      role: maintainer
+    - username: Piinks
+      role: maintainer
+    - username: QuncCccccc
+      role: maintainer
+    - username: Renzo-Olivares
+      role: maintainer
+    - username: Rusino
+      role: maintainer
+    - username: aam
+      role: maintainer
+    - username: abdallahshaban557
+      role: maintainer
+    - username: alexmarkov
+      role: maintainer
+    - username: amcasari
+      role: maintainer
+    - username: ananci
+      role: maintainer
+    - username: andrewkolos
+      role: maintainer
+    - username: andywolff
+      role: maintainer
+    - username: another-rex
+      role: maintainer
+    - username: antfitch
+      role: maintainer
+    - username: apwilson
+      role: maintainer
+    - username: arbreng
+      role: maintainer
+    - username: athomas
+      role: maintainer
+    - username: b-luk
+      role: maintainer
+    - username: biggs0125
+      role: maintainer
+    - username: bkonyi
+      role: maintainer
+    - username: bparrishMines
+      role: maintainer
+    - username: brianquinlan
+      role: maintainer
+    - username: bwilkerson
+      role: maintainer
+    - username: camsim99
+      role: maintainer
+    - username: caroqliu
+      role: maintainer
+    - username: catharp
+      role: maintainer
+    - username: cbracken
+      role: maintainer
+    - username: chandarrengoog
+      role: maintainer
+    - username: chaselatta
+      role: maintainer
+    - username: chingjun
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+  partners:
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+      team: "@flutter/partners"
+      role: maintainer
+    - username: Hixie
+      team: "@flutter/partners"
+      role: maintainer
+    - username: Saviq
+      team: "@flutter/canonical"
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+      role: maintainer
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+      role: maintainer
+    - username: utopicnarwhal
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+
+committers:
+  # Members of @flutter/committers (Child of @flutter/flutter-hackers)
+  # Granted GitHub Write role / merge access
+  - username: AbdeMohlbi
+    role: committer
+  - username: ValentinVignal
+    role: committer
+  - username: bleroux
+    role: committer
+  - username: davidhicks980
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+    role: committer
+  - username: rkishan516
+    role: committer
+  - username: vickyduran
+    role: committer
+
+reviewers:
+  # Members of @flutter/reviewers (Child of @flutter/flutter-hackers)
+  # Granted GitHub Triage role
+  - username: AlexV525
+    role: reviewer
+  - username: Hari-07
+    role: reviewer
+  - username: Jhon-Aires
+    role: reviewer
+  - username: RobertOdrowaz
+    role: reviewer
+  - username: csells
+    role: reviewer
+  - username: danagbemava-nc
+    role: reviewer
+  - username: htrolle-epam
+    grace_until: "2027-10-14"
+    role: reviewer
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+    role: reviewer
+  - username: piedcipher
+    role: reviewer
+  - username: tirth-patel-nc
+    role: reviewer
+
+dash_emeritus:
+  # Honored alumni (External, non-org members on GitHub)
+  - username: 0xZOne
+    role: emeritus
+  - username: 324mao
+    role: emeritus
+  - username: ANTONINEUTRON
+    role: emeritus
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+    role: emeritus
+  - username: AntonyKiragu
+    role: emeritus
+  - username: AustinGTI
+    role: emeritus
+  - username: AyushBherwani1998
+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
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+    role: emeritus
+  - username: valentinallavayol
+    role: emeritus
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+    role: emeritus
+  - username: wangying3426
+    role: emeritus
+  - username: werainkhatri
+    role: emeritus
+  - username: whesse
+    role: emeritus
+  - username: wolfenrain
+    role: emeritus
+  - username: workerbee22
+    role: emeritus
+  - username: wprater
+    role: emeritus
+  - username: xm0128
+    role: emeritus
+  - username: xu-baolin
+    role: emeritus
+  - username: yiiim
+    role: emeritus
+  - username: ymgn-dev
+    role: emeritus
+  - username: zhongwuzw
+    role: emeritus
diff --git a/test/activity_sync_test.dart b/test/activity_sync_test.dart
index 57b3358..4a960d0 100644
--- a/test/activity_sync_test.dart
+++ b/test/activity_sync_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
+// Copyright 2026 The Flutter Authors.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
diff --git a/test/bots_test.dart b/test/bots_test.dart
index c44649c..c0342de 100644
--- a/test/bots_test.dart
+++ b/test/bots_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
+// Copyright 2026 The Flutter Authors.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
diff --git a/test/data_integrity_test.dart b/test/data_integrity_test.dart
index d19ea33..34dfc66 100644
--- a/test/data_integrity_test.dart
+++ b/test/data_integrity_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
+// Copyright 2026 The Flutter Authors.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
diff --git a/test/github_client_test.dart b/test/github_client_test.dart
index 2d35514..9cdf68f 100644
--- a/test/github_client_test.dart
+++ b/test/github_client_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
+// Copyright 2026 The Flutter Authors.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
diff --git a/test/iso_week_test.dart b/test/iso_week_test.dart
index c9282f2..e2b9fcd 100644
--- a/test/iso_week_test.dart
+++ b/test/iso_week_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
+// Copyright 2026 The Flutter Authors.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
diff --git a/test/license_test.dart b/test/license_test.dart
index 7d67e0e..a54b201 100644
--- a/test/license_test.dart
+++ b/test/license_test.dart
@@ -1,4 +1,4 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
+// Copyright 2026 The Flutter Authors.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -7,7 +7,7 @@ import 'package:test/test.dart';
 
 String _generateLicense(String prefix) {
   return '''
-${prefix}Copyright 2014 The Flutter Authors. All rights reserved.
+${prefix}Copyright 2026 The Flutter Authors.
 ${prefix}Use of this source code is governed by a BSD-style license that can be
 ${prefix}found in the LICENSE file.''';
 }
diff --git a/test/mock_process_runner.dart b/test/mock_process_runner.dart
new file mode 100644
index 0000000..01bb510
--- /dev/null
+++ b/test/mock_process_runner.dart
@@ -0,0 +1,45 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+
+import '../tool/process_runner.dart';
+
+export '../tool/process_runner.dart' show ProcessRunner;
+
+/// In-memory mock process runner to record external process invocations and
+/// control process outputs hermetically in tests.
+class MockProcessRunner {
+  MockProcessRunner({
+    this.exitCode = 0,
+    this.stdout = '',
+    this.stderr = '',
+    this.exceptionToThrow,
+    this.handler,
+  });
+
+  final List<({String executable, List<String> arguments})> calls = [];
+  ProcessRunner? handler;
+  int exitCode;
+  dynamic stdout;
+  dynamic stderr;
+  Exception? exceptionToThrow;
+
+  Future<ProcessResult> run(String executable, List<String> arguments) async {
+    calls.add((
+      executable: executable,
+      arguments: List.unmodifiable(arguments),
+    ));
+    if (exceptionToThrow != null) {
+      throw exceptionToThrow!;
+    }
+    if (handler != null) {
+      return handler!(executable, arguments);
+    }
+    return ProcessResult(1234, exitCode, stdout, stderr);
+  }
+
+  Future<ProcessResult> call(String executable, List<String> arguments) =>
+      run(executable, arguments);
+}
diff --git a/test/quarterly_audit_test.dart b/test/quarterly_audit_test.dart
new file mode 100644
index 0000000..af87c37
--- /dev/null
+++ b/test/quarterly_audit_test.dart
@@ -0,0 +1,899 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:test/test.dart';
+
+import '../tool/check_grace_period.dart';
+import '../tool/check_user.dart';
+import '../tool/contributors_roster.dart';
+import '../tool/quarterly_audit.dart';
+import 'mock_process_runner.dart';
+
+void main() {
+  group('Quarterly Audit Report Generation', () {
+    test('generate community audit report runs and produces valid markdown',
+        () {
+      final result = Process.runSync('dart', [
+        'run',
+        'tool/quarterly_audit.dart',
+        '--community',
+        '--offline',
+      ]);
+
+      expect(
+        result.exitCode,
+        equals(0),
+        reason: 'quarterly_audit.dart --community should exit with 0',
+      );
+      final output = result.stdout as String;
+
+      // Header and metadata
+      expect(
+        output,
+        contains('# Quarterly Community Contributor Ladder Audit'),
+      );
+      expect(output, contains('Audit date:'));
+      expect(output, contains('12-month evaluation window:'));
+      expect(output, contains('30-day grace period deadline:'));
+
+      // Section 1: Promotions and New Joiners
+      expect(output, contains('## Recommended promotions and new joiners'));
+
+      // Section 2: Active Role Retention
+      expect(output, contains('## Active role retention'));
+
+      // Section 3: 30-Day Grace Period
+      expect(output, contains('## 30-day grace period'));
+
+      // Section 4: Callout for Unscripted Contributions
+      expect(output, contains('## Qualitative contributions'));
+    });
+
+    test(
+        'generate partner verification report runs and produces valid markdown',
+        () {
+      final result = Process.runSync('dart', [
+        'run',
+        'tool/quarterly_audit.dart',
+        '--partners',
+        '--offline',
+      ]);
+
+      expect(
+        result.exitCode,
+        equals(0),
+        reason: 'quarterly_audit.dart --partners should exit with 0',
+      );
+      final output = result.stdout as String;
+
+      // Header and metadata
+      expect(output, contains('# Quarterly Partner Team Verification Audit'));
+      expect(output, contains('@flutter/partners'));
+      expect(output, contains('## Active partner team members'));
+      expect(output, contains('## Departures and offboarding'));
+      expect(output, contains('[ ] Verified Active'));
+    });
+
+    test('ROSTER.md and EMERITUS.md exist and contain valid sections', () {
+      final rosterFile = File('ROSTER.md');
+      final emeritusFile = File('EMERITUS.md');
+      expect(rosterFile.existsSync(), isTrue);
+      expect(emeritusFile.existsSync(), isTrue);
+      expect(rosterFile.readAsStringSync(), contains('# Contributor Roster'));
+      expect(emeritusFile.readAsStringSync(), contains('# Dasher Emeritus'));
+    });
+
+    test(
+        'discovers external candidates from summary and applies --finalize transitions',
+        () {
+      final tempDir = Directory.systemTemp.createTempSync('audit_finalize_');
+      try {
+        final contributorsFile = File('${tempDir.path}/contributors.yaml');
+        final summaryFile = File('${tempDir.path}/activity_summary.json');
+
+        contributorsFile.writeAsStringSync('''
+maintainers:
+  googlers:
+    - username: Piinks
+      role: maintainer
+  partners:
+    - username: robert-ancell
+      team: "@flutter/canonical"
+      role: maintainer
+
+committers:
+  - username: activeCommitter
+    role: committer
+  - username: inactiveCommitter
+    role: committer
+
+reviewers:
+  - username: promotedReviewer
+    role: reviewer
+  - username: retainedReviewer
+    role: reviewer
+  - username: graceAppealedReviewer
+    role: reviewer
+  - username: recentJoinerReviewer
+    grace_until: "2099-01-01"
+    role: reviewer
+  - username: inactiveReviewer
+    role: reviewer
+
+prospective_new_joiners:
+  - username: Mairramer
+    suggested_role: reviewer
+
+dash_emeritus:
+  - username: returningEmeritus
+    role: emeritus
+  - username: quietEmeritus
+    role: emeritus
+''');
+
+        summaryFile.writeAsStringSync('''
+{
+  "activeCommitter": {"merged_prs": 12, "issues": 5, "reviews": 5, "total": 22},
+  "inactiveCommitter": {"merged_prs": 1, "issues": 1, "reviews": 0, "total": 2},
+  "promotedReviewer": {"merged_prs": 15, "issues": 10, "reviews": 10, "total": 35},
+  "retainedReviewer": {"merged_prs": 4, "issues": 5, "reviews": 5, "total": 14},
+  "graceAppealedReviewer": {"merged_prs": 2, "issues": 2, "reviews": 1, "total": 5},
+  "recentJoinerReviewer": {"merged_prs": 1, "issues": 1, "reviews": 0, "total": 2},
+  "inactiveReviewer": {"merged_prs": 0, "issues": 1, "reviews": 0, "total": 1},
+  "returningEmeritus": {"merged_prs": 5, "issues": 4, "reviews": 3, "total": 12},
+  "Mairramer": {"merged_prs": 10, "issues": 4, "reviews": 2, "total": 16},
+  "discoveredExternal": {"merged_prs": 12, "issues": 10, "reviews": 12, "total": 34},
+  "auto-submit": {"merged_prs": 50, "issues": 0, "reviews": 0, "total": 50}
+}
+''');
+
+        // 1. Verify --community discovers returningEmeritus and discoveredExternal (and ignores auto-submit),
+        // and omits excluded users so no one is singled out in the generated report.
+        final communityResult = Process.runSync('dart', [
+          'run',
+          'tool/quarterly_audit.dart',
+          '--community',
+          '--contributors',
+          contributorsFile.path,
+          '--summary',
+          summaryFile.path,
+        ]);
+        expect(communityResult.exitCode, equals(0));
+        final report = communityResult.stdout as String;
+        expect(
+          report,
+          contains('| @promotedReviewer | Reviewer | **Committer** |'),
+        );
+        expect(
+          report,
+          contains(
+            '| @returningEmeritus | Dasher Emeritus | **Reviewer** (Reinstatement) |',
+          ),
+        );
+        expect(
+          report,
+          contains(
+            '| @discoveredExternal | External Contributor | **Committer** (Invitation) |',
+          ),
+        );
+        expect(
+          report,
+          contains(
+            '| @recentJoinerReviewer | Reviewer (12m recent-joiner carve-out) | 1 | 2 |',
+          ),
+        );
+        expect(report, isNot(contains('auto-submit')));
+
+        // Verify --exclude omits excluded users from the community report completely
+        final filteredCommunityResult = Process.runSync('dart', [
+          'run',
+          'tool/quarterly_audit.dart',
+          '--community',
+          '--exclude',
+          'discoveredExternal,promotedReviewer',
+          '--contributors',
+          contributorsFile.path,
+          '--summary',
+          summaryFile.path,
+        ]);
+        expect(filteredCommunityResult.exitCode, equals(0));
+        final filteredReport = filteredCommunityResult.stdout as String;
+        expect(filteredReport, isNot(contains('discoveredExternal')));
+        expect(
+          filteredReport,
+          isNot(
+            contains('| @promotedReviewer | Reviewer | **Committer** |'),
+          ),
+        );
+        expect(
+          filteredReport,
+          contains('| @promotedReviewer | Reviewer | 15 | 35 |'),
+        );
+
+        // Verify live org reconciliation checks all current Flutter org members so no one slips through
+        final parsedDoc =
+            ContributorsRoster.parse(contributorsFile.readAsStringSync());
+        final liveRoster = reconcileRosterState(
+          parsedDoc,
+          liveOrg: const LiveOrgSnapshot(
+            orgMembers: {
+              'Piinks',
+              'gaaclarke',
+              'LouiseHsu',
+              'robert-ancell',
+              'newPartner',
+              'activeCommitter',
+              'inactiveCommitter',
+              'promotedReviewer',
+              'retainedReviewer',
+              'graceAppealedReviewer',
+              'recentJoinerReviewer',
+              'inactiveReviewer',
+              'quietEmeritus', // still in GitHub org -> must be in 30-day grace period
+              'untrackedOrgMemberLow', // in GitHub org (<10) -> must be in 30-day grace period
+              'untrackedOrgMemberHigh', // in GitHub org (>=10) -> promoted/enrolled
+            },
+            googlers: {'Piinks'},
+            collaborators: {
+              'gaaclarke', // known exception Googler appearing in @flutter/collaborators
+              'LouiseHsu', // known exception Googler appearing in @flutter/collaborators
+              'robert-ancell',
+              'newPartner',
+              'activeCommitter',
+              'untrackedOrgMemberLow',
+            },
+            partners: {'robert-ancell', 'newPartner'},
+            partnerTeams: {
+              'robert-ancell': '@flutter/canonical',
+              'newpartner': '@flutter/cloudsufi',
+            },
+          ),
+        );
+        expect(
+          liveRoster.googlers,
+          containsAll(['Piinks', 'gaaclarke', 'LouiseHsu']),
+        );
+        expect(liveRoster.unassignedOrgMembers, isNot(contains('gaaclarke')));
+        expect(liveRoster.unassignedOrgMembers, isNot(contains('LouiseHsu')));
+        final liveSummary = {
+          'activeCommitter': {
+            'merged_prs': 12,
+            'issues': 5,
+            'reviews': 5,
+            'total': 22,
+          },
+          'inactiveCommitter': {
+            'merged_prs': 1,
+            'issues': 1,
+            'reviews': 0,
+            'total': 2,
+          },
+          'promotedReviewer': {
+            'merged_prs': 15,
+            'issues': 10,
+            'reviews': 10,
+            'total': 35,
+          },
+          'retainedReviewer': {
+            'merged_prs': 4,
+            'issues': 5,
+            'reviews': 5,
+            'total': 14,
+          },
+          'graceAppealedReviewer': {
+            'merged_prs': 2,
+            'issues': 2,
+            'reviews': 1,
+            'total': 5,
+          },
+          'recentJoinerReviewer': {
+            'merged_prs': 1,
+            'issues': 1,
+            'reviews': 0,
+            'total': 2,
+          },
+          'inactiveReviewer': {
+            'merged_prs': 0,
+            'issues': 1,
+            'reviews': 0,
+            'total': 1,
+          },
+          'returningEmeritus': {
+            'merged_prs': 5,
+            'issues': 4,
+            'reviews': 3,
+            'total': 12,
+          },
+          'untrackedOrgMemberLow': {
+            'merged_prs': 1,
+            'issues': 1,
+            'reviews': 0,
+            'total': 2,
+          },
+          'untrackedOrgMemberHigh': {
+            'merged_prs': 12,
+            'issues': 5,
+            'reviews': 3,
+            'total': 20,
+          },
+          'newPartner': {
+            'merged_prs': 4,
+            'issues': 1,
+            'reviews': 0,
+            'total': 5,
+          },
+        };
+        final liveCommunityReport =
+            generateCommunityReport(liveRoster, liveSummary);
+        expect(
+          liveCommunityReport,
+          contains('| @quietEmeritus | Org Member | 0 | In grace period |'),
+        );
+        expect(
+          liveCommunityReport,
+          contains(
+            '| @untrackedOrgMemberLow | Org Member | 2 | In grace period |',
+          ),
+        );
+        expect(
+          liveCommunityReport,
+          contains(
+            '| @untrackedOrgMemberHigh | Org Member | **Reviewer** | 12 | 20 |',
+          ),
+        );
+        expect(
+          liveCommunityReport,
+          contains(
+            '| @returningEmeritus | Dasher Emeritus | **Reviewer** (Reinstatement) | 5 | 12 |',
+          ),
+        );
+
+        final livePartnerReport =
+            generatePartnersReport(liveRoster, liveSummary);
+        expect(
+          livePartnerReport,
+          contains(
+            '| @newPartner | `@flutter/cloudsufi` | Maintainer | 5 contributions | [ ] Verified Active |',
+          ),
+        );
+
+        // Verify --draft-issues outputs ready-to-post issue bodies and gh commands
+        final draftIssuesResult = Process.runSync('dart', [
+          'run',
+          'tool/quarterly_audit.dart',
+          '--draft-issues',
+          '--pr',
+          'https://github.com/flutter/contributors/pull/42',
+          '--contributors',
+          contributorsFile.path,
+          '--summary',
+          summaryFile.path,
+        ]);
+        expect(draftIssuesResult.exitCode, equals(0));
+        final draftOutput = draftIssuesResult.stdout as String;
+        expect(draftOutput, contains('Drafted Quarterly Review Issues'));
+        expect(
+          draftOutput,
+          contains(
+            '> **Proposed roster & report PR:** <https://github.com/flutter/contributors/pull/42>',
+          ),
+        );
+        expect(draftOutput, contains('gh issue create --title'));
+
+        // 2. Verify --finalize applies promotions, reinstatements, grace period transitions, --retain, and --discord
+        final finalizeResult = Process.runSync('dart', [
+          'run',
+          'tool/quarterly_audit.dart',
+          '--finalize',
+          '--contributors',
+          contributorsFile.path,
+          '--summary',
+          summaryFile.path,
+          '--retain',
+          'graceAppealedReviewer',
+          '--discord',
+          'promotedReviewer=promoted_discord',
+        ]);
+        expect(finalizeResult.exitCode, equals(0));
+
+        final updatedYaml = contributorsFile.readAsStringSync();
+        expect(
+          updatedYaml,
+          contains(
+            'committers:\n  # Members of @flutter/committers (Child of @flutter/flutter-hackers)\n  # Granted GitHub Write role / merge access\n  - username: activeCommitter\n    role: committer\n  - username: discoveredExternal\n    role: committer\n  - username: promotedReviewer\n    discord: "promoted_discord"\n    role: committer',
+          ),
+        );
+        expect(
+          updatedYaml,
+          contains(
+            '  - username: graceAppealedReviewer\n    role: reviewer',
+          ),
+        );
+        expect(
+          updatedYaml,
+          contains(
+            '  - username: recentJoinerReviewer\n    grace_until: "2099-01-01"\n    role: reviewer',
+          ),
+        );
+        expect(
+          updatedYaml,
+          contains('  - username: returningEmeritus\n    role: reviewer'),
+        );
+        expect(
+          updatedYaml,
+          contains('  - username: Mairramer\n    role: reviewer'),
+        );
+        expect(updatedYaml, isNot(contains('prospective_new_joiners')));
+        expect(
+          updatedYaml,
+          contains('  - username: inactiveCommitter\n    role: emeritus'),
+        );
+        expect(
+          updatedYaml,
+          contains('  - username: inactiveReviewer\n    role: emeritus'),
+        );
+
+        // 3. Verify --exclude prevents promotion/reinstatement and --dry-run does not modify files
+        contributorsFile.writeAsStringSync('''
+maintainers:
+  googlers:
+    - username: Piinks
+      role: maintainer
+  partners: []
+committers: []
+reviewers:
+  - username: promotedReviewer
+    role: reviewer
+prospective_new_joiners: []
+dash_emeritus:
+  - username: returningEmeritus
+    role: emeritus
+''');
+        final beforeDryRun = contributorsFile.readAsStringSync();
+        final dryRunResult = Process.runSync('dart', [
+          'run',
+          'tool/quarterly_audit.dart',
+          '--finalize',
+          '--dry-run',
+          '--contributors',
+          contributorsFile.path,
+          '--summary',
+          summaryFile.path,
+        ]);
+        expect(dryRunResult.exitCode, equals(0));
+        expect(contributorsFile.readAsStringSync(), equals(beforeDryRun));
+
+        final excludeResult = Process.runSync('dart', [
+          'run',
+          'tool/quarterly_audit.dart',
+          '--finalize',
+          '--contributors',
+          contributorsFile.path,
+          '--summary',
+          summaryFile.path,
+          '--exclude',
+          'promotedReviewer,returningEmeritus,discoveredExternal',
+        ]);
+        expect(excludeResult.exitCode, equals(0));
+        final excludedYaml = contributorsFile.readAsStringSync();
+        // promotedReviewer stays in reviewers instead of promoting to committers
+        expect(excludedYaml, isNot(contains('role: committer')));
+        expect(
+          excludedYaml,
+          contains('  - username: promotedReviewer\n    role: reviewer'),
+        );
+        // returningEmeritus stays in dash_emeritus
+        expect(
+          excludedYaml,
+          contains(
+            'dash_emeritus:\n  # Honored alumni (External, non-org members on GitHub)\n  - username: returningEmeritus',
+          ),
+        );
+        // discoveredExternal is excluded
+        expect(excludedYaml, isNot(contains('discoveredExternal')));
+      } finally {
+        tempDir.deleteSync(recursive: true);
+      }
+    });
+
+    test('handleReviewIssues creates labels and opens issues via ProcessRunner',
+        () async {
+      final mockRunner = MockProcessRunner(
+        stdout: 'https://github.com/flutter/contributors/issues/99\n',
+      );
+      const roster = ResolvedRoster(
+        googlers: ['Piinks'],
+        partners: [(username: 'robert-ancell', team: '@flutter/canonical')],
+        committers: ['activeCommitter'],
+        reviewers: [],
+        unassignedOrgMembers: [],
+        externalEmeriti: [],
+        discordByUserLower: {},
+        graceUntilByUserLower: {},
+      );
+
+      await handleReviewIssues(
+        roster,
+        const {},
+        quarter: 'Q4 2026',
+        quarterSlug: '2099-Q4',
+        excludedUsers: const {},
+        retainedUsers: const {},
+        prLink: 'https://github.com/flutter/contributors/pull/100',
+        openOnGitHub: true,
+        isDryRun: false,
+        runProcess: mockRunner.call,
+      );
+
+      // 4 label creations + 2 issue creations
+      expect(mockRunner.calls, hasLength(6));
+      for (var i = 0; i < 4; i++) {
+        expect(mockRunner.calls[i].executable, equals('gh'));
+        expect(
+            mockRunner.calls[i].arguments.take(2), equals(['label', 'create']));
+      }
+      expect(
+        mockRunner.calls[4].arguments.take(2),
+        equals(['issue', 'create']),
+      );
+      expect(
+        mockRunner.calls[4].arguments,
+        contains(
+            '[Quarterly Review]: Q4 2026 Community Contributor Ladder Audit'),
+      );
+      expect(
+        mockRunner.calls[5].arguments.take(2),
+        equals(['issue', 'create']),
+      );
+      expect(
+        mockRunner.calls[5].arguments,
+        contains('[Quarterly Review]: Q4 2026 Partner Team Verification Audit'),
+      );
+    });
+
+    test('quarterly_audit.dart exits with 1 when no mode flag is provided', () {
+      final result = Process.runSync('dart', [
+        'run',
+        'tool/quarterly_audit.dart',
+      ]);
+      expect(result.exitCode, equals(1));
+    });
+  });
+
+  group('Check User & Grace Period Tooling Tests', () {
+    test('ContributorsRoster parses YAML and round-trips entries cleanly', () {
+      final roster = ContributorsRoster.parse('''
+maintainers:
+  googlers:
+    - username: Piinks
+      discord: "piinks_discord"
+      role: maintainer
+  partners:
+    - username: robert-ancell
+      team: "@flutter/canonical"
+      discord: "robert_discord"
+      role: maintainer
+committers:
+  - username: AbdeMohlbi
+    discord: "abde_discord"
+    role: committer
+reviewers:
+  - username: bdero
+    grace_until: "2027-01-01"
+    role: reviewer
+dash_emeritus:
+  - username: Hixie
+    discord: "hixie_discord"
+    role: emeritus
+''');
+
+      expect(roster.maintainers.googlers.single.username, equals('Piinks'));
+      expect(
+        roster.maintainers.partners.single.team,
+        equals('@flutter/canonical'),
+      );
+      expect(roster.reviewers.single.graceUntil, equals('2027-01-01'));
+
+      final reparsed = ContributorsRoster.parse(
+        roster.toYamlString(lastUpdated: '2026-10-23'),
+      );
+      expect(reparsed.committers.single.username, equals('AbdeMohlbi'));
+      expect(reparsed.committers.single.discord, equals('abde_discord'));
+      expect(reparsed.dashEmeritus.single.username, equals('Hixie'));
+    });
+
+    test('findUserInfo and assessQualification evaluate all ladder tiers', () {
+      final roster = ContributorsRoster.parse('''
+maintainers:
+  googlers:
+    - username: Piinks
+      discord: "piinks_discord"
+      role: maintainer
+  partners:
+    - username: robert-ancell
+      team: "@flutter/canonical"
+      discord: "robert_discord"
+      role: maintainer
+committers:
+  - username: AbdeMohlbi
+    discord: "abde_discord"
+    role: committer
+reviewers:
+  - username: bdero
+    role: reviewer
+dash_emeritus:
+  - username: Hixie
+    discord: "hixie_discord"
+    role: emeritus
+''');
+
+      expect(
+        findUserInfo(roster, 'piinks'),
+        equals((role: 'Maintainer (Google)', discord: 'piinks_discord')),
+      );
+      expect(
+        findUserInfo(roster, 'ROBERT-ANCELL'),
+        equals((role: 'Maintainer (Partner)', discord: 'robert_discord')),
+      );
+      expect(
+        findUserInfo(roster, 'AbdeMohlbi'),
+        equals((
+          role: 'Committer (@flutter/committers)',
+          discord: 'abde_discord',
+        )),
+      );
+      expect(
+        findUserInfo(roster, 'bdero'),
+        equals((role: 'Reviewer (@flutter/reviewers)', discord: null)),
+      );
+      expect(
+        findUserInfo(roster, 'hixie'),
+        equals((role: 'Dasher Emeritus', discord: 'hixie_discord')),
+      );
+      expect(
+        findUserInfo(roster, 'unenrolled_user'),
+        equals((role: null, discord: null)),
+      );
+
+      expect(
+        assessQualification(total: 30, mergedPrs: 10),
+        contains('Qualifies for: Committer'),
+      );
+      expect(
+        assessQualification(total: 35, mergedPrs: 5),
+        contains('Qualifies for: Reviewer'),
+      );
+      expect(
+        assessQualification(total: 10, mergedPrs: 0),
+        contains('Qualifies for: Reviewer'),
+      );
+      expect(
+        assessQualification(total: 5, mergedPrs: 2),
+        contains('Qualifies for: Contributor'),
+      );
+      expect(
+        assessQualification(total: 0, mergedPrs: 0),
+        contains('Inactive over the last 12 months'),
+      );
+    });
+
+    test('check_user.dart CLI evaluates existing and missing arguments', () {
+      final missingUser = Process.runSync('dart', [
+        'run',
+        'tool/check_user.dart',
+      ]);
+      expect(missingUser.exitCode, equals(1));
+
+      final validUser = Process.runSync('dart', [
+        'run',
+        'tool/check_user.dart',
+        'Piinks',
+      ]);
+      expect(validUser.exitCode, equals(0));
+      expect(
+        validUser.stdout as String,
+        contains('Current Roster Status: Maintainer (Google)'),
+      );
+    });
+
+    test(
+        'evaluateGracePeriodIssue, buildWeeklyGracePeriodUpdateComment, and buildGracePeriodConclusionComment handle 30-day window and assignee pings',
+        () {
+      final now = DateTime.utc(2026, 9, 1);
+
+      final activeIssue = {
+        'number': 10,
+        'title': 'Quarterly Contributor Ladder Review - Q3 2026',
+        'createdAt': '2026-08-15T00:00:00Z',
+        'labels': [
+          {'name': 'quarterly-review'},
+        ],
+        'assignees': [
+          {'login': 'Piinks'},
+        ],
+      };
+
+      final activeEval = evaluateGracePeriodIssue(activeIssue, now: now);
+      expect(activeEval.shouldRemind, isFalse);
+      expect(activeEval.shouldPostWeeklyUpdate, isTrue);
+      expect(activeEval.daysElapsed, equals(17));
+      expect(activeEval.daysRemaining, equals(13));
+      expect(activeEval.alreadyConcluded, isFalse);
+      expect(activeEval.assignees, equals(['Piinks']));
+
+      final weeklyComment = buildWeeklyGracePeriodUpdateComment(
+        title: activeIssue['title'] as String,
+        daysElapsed: activeEval.daysElapsed,
+        createdAt: DateTime.parse(activeIssue['createdAt'] as String).toUtc(),
+      );
+      expect(weeklyComment, contains('## Weekly review period status update'));
+      expect(weeklyComment, contains('17 day(s) (opened 2026-08-15)'));
+      expect(
+        weeklyComment,
+        contains(
+          '13 day(s) until the 30-day review window concludes on **2026-09-14**',
+        ),
+      );
+      expect(weeklyComment, contains('If you were tagged above'));
+
+      final expiredIssue = {
+        'number': 11,
+        'title': 'Quarterly Contributor Ladder Review - Q3 2026',
+        'createdAt': '2026-07-31T00:00:00Z',
+        'labels': [
+          {'name': 'quarterly-review'},
+        ],
+        'assignees': [
+          {'login': 'Piinks'},
+        ],
+      };
+      final expiredEval = evaluateGracePeriodIssue(expiredIssue, now: now);
+      expect(expiredEval.shouldRemind, isTrue);
+      expect(expiredEval.shouldPostWeeklyUpdate, isFalse);
+      expect(expiredEval.daysElapsed, equals(32));
+      expect(expiredEval.daysRemaining, equals(0));
+      expect(expiredEval.alreadyConcluded, isFalse);
+
+      final concludedIssue = {
+        'number': 12,
+        'title': 'Quarterly Contributor Ladder Review - Q3 2026',
+        'createdAt': '2026-07-31T00:00:00Z',
+        'labels': [
+          {'name': 'quarterly-review'},
+          {'name': 'grace-period-concluded'},
+        ],
+      };
+      final concludedEval = evaluateGracePeriodIssue(concludedIssue, now: now);
+      expect(concludedEval.shouldRemind, isFalse);
+      expect(concludedEval.shouldPostWeeklyUpdate, isFalse);
+      expect(concludedEval.alreadyConcluded, isTrue);
+
+      final comment = buildGracePeriodConclusionComment(
+        title: 'Quarterly Contributor Ladder Review - Q3 2026',
+        daysElapsed: 32,
+        assignees: expiredEval.assignees,
+      );
+      expect(comment, contains('## 30-day review period concluded'));
+      expect(comment, contains('cc @Piinks'));
+      expect(comment, contains('32 days since opening'));
+      expect(comment, contains('[EMERITUS.md](EMERITUS.md)'));
+      expect(comment, contains('Discord usernames'));
+    });
+
+    test(
+        'runGracePeriodCheck invokes gh commands via ProcessRunner for weekly updates, conclusion reminders, and dry-run',
+        () async {
+      final now = DateTime.utc(2026, 9, 1);
+      final issuesPayload = jsonEncode([
+        {
+          'number': 10,
+          'title': 'Community Audit Q3 2026',
+          'createdAt': '2026-08-15T00:00:00Z',
+          'labels': [
+            {'name': 'quarterly-review'},
+          ],
+          'assignees': [
+            {'login': 'Piinks'},
+          ],
+        },
+        {
+          'number': 11,
+          'title': 'Partner Audit Q3 2026',
+          'createdAt': '2026-07-31T00:00:00Z',
+          'labels': [
+            {'name': 'quarterly-review'},
+          ],
+          'assignees': [
+            {'login': 'Piinks'},
+          ],
+        },
+        {
+          'number': 12,
+          'title': 'Concluded Audit Q2 2026',
+          'createdAt': '2026-05-01T00:00:00Z',
+          'labels': [
+            {'name': 'quarterly-review'},
+            {'name': 'grace-period-concluded'},
+          ],
+          'assignees': [
+            {'login': 'Piinks'},
+          ],
+        },
+      ]);
+
+      // 1. Live mode: lists issues, posts weekly update to #10, creates label + posts conclusion + adds label to #11, skips #12
+      final liveRunner = MockProcessRunner(
+        handler: (executable, arguments) async {
+          if (arguments.length >= 2 &&
+              arguments[0] == 'issue' &&
+              arguments[1] == 'list') {
+            return ProcessResult(1, 0, issuesPayload, '');
+          }
+          return ProcessResult(1, 0, '', '');
+        },
+      );
+
+      await runGracePeriodCheck(
+        isDryRun: false,
+        now: now,
+        runProcess: liveRunner.call,
+      );
+
+      expect(liveRunner.calls, hasLength(5));
+      expect(liveRunner.calls[0].arguments.take(2), equals(['issue', 'list']));
+      expect(
+        liveRunner.calls[1].arguments.take(3),
+        equals(['issue', 'comment', '10']),
+      );
+      expect(
+        liveRunner.calls[1].arguments[4],
+        contains('## Weekly review period status update'),
+      );
+      expect(
+        liveRunner.calls[2].arguments.take(3),
+        equals(['label', 'create', 'grace-period-concluded']),
+      );
+      expect(
+        liveRunner.calls[3].arguments.take(3),
+        equals(['issue', 'comment', '11']),
+      );
+      expect(
+        liveRunner.calls[3].arguments[4],
+        contains('## 30-day review period concluded'),
+      );
+      expect(
+        liveRunner.calls[4].arguments,
+        equals(
+            ['issue', 'edit', '11', '--add-label', 'grace-period-concluded']),
+      );
+
+      // 2. Dry-run mode: lists issues only and performs zero mutations
+      final dryRunner = MockProcessRunner(stdout: issuesPayload);
+      await runGracePeriodCheck(
+        isDryRun: true,
+        now: now,
+        runProcess: dryRunner.call,
+      );
+      expect(dryRunner.calls, hasLength(1));
+      expect(
+          dryRunner.calls.single.arguments.take(2), equals(['issue', 'list']));
+
+      // 3. Error / non-zero exit handling in getOpenQuarterlyIssues
+      final errorRunner = MockProcessRunner(exitCode: 1, stderr: 'auth error');
+      final emptyOnFailure =
+          await getOpenQuarterlyIssues(runProcess: errorRunner.call);
+      expect(emptyOnFailure, isEmpty);
+
+      final throwingRunner = MockProcessRunner(
+        exceptionToThrow: const ProcessException('gh', ['issue', 'list']),
+      );
+      final emptyOnException =
+          await getOpenQuarterlyIssues(runProcess: throwingRunner.call);
+      expect(emptyOnException, isEmpty);
+    });
+  });
+}
diff --git a/test/roster_validation_test.dart b/test/roster_validation_test.dart
new file mode 100644
index 0000000..dfe6c05
--- /dev/null
+++ b/test/roster_validation_test.dart
@@ -0,0 +1,292 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+import 'package:test/test.dart';
+import 'package:yaml/yaml.dart';
+import '../tool/generate_roster.dart';
+import '../tool/seed_initial_data.dart';
+import '../tool/validate_roster.dart';
+
+void main() {
+  group('Roster Schema & Integrity Tests', () {
+    late String yamlContent;
+    late YamlMap doc;
+
+    setUpAll(() {
+      final file = File('data/contributors.yaml');
+      expect(file.existsSync(), isTrue,
+          reason: 'data/contributors.yaml must exist');
+      yamlContent = file.readAsStringSync();
+      final loaded = loadYaml(yamlContent);
+      expect(loaded, isA<YamlMap>());
+      doc = loaded as YamlMap;
+    });
+
+    test('contributors.yaml contains all required root sections', () {
+      expect(doc.containsKey('maintainers'), isTrue);
+      expect(doc.containsKey('committers'), isTrue);
+      expect(doc.containsKey('reviewers'), isTrue);
+      expect(doc.containsKey('dash_emeritus'), isTrue);
+    });
+
+    test('maintainers contains strictly googlers and partners', () {
+      final maintainers = doc['maintainers'] as YamlMap;
+      expect(maintainers.keys.toSet(), equals({'googlers', 'partners'}));
+
+      final googlers = maintainers['googlers'] as YamlList;
+      final partners = maintainers['partners'] as YamlList;
+
+      expect(googlers, isNotEmpty);
+      expect(partners, isNotEmpty);
+    });
+
+    test('all member handles across the entire roster are unique', () {
+      final seen = <String, String>{};
+
+      void checkUser(dynamic entry, String section) {
+        expect(entry, isA<YamlMap>());
+        final username = (entry as YamlMap)['username'] as String?;
+        expect(username, isNotNull);
+        expect(username!.trim(), isNotEmpty);
+
+        final lower = username.toLowerCase();
+        expect(seen.containsKey(lower), isFalse,
+            reason:
+                'Duplicate username "@$username" in $section (already in ${seen[lower]})');
+        seen[lower] = section;
+      }
+
+      final maintainers = doc['maintainers'] as YamlMap;
+      for (final g in maintainers['googlers'] as YamlList) {
+        checkUser(g, 'maintainers.googlers');
+      }
+      for (final p in maintainers['partners'] as YamlList) {
+        checkUser(p, 'maintainers.partners');
+      }
+      for (final c in doc['committers'] as YamlList) {
+        checkUser(c, 'committers');
+      }
+      for (final r in doc['reviewers'] as YamlList) {
+        checkUser(r, 'reviewers');
+      }
+      for (final e in doc['dash_emeritus'] as YamlList) {
+        checkUser(e, 'dash_emeritus');
+      }
+    });
+
+    test('all roles belong to the allowed set of ladder roles', () {
+      const allowedRoles = {'maintainer', 'committer', 'reviewer', 'emeritus'};
+
+      void verifyRole(dynamic entry) {
+        final map = entry as YamlMap;
+        final role = map['role'] as String? ?? map['suggested_role'] as String?;
+        if (role != null) {
+          expect(allowedRoles.contains(role.toLowerCase()), isTrue,
+              reason: 'Invalid role "$role" for user ${map['username']}');
+        }
+      }
+
+      final maintainers = doc['maintainers'] as YamlMap;
+      (maintainers['googlers'] as YamlList).forEach(verifyRole);
+      (maintainers['partners'] as YamlList).forEach(verifyRole);
+      (doc['committers'] as YamlList).forEach(verifyRole);
+      (doc['reviewers'] as YamlList).forEach(verifyRole);
+      (doc['dash_emeritus'] as YamlList).forEach(verifyRole);
+    });
+
+    test('validateContributorsYaml passes on production data/contributors.yaml',
+        () {
+      expect(validateContributorsYaml(doc), isEmpty);
+    });
+
+    test(
+        'validateContributorsYaml detects invalid schemas, duplicate users, invalid roles, and invalid maintainer groups',
+        () {
+      expect(
+        validateContributorsYaml(loadYaml('- not_a_map')),
+        contains(contains('root must be a YAML mapping')),
+      );
+
+      final invalidDoc = loadYaml('''
+maintainers:
+  googlers:
+    - username: alice
+      role: maintainer
+      discord: "alice_discord"
+  partners:
+    - username: bob
+      role: maintainer
+  community:
+    - username: invalidGroupUser
+      role: maintainer
+committers:
+  - "not_a_map_entry"
+  - role: committer
+  - username: ALICE
+    role: committer
+  - username: charlie
+    role: superadmin
+  - username: dave
+    role: committer
+    discord: "   "
+reviewers: []
+dash_emeritus: []
+''');
+
+      final errors = validateContributorsYaml(invalidDoc);
+      expect(
+          errors,
+          contains(
+              contains('invalid group "community"'))); // non-googler/partner
+      expect(errors, contains(contains('entry is not a map')));
+      expect(errors, contains(contains('missing username')));
+      expect(errors,
+          contains(contains('duplicate username "@ALICE" in committers')));
+      expect(errors, contains(contains('invalid role "superadmin"')));
+      expect(
+          errors,
+          contains(
+              contains('invalid or empty discord username for user @dave')));
+    });
+
+    test(
+        'known_maintainers.txt single source of truth enforces Maintainer placement',
+        () {
+      final known = loadKnownExceptionMaintainers();
+      expect(
+          known,
+          containsAll([
+            'CarlosMendonca',
+            'LouiseHsu',
+            'abdallahshaban557',
+            'andywolff',
+            'gaaclarke',
+            'gmackall',
+            'jesswrd',
+          ]));
+
+      final badPlacementDoc = loadYaml('''
+maintainers:
+  googlers:
+    - username: Piinks
+      role: maintainer
+  partners: []
+committers:
+  - username: gaaclarke
+    role: committer
+reviewers: []
+dash_emeritus:
+  - username: CarlosMendonca
+    role: emeritus
+''');
+      final errors = validateContributorsYaml(badPlacementDoc);
+      expect(
+          errors,
+          contains(contains(
+              '"@gaaclarke" is a known Maintainer and must be listed under maintainers.googlers')));
+      expect(
+          errors,
+          contains(contains(
+              '"@CarlosMendonca" is a known Maintainer and must be listed under maintainers.googlers')));
+    });
+
+    test(
+        'buildRosterMarkdown, buildEmeritusMarkdown, and generate_roster CLI --check',
+        () {
+      final tempDir = Directory.systemTemp.createTempSync('roster_gen_test_');
+      try {
+        final yamlFile = File('${tempDir.path}/contributors.yaml');
+        final summaryFile = File('${tempDir.path}/activity_summary.json');
+        final rosterFile = File('${tempDir.path}/ROSTER.md');
+        final emeritusFile = File('${tempDir.path}/EMERITUS.md');
+
+        writeContributorsYaml(
+          googlers: ['Piinks'],
+          partners: ['robert-ancell'],
+          partnerTeams: {'robert-ancell': '@flutter/canonical'},
+          committers: ['alice'],
+          reviewers: ['bob'],
+          emeriti: ['formerDasher'],
+          outputFile: yamlFile,
+        );
+        summaryFile.writeAsStringSync(
+            '{"alice": {"merged_prs": 15, "total": 40}, "bob": {"merged_prs": 3, "total": 12}}');
+
+        final parsedYaml = loadYaml(yamlFile.readAsStringSync()) as YamlMap;
+        expect(validateContributorsYaml(parsedYaml), isEmpty);
+        expect(buildRosterMarkdown(parsedYaml, {}),
+            contains('## Committers (`@flutter/committers`)'));
+        expect(
+            buildEmeritusMarkdown(parsedYaml), contains('# Dasher Emeritus'));
+
+        // --check should fail before ROSTER.md and EMERITUS.md exist
+        final checkBefore = Process.runSync('dart', [
+          'run',
+          'tool/generate_roster.dart',
+          '--check',
+          '--contributors',
+          yamlFile.path,
+          '--summary',
+          summaryFile.path,
+          '--roster',
+          rosterFile.path,
+          '--emeritus',
+          emeritusFile.path,
+        ]);
+        expect(checkBefore.exitCode, equals(1));
+
+        // Generate ROSTER.md and EMERITUS.md
+        final genResult = Process.runSync('dart', [
+          'run',
+          'tool/generate_roster.dart',
+          '--contributors',
+          yamlFile.path,
+          '--summary',
+          summaryFile.path,
+          '--roster',
+          rosterFile.path,
+          '--emeritus',
+          emeritusFile.path,
+        ]);
+        expect(genResult.exitCode, equals(0));
+        expect(rosterFile.existsSync(), isTrue);
+        expect(emeritusFile.existsSync(), isTrue);
+
+        final rosterMd = rosterFile.readAsStringSync();
+        expect(rosterMd, contains('[@Piinks](https://github.com/Piinks)'));
+        expect(rosterMd,
+            contains('[@robert-ancell](https://github.com/robert-ancell)'));
+        expect(
+            rosterMd,
+            contains(
+                '| @alice | [github.com/alice](https://github.com/alice) | 15 | 40 |'));
+        expect(rosterMd, isNot(contains('Prospective new joiners')));
+
+        final emeritusMd = emeritusFile.readAsStringSync();
+        expect(emeritusMd,
+            contains('[@formerDasher](https://github.com/formerDasher)'));
+        expect(emeritusMd, contains('https://github.com/flutter/rfc'));
+
+        // --check should now pass
+        final checkAfter = Process.runSync('dart', [
+          'run',
+          'tool/generate_roster.dart',
+          '--check',
+          '--contributors',
+          yamlFile.path,
+          '--summary',
+          summaryFile.path,
+          '--roster',
+          rosterFile.path,
+          '--emeritus',
+          emeritusFile.path,
+        ]);
+        expect(checkAfter.exitCode, equals(0));
+      } finally {
+        tempDir.deleteSync(recursive: true);
+      }
+    });
+  });
+}
diff --git a/tool/bots.dart b/tool/bots.dart
index eaac81b..33010ab 100644
--- a/tool/bots.dart
+++ b/tool/bots.dart
@@ -1,4 +1,4 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
+// Copyright 2026 The Flutter Authors.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
diff --git a/tool/check_grace_period.dart b/tool/check_grace_period.dart
new file mode 100644
index 0000000..8f448b9
--- /dev/null
+++ b/tool/check_grace_period.dart
@@ -0,0 +1,301 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+import 'dart:io';
+
+import 'process_runner.dart';
+
+/// Tool that inspects open quarterly review issues weekly, posts a weekly
+/// countdown update while < 30 days have elapsed, and pings the assignee once
+/// the 30-day review period has concluded.
+void main(List<String> args) async {
+  final isDryRun =
+      Platform.environment['DRY_RUN'] == 'true' || args.contains('--dry-run');
+  await runGracePeriodCheck(isDryRun: isDryRun);
+}
+
+/// Evaluates all open `quarterly-review` issues and posts weekly countdown
+/// updates or 30-day conclusion reminders via [runProcess].
+Future<void> runGracePeriodCheck({
+  bool isDryRun = false,
+  DateTime? now,
+  ProcessRunner runProcess = Process.run,
+}) async {
+  print(
+    'Checking open quarterly review issues for 30-day grace period status...',
+  );
+  if (isDryRun) {
+    print('Running in DRY-RUN mode. No comments will be posted.');
+  }
+
+  final issues = await getOpenQuarterlyIssues(runProcess: runProcess);
+  if (issues.isEmpty) {
+    print('No open quarterly review issues found.');
+    return;
+  }
+
+  final currentUtc = (now ?? DateTime.now()).toUtc();
+  print('Found ${issues.length} open quarterly review issue(s).');
+
+  for (final issue in issues) {
+    final number = issue['number'] as int;
+    final title = issue['title'] as String;
+    final createdAtStr = issue['createdAt'] as String;
+    final createdAt = DateTime.parse(createdAtStr).toUtc();
+    final eval = evaluateGracePeriodIssue(issue, now: currentUtc);
+
+    if (eval.alreadyConcluded) {
+      print(
+        'Issue #$number ("$title"): Grace period reminder already posted. Skipping.',
+      );
+      continue;
+    }
+
+    final daysElapsed = eval.daysElapsed;
+    print(
+      'Issue #$number ("$title"): $daysElapsed days elapsed since creation ($createdAtStr).',
+    );
+
+    if (eval.shouldRemind) {
+      print(
+        '>>> Grace period has elapsed (>= 30 days) for Issue #$number! Pinging assignee(s): ${eval.assignees.join(', ')}',
+      );
+      final commentBody = buildGracePeriodConclusionComment(
+        title: title,
+        daysElapsed: daysElapsed,
+        assignees: eval.assignees,
+      );
+
+      if (!isDryRun) {
+        await ensureGracePeriodConcludedLabel(runProcess: runProcess);
+        await postIssueComment(number, commentBody, runProcess: runProcess);
+        await addIssueLabel(
+          number,
+          'grace-period-concluded',
+          runProcess: runProcess,
+        );
+        print(
+          'Successfully posted grace period conclusion reminder and added label to Issue #$number.',
+        );
+      } else {
+        print(
+          'Dry run: Would have posted the following conclusion comment to #$number:\n',
+        );
+        print(commentBody);
+      }
+    } else if (eval.shouldPostWeeklyUpdate) {
+      print(
+        'Issue #$number: ${eval.daysRemaining} day(s) remaining in the 30-day grace period. Posting weekly status update...',
+      );
+      final weeklyComment = buildWeeklyGracePeriodUpdateComment(
+        title: title,
+        daysElapsed: daysElapsed,
+        createdAt: createdAt,
+      );
+
+      if (!isDryRun) {
+        await postIssueComment(number, weeklyComment, runProcess: runProcess);
+        print('Successfully posted weekly status update to Issue #$number.');
+      } else {
+        print(
+          'Dry run: Would have posted the following weekly status update to #$number:\n',
+        );
+        print(weeklyComment);
+      }
+    }
+  }
+}
+
+/// Extracts the assignee GitHub usernames from an issue JSON map, falling back
+/// to the author login or `'Piinks'` if no assignees are set.
+List<String> extractAssignees(Map<String, dynamic> item) {
+  final assigneesList = (item['assignees'] as List? ?? [])
+      .map((a) => (a as Map<String, dynamic>)['login'] as String?)
+      .whereType<String>()
+      .where((login) => login.trim().isNotEmpty)
+      .toList();
+  if (assigneesList.isNotEmpty) {
+    return assigneesList;
+  }
+
+  final authorLogin =
+      (item['author'] as Map<String, dynamic>?)?['login'] as String?;
+  if (authorLogin != null && authorLogin.trim().isNotEmpty) {
+    return [authorLogin.trim()];
+  }
+
+  return const ['Piinks'];
+}
+
+/// Evaluates whether an open quarterly review issue needs a weekly update or a
+/// 30-day grace period conclusion reminder.
+({
+  bool shouldRemind,
+  bool shouldPostWeeklyUpdate,
+  int daysElapsed,
+  int daysRemaining,
+  bool alreadyConcluded,
+  List<String> assignees,
+}) evaluateGracePeriodIssue(
+  Map<String, dynamic> issue, {
+  required DateTime now,
+}) {
+  final createdAtStr = issue['createdAt'] as String;
+  final createdAt = DateTime.parse(createdAtStr).toUtc();
+  final labels = (issue['labels'] as List? ?? [])
+      .map((l) => (l as Map<String, dynamic>)['name'] as String)
+      .toSet();
+
+  final alreadyConcluded = labels.contains('grace-period-concluded');
+  final daysElapsed = now.toUtc().difference(createdAt).inDays;
+  final daysRemaining = (30 - daysElapsed).clamp(0, 30);
+  final assignees = extractAssignees(issue);
+
+  return (
+    shouldRemind: !alreadyConcluded && daysElapsed >= 30,
+    shouldPostWeeklyUpdate: !alreadyConcluded && daysElapsed < 30,
+    daysElapsed: daysElapsed,
+    daysRemaining: daysRemaining,
+    alreadyConcluded: alreadyConcluded,
+    assignees: assignees,
+  );
+}
+
+/// Builds the weekly status update comment posted on open quarterly review
+/// issues while the 30-day review period is in progress.
+String buildWeeklyGracePeriodUpdateComment({
+  required String title,
+  required int daysElapsed,
+  required DateTime createdAt,
+}) {
+  final daysRemaining = (30 - daysElapsed).clamp(0, 30);
+  final createdDate = createdAt.toUtc().toIso8601String().split('T').first;
+  final targetEndDate = createdAt
+      .toUtc()
+      .add(const Duration(days: 30))
+      .toIso8601String()
+      .split('T')
+      .first;
+
+  return '''
+## Weekly review period status update
+
+**$title** is currently in the 30-day review and grace period:
+
+- **Elapsed:** $daysElapsed day(s) (opened $createdDate)
+- **Remaining:** $daysRemaining day(s) until the 30-day review window concludes on **$targetEndDate**
+
+If you were tagged above and have not yet replied, please comment on this thread before **$targetEndDate** to accept your invitation, share your Discord username for team member role provisioning, or share qualitative contributions (issue triage, reproductions, [RFCs](https://github.com/flutter/rfc), design docs, or mentoring).
+''';
+}
+
+/// Builds the markdown comment to post when the 30-day grace period concludes,
+/// pinging the assignee(s).
+String buildGracePeriodConclusionComment({
+  required String title,
+  required int daysElapsed,
+  List<String> assignees = const ['Piinks'],
+}) {
+  final effectiveAssignees = assignees.isEmpty ? const ['Piinks'] : assignees;
+  final mentions = effectiveAssignees
+      .map((a) => a.trim().startsWith('@') ? a.trim() : '@${a.trim()}')
+      .join(', ');
+
+  return '''
+## 30-day review period concluded
+
+cc $mentions — The 30-day review and grace period for **$title** has concluded ($daysElapsed days since opening).
+
+### Next steps
+
+1. Review qualitative contributions, appeals, and Discord usernames shared by new joiners/promoted members in this thread.
+2. On the open quarterly review PR branch, run `dart run tool/quarterly_audit.dart --finalize --retain ... --exclude ... --discord user=handle` to update `data/contributors.yaml`, [ROSTER.md](ROSTER.md), and [EMERITUS.md](EMERITUS.md), then merge the PR.
+3. Update GitHub teams (`@flutter/reviewers`, `@flutter/committers`, and `@flutter/maintainers` as child teams of `@flutter/flutter-hackers`, along with `@flutter/partners` child teams), grant the Discord team member role to newly added ladder members, and remove members transitioning to Dasher Emeritus from the GitHub organization.
+4. Close this issue once updates land.
+''';
+}
+
+/// Queries GitHub for open issues labeled 'quarterly-review'.
+Future<List<Map<String, dynamic>>> getOpenQuarterlyIssues({
+  ProcessRunner runProcess = Process.run,
+}) async {
+  try {
+    final result = await runProcess('gh', [
+      'issue',
+      'list',
+      '--state',
+      'open',
+      '--label',
+      'quarterly-review',
+      '--json',
+      'number,title,createdAt,labels,assignees,author',
+    ]);
+
+    if (result.exitCode != 0) {
+      print(
+        'Notice: gh issue list exited with code ${result.exitCode}: ${result.stderr}',
+      );
+      return [];
+    }
+
+    final decoded = jsonDecode(result.stdout as String) as List;
+    return decoded.cast<Map<String, dynamic>>();
+  } catch (e) {
+    print('Notice: Could not query GitHub issues: $e');
+    return [];
+  }
+}
+
+/// Ensures the `grace-period-concluded` label exists in the repository.
+Future<void> ensureGracePeriodConcludedLabel({
+  ProcessRunner runProcess = Process.run,
+}) async {
+  await runProcess('gh', [
+    'label',
+    'create',
+    'grace-period-concluded',
+    '--description',
+    '30-day review period elapsed',
+    '--color',
+    'FBCA04',
+    '--force',
+  ]);
+}
+
+/// Posts a comment to a GitHub issue.
+Future<void> postIssueComment(
+  int issueNumber,
+  String body, {
+  ProcessRunner runProcess = Process.run,
+}) async {
+  final result = await runProcess('gh', [
+    'issue',
+    'comment',
+    '$issueNumber',
+    '--body',
+    body,
+  ]);
+  if (result.exitCode != 0) {
+    print('Failed to post comment to #$issueNumber: ${result.stderr}');
+  }
+}
+
+/// Adds a label to a GitHub issue.
+Future<void> addIssueLabel(
+  int issueNumber,
+  String label, {
+  ProcessRunner runProcess = Process.run,
+}) async {
+  final result = await runProcess('gh', [
+    'issue',
+    'edit',
+    '$issueNumber',
+    '--add-label',
+    label,
+  ]);
+  if (result.exitCode != 0) {
+    print('Failed to add label "$label" to #$issueNumber: ${result.stderr}');
+  }
+}
diff --git a/tool/check_user.dart b/tool/check_user.dart
new file mode 100644
index 0000000..f379817
--- /dev/null
+++ b/tool/check_user.dart
@@ -0,0 +1,144 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:args/args.dart';
+
+import 'contributors_roster.dart';
+import 'github.dart';
+
+void main(List<String> args) async {
+  final parser = ArgParser()
+    ..addOption('user', abbr: 'u', help: 'GitHub username to evaluate')
+    ..addFlag(
+      'live',
+      abbr: 'l',
+      help: 'Query live GitHub API instead of cache',
+      defaultsTo: false,
+    );
+
+  final results = parser.parse(args);
+  final username = results['user'] as String? ??
+      (results.rest.isNotEmpty ? results.rest.first : null);
+  final isLive = results['live'] as bool;
+
+  if (username == null || username.isEmpty) {
+    print('Usage: dart run tool/check_user.dart <username> [--live]');
+    exit(1);
+  }
+
+  print('=== Contributor Activity Lookup: @$username ===\n');
+
+  // 1. Check current roster status
+  String? currentRole;
+  String? discordHandle;
+  final contributorsYamlFile = File('data/contributors.yaml');
+  if (contributorsYamlFile.existsSync()) {
+    final roster =
+        ContributorsRoster.parse(contributorsYamlFile.readAsStringSync());
+    final info = findUserInfo(roster, username);
+    currentRole = info.role;
+    discordHandle = info.discord;
+  }
+
+  if (currentRole != null) {
+    print('Current Roster Status: $currentRole');
+    if (discordHandle != null && discordHandle.isNotEmpty) {
+      print('Discord Username:      $discordHandle');
+    }
+  } else {
+    print('Current Roster Status: External Contributor (Not enrolled in org)');
+  }
+
+  // 2. Fetch or retrieve activity stats
+  var stats = <String, int>{};
+
+  if (isLive) {
+    print('Querying live GitHub API for @$username over the last 12 months...');
+    final client = GitHubClient();
+    try {
+      final now = DateTime.now().toUtc();
+      final oneYearAgo = now.subtract(const Duration(days: 365));
+      stats =
+          await client.getUserActivity(username, since: oneYearAgo, until: now);
+    } finally {
+      client.close();
+    }
+  } else {
+    final summaryFile = File('data/activity_summary.json');
+    if (summaryFile.existsSync()) {
+      try {
+        final summary =
+            jsonDecode(summaryFile.readAsStringSync()) as Map<String, dynamic>;
+        if (summary.containsKey(username)) {
+          stats = Map<String, int>.from(summary[username] as Map);
+        }
+      } catch (_) {}
+    }
+  }
+
+  final total = stats['total'] ?? 0;
+  final prs = stats['merged_prs'] ?? 0;
+  final issues = stats['issues'] ?? 0;
+  final reviews = stats['reviews'] ?? 0;
+
+  print('\n12-Month Activity Summary:');
+  print('  • Merged PRs Authored: $prs');
+  print('  • Issues Created:      $issues');
+  print('  • Merged PR Reviews:   $reviews');
+  print('  • Total Contributions: $total');
+
+  print('\nQualification Assessment:');
+  print('  ${assessQualification(total: total, mergedPrs: prs)}');
+}
+
+/// Evaluates 12-month activity counts against Contributor Ladder tier thresholds.
+String assessQualification({required int total, required int mergedPrs}) {
+  if (total >= 30 && mergedPrs >= 10) {
+    return '🎉 Qualifies for: Committer (≥ 30 contributions, ≥ 10 merged PRs)';
+  } else if (total >= 10) {
+    return '✅ Qualifies for: Reviewer (≥ 10 qualifying contributions)';
+  } else if (total > 0) {
+    return '🌱 Qualifies for: Contributor (< 10 contributions)';
+  } else {
+    return '⏳ Inactive over the last 12 months (Dasher Emeritus candidate if currently on ladder)';
+  }
+}
+
+/// Looks up [username] in [roster] and returns their formatted ladder role and
+/// Discord handle if present.
+({String? role, String? discord}) findUserInfo(
+  ContributorsRoster roster,
+  String username,
+) {
+  final target = username.toLowerCase();
+  for (final g in roster.maintainers.googlers) {
+    if (g.username.toLowerCase() == target) {
+      return (role: 'Maintainer (Google)', discord: g.discord);
+    }
+  }
+  for (final p in roster.maintainers.partners) {
+    if (p.username.toLowerCase() == target) {
+      return (role: 'Maintainer (Partner)', discord: p.discord);
+    }
+  }
+  for (final c in roster.committers) {
+    if (c.username.toLowerCase() == target) {
+      return (role: 'Committer (@flutter/committers)', discord: c.discord);
+    }
+  }
+  for (final r in roster.reviewers) {
+    if (r.username.toLowerCase() == target) {
+      return (role: 'Reviewer (@flutter/reviewers)', discord: r.discord);
+    }
+  }
+  for (final e in roster.dashEmeritus) {
+    if (e.username.toLowerCase() == target) {
+      return (role: 'Dasher Emeritus', discord: e.discord);
+    }
+  }
+  return (role: null, discord: null);
+}
diff --git a/tool/contributors_roster.dart b/tool/contributors_roster.dart
new file mode 100644
index 0000000..9acabb2
--- /dev/null
+++ b/tool/contributors_roster.dart
@@ -0,0 +1,177 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:yaml/yaml.dart';
+
+/// Immutable contributor entry parsed from `data/contributors.yaml`.
+final class ContributorEntry {
+  const ContributorEntry({
+    required this.username,
+    this.role,
+    this.team,
+    this.discord,
+    this.graceUntil,
+  });
+
+  factory ContributorEntry.fromYaml(YamlMap map) {
+    final username = (map['username'] as String? ?? '').trim();
+    final role = (map['role'] as String?)?.trim();
+    final team = (map['team'] as String?)?.trim();
+    final discord = (map['discord'] as String?)?.trim();
+    final graceUntil = (map['grace_until'] as String?)?.trim();
+    return ContributorEntry(
+      username: username,
+      role: (role != null && role.isNotEmpty) ? role : null,
+      team: (team != null && team.isNotEmpty) ? team : null,
+      discord: (discord != null && discord.isNotEmpty) ? discord : null,
+      graceUntil:
+          (graceUntil != null && graceUntil.isNotEmpty) ? graceUntil : null,
+    );
+  }
+
+  final String username;
+  final String? role;
+  final String? team;
+  final String? discord;
+  final String? graceUntil;
+
+  /// Formats this entry as a YAML list item at [indent] spaces.
+  String toYamlEntry({required int indent, required String defaultRole}) {
+    final pad = ' ' * indent;
+    final fieldPad = ' ' * (indent + 2);
+    final lines = <String>[
+      '$pad- username: $username',
+      if (team != null) '${fieldPad}team: "$team"',
+      if (discord != null) '${fieldPad}discord: "$discord"',
+      if (graceUntil != null) '${fieldPad}grace_until: "$graceUntil"',
+      '${fieldPad}role: ${role ?? defaultRole}',
+    ];
+    return lines.join('\n');
+  }
+}
+
+/// Immutable `maintainers` section (`googlers` and `partners`) of
+/// `data/contributors.yaml`.
+final class MaintainersRoster {
+  const MaintainersRoster({
+    this.googlers = const [],
+    this.partners = const [],
+  });
+
+  factory MaintainersRoster.fromYaml(YamlMap? map) {
+    if (map == null) return const MaintainersRoster();
+    return MaintainersRoster(
+      googlers: ContributorsRoster._parseEntries(map['googlers']),
+      partners: ContributorsRoster._parseEntries(map['partners']),
+    );
+  }
+
+  final List<ContributorEntry> googlers;
+  final List<ContributorEntry> partners;
+}
+
+/// Strongly-typed immutable representation of `data/contributors.yaml`.
+final class ContributorsRoster {
+  const ContributorsRoster({
+    this.maintainers = const MaintainersRoster(),
+    this.committers = const [],
+    this.reviewers = const [],
+    this.dashEmeritus = const [],
+  });
+
+  factory ContributorsRoster.parse(String yamlContent) {
+    final dynamic parsed = loadYaml(yamlContent);
+    if (parsed is! YamlMap) {
+      return const ContributorsRoster();
+    }
+    return ContributorsRoster.fromYaml(parsed);
+  }
+
+  factory ContributorsRoster.fromYaml(YamlMap doc) {
+    return ContributorsRoster(
+      maintainers: MaintainersRoster.fromYaml(doc['maintainers'] as YamlMap?),
+      committers: _parseEntries(doc['committers']),
+      reviewers: _parseEntries(doc['reviewers']),
+      dashEmeritus: _parseEntries(doc['dash_emeritus']),
+    );
+  }
+
+  final MaintainersRoster maintainers;
+  final List<ContributorEntry> committers;
+  final List<ContributorEntry> reviewers;
+  final List<ContributorEntry> dashEmeritus;
+
+  static List<ContributorEntry> _parseEntries(Object? rawList) {
+    if (rawList is! YamlList) return const [];
+    return List<ContributorEntry>.unmodifiable([
+      for (final item in rawList)
+        if (item is YamlMap) ContributorEntry.fromYaml(item),
+    ]);
+  }
+
+  static String _formatBlock(
+    List<ContributorEntry> entries, {
+    required int indent,
+    required String defaultRole,
+  }) {
+    if (entries.isEmpty) return '';
+    final formatted = [
+      for (final entry in entries)
+        entry.toYamlEntry(indent: indent, defaultRole: defaultRole),
+    ].join('\n');
+    return '\n$formatted';
+  }
+
+  /// Serializes this roster into the canonical `data/contributors.yaml` format.
+  String toYamlString({required String lastUpdated}) {
+    final googlerBlock = _formatBlock(
+      maintainers.googlers,
+      indent: 4,
+      defaultRole: 'maintainer',
+    );
+    final partnerBlock = _formatBlock(
+      maintainers.partners,
+      indent: 4,
+      defaultRole: 'maintainer',
+    );
+    final committerBlock = _formatBlock(
+      committers,
+      indent: 2,
+      defaultRole: 'committer',
+    );
+    final reviewerBlock = _formatBlock(
+      reviewers,
+      indent: 2,
+      defaultRole: 'reviewer',
+    );
+    final emeritusBlock = _formatBlock(
+      dashEmeritus,
+      indent: 2,
+      defaultRole: 'emeritus',
+    );
+
+    return '''
+# Flutter Contributor Ladder Roster
+# Source of truth for Flutter contributor roles and permissions.
+# Last updated: $lastUpdated
+
+maintainers:
+  # Maintainers on the Flutter team (@flutter/googlers and @flutter/partners)
+  # Granted Write access + Org Moderation
+  googlers:$googlerBlock
+  partners:$partnerBlock
+
+committers:
+  # Members of @flutter/committers (Child of @flutter/flutter-hackers)
+  # Granted GitHub Write role / merge access$committerBlock
+
+reviewers:
+  # Members of @flutter/reviewers (Child of @flutter/flutter-hackers)
+  # Granted GitHub Triage role$reviewerBlock
+
+dash_emeritus:
+  # Honored alumni (External, non-org members on GitHub)$emeritusBlock
+''';
+  }
+}
diff --git a/tool/generate_roster.dart b/tool/generate_roster.dart
new file mode 100644
index 0000000..18800cc
--- /dev/null
+++ b/tool/generate_roster.dart
@@ -0,0 +1,200 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+import 'dart:io';
+import 'package:args/args.dart';
+import 'package:yaml/yaml.dart';
+
+void main(List<String> args) {
+  final parser = ArgParser()
+    ..addFlag('check',
+        help:
+            'Verify that ROSTER.md and EMERITUS.md match data/contributors.yaml without modifying files',
+        defaultsTo: false)
+    ..addOption('contributors',
+        help: 'Path to contributors.yaml', defaultsTo: 'data/contributors.yaml')
+    ..addOption('summary',
+        help: 'Path to activity_summary.json',
+        defaultsTo: 'data/activity_summary.json')
+    ..addOption('roster', help: 'Path to ROSTER.md', defaultsTo: 'ROSTER.md')
+    ..addOption('emeritus',
+        help: 'Path to EMERITUS.md', defaultsTo: 'EMERITUS.md');
+
+  final results = parser.parse(args);
+  final isCheck = results['check'] as bool;
+  final contributorsPath = results['contributors'] as String;
+  final summaryPath = results['summary'] as String;
+  final rosterPath = results['roster'] as String;
+  final emeritusPath = results['emeritus'] as String;
+
+  final yamlFile = File(contributorsPath);
+  if (!yamlFile.existsSync()) {
+    print('Error: $contributorsPath not found.');
+    exit(1);
+  }
+
+  final doc = loadYaml(yamlFile.readAsStringSync()) as YamlMap;
+
+  final summaryFile = File(summaryPath);
+  var summary = <String, dynamic>{};
+  if (summaryFile.existsSync()) {
+    try {
+      summary =
+          jsonDecode(summaryFile.readAsStringSync()) as Map<String, dynamic>;
+    } catch (_) {}
+  }
+
+  String preservePendingAuditBanner(File targetFile, String generated) {
+    if (!targetFile.existsSync()) return generated;
+    final existing = targetFile.readAsStringSync();
+    final match = RegExp(
+      r'\n(> \[!IMPORTANT\]\n> \*\*Pending Q4 Audit:\*\*[^\n]*\n)',
+    ).firstMatch(existing);
+    if (match == null) return generated;
+    final firstNewline = generated.indexOf('\n');
+    if (firstNewline == -1) return generated;
+    return '${generated.substring(0, firstNewline + 1)}${match.group(0)}${generated.substring(firstNewline + 1)}';
+  }
+
+  final rosterFile = File(rosterPath);
+  final emeritusFile = File(emeritusPath);
+  final rosterContent =
+      preservePendingAuditBanner(rosterFile, buildRosterMarkdown(doc, summary));
+  final emeritusContent =
+      preservePendingAuditBanner(emeritusFile, buildEmeritusMarkdown(doc));
+
+  if (isCheck) {
+    final rosterOutOfSync = !rosterFile.existsSync() ||
+        rosterFile.readAsStringSync() != rosterContent;
+    final emeritusOutOfSync = !emeritusFile.existsSync() ||
+        emeritusFile.readAsStringSync() != emeritusContent;
+    if (rosterOutOfSync || emeritusOutOfSync) {
+      print(
+          'Error: ROSTER.md or EMERITUS.md is out of sync with data/contributors.yaml.');
+      print('Run `dart run tool/generate_roster.dart` to update them.');
+      exit(1);
+    }
+    print('ROSTER.md and EMERITUS.md are in sync with data/contributors.yaml.');
+  } else {
+    rosterFile.writeAsStringSync(rosterContent);
+    emeritusFile.writeAsStringSync(emeritusContent);
+    print(
+        'Generated ${rosterFile.path} and ${emeritusFile.path} successfully.');
+  }
+}
+
+List<String> _formatGridRows(List<String> usernames, {int columns = 4}) {
+  final rows = <String>[];
+  for (var i = 0; i < usernames.length; i += columns) {
+    final row = <String>[
+      for (var j = 0; j < columns && i + j < usernames.length; j++)
+        '[@${usernames[i + j]}](https://github.com/${usernames[i + j]})',
+    ];
+    rows.add(row.join(' • '));
+  }
+  return rows;
+}
+
+String buildRosterMarkdown(YamlMap doc, Map<String, dynamic> summary) {
+  final maintainers = doc['maintainers'] as YamlMap?;
+  final allMaintainers = <String>{
+    if (maintainers != null) ...[
+      for (final g in maintainers['googlers'] as YamlList? ?? [])
+        g['username'] as String,
+      for (final p in maintainers['partners'] as YamlList? ?? [])
+        p['username'] as String,
+    ],
+  };
+  final sortedMaintainers = allMaintainers.toList()
+    ..sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+  final maintainerRows = _formatGridRows(sortedMaintainers);
+
+  final committers = doc['committers'] as YamlList? ?? [];
+  final committerRows = <String>[
+    for (final c in committers)
+      () {
+        final username = c['username'] as String;
+        final stats = summary[username] as Map<String, dynamic>?;
+        final prs = stats?['merged_prs'] ?? '-';
+        final total = stats?['total'] ?? '-';
+        return '| @$username | [github.com/$username](https://github.com/$username) | $prs | $total |';
+      }(),
+  ];
+
+  final reviewers = doc['reviewers'] as YamlList? ?? [];
+  final reviewerRows = <String>[
+    for (final r in reviewers)
+      () {
+        final username = r['username'] as String;
+        final stats = summary[username] as Map<String, dynamic>?;
+        final prs = stats?['merged_prs'] ?? '-';
+        final total = stats?['total'] ?? '-';
+        return '| @$username | [github.com/$username](https://github.com/$username) | $prs | $total |';
+      }(),
+  ];
+
+  return '''
+# Contributor Roster
+
+This directory lists active Flutter Contributor Ladder members.
+Honorary alumni who have stepped back from active contribution and exited the GitHub organization are listed in [EMERITUS.md](EMERITUS.md).
+Governance details and tier qualifications are specified in [docs/LADDER.md](docs/LADDER.md).
+
+> [!NOTE]
+> This file is automatically generated from `data/contributors.yaml`.
+> To update, edit `data/contributors.yaml` and run `dart run tool/generate_roster.dart`.
+
+## Maintainers (`@flutter/maintainers`)
+
+Maintainers hold GitHub Write permissions and organization moderation privileges, and belong to `@flutter/maintainers` (a child team of `@flutter/flutter-hackers`).
+
+${maintainerRows.join('\n')}
+
+## Committers (`@flutter/committers`)
+
+Committers hold GitHub Write permissions (merge rights) and provide authoritative code reviews.
+
+| Contributor | GitHub profile | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- |
+${committerRows.join('\n')}
+
+## Reviewers (`@flutter/reviewers`)
+
+Reviewers hold GitHub Triage permissions, triage issues, and conduct first-pass code reviews.
+
+| Contributor | GitHub profile | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- |
+${reviewerRows.join('\n')}
+
+## Dasher Emeritus
+
+Former ladder members who have stepped back from active contribution do not remain in the GitHub organization and are honored in [EMERITUS.md](EMERITUS.md).
+''';
+}
+
+String buildEmeritusMarkdown(YamlMap doc) {
+  final emeriti = doc['dash_emeritus'] as YamlList? ?? [];
+  final sortedEmeriti = emeriti.map((e) => e['username'] as String).toList()
+    ..sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+  final emeritusRows = _formatGridRows(sortedEmeriti);
+
+  return '''
+# Dasher Emeritus
+
+This directory honors **Dasher Emeritus** alumni—former Flutter Reviewers, Committers, and Maintainers who previously held roles on the contributor ladder and have stepped back from active contribution (< 10 contributions over the preceding 12 months).
+
+To maintain repository security, Dasher Emeriti do not remain members of the `flutter` GitHub organization. Instead, their contributions are recognized here, and they retain access to Flutter contributor channels on Discord (including `#hidden-chat`) and the announcement-only `flutter-contributors` Google Group (for project announcements and calendar invites to our recurring Flutter Contributor Roundtable and the Dash Forum, where contributors can present and get feedback on their [RFCs](https://github.com/flutter/rfc); the registration form is pinned in `#hidden-chat` on Discord) so they can stay in touch and more easily ramp back up onto the project if and when they choose to return.
+
+Returning Emeriti who resume contributing are automatically identified during quarterly reviews (where they can reply directly on the public tracking issue). For off-cycle reinstatement, because creating new issues and pull requests in `flutter/contributors` is restricted to organization members (`collaborators`), returning Emeriti can reach out in `#hidden-chat` on Discord (or to an active organization member) to have an active org member sponsor and open a [Dasher Emeritus Reinstatement request](.github/ISSUE_TEMPLATE/2_emeritus_reinstatement.yml) on their behalf (where they can also share an updated Discord username if needed). See [docs/LADDER.md](docs/LADDER.md) for details.
+
+> [!NOTE]
+> This file is automatically generated from `data/contributors.yaml`.
+> To update, edit `data/contributors.yaml` and run `dart run tool/generate_roster.dart`.
+
+## Honored Alumni
+
+${emeritusRows.join('\n')}
+''';
+}
diff --git a/tool/github.dart b/tool/github.dart
index 8322647..0b74090 100644
--- a/tool/github.dart
+++ b/tool/github.dart
@@ -1,4 +1,4 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
+// Copyright 2026 The Flutter Authors.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
diff --git a/tool/process_runner.dart b/tool/process_runner.dart
new file mode 100644
index 0000000..23f5079
--- /dev/null
+++ b/tool/process_runner.dart
@@ -0,0 +1,9 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io' show ProcessResult;
+
+/// Signature for running an external process asynchronously.
+typedef ProcessRunner = Future<ProcessResult> Function(
+    String executable, List<String> arguments);
diff --git a/tool/quarterly_audit.dart b/tool/quarterly_audit.dart
new file mode 100644
index 0000000..ca44532
--- /dev/null
+++ b/tool/quarterly_audit.dart
@@ -0,0 +1,1583 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:args/args.dart';
+import 'package:intl/intl.dart';
+
+import 'bots.dart';
+import 'contributors_roster.dart';
+import 'github.dart';
+import 'process_runner.dart';
+import 'validate_roster.dart';
+
+/// Snapshot of live `flutter` GitHub organization and team membership.
+final class LiveOrgSnapshot {
+  const LiveOrgSnapshot({
+    required this.orgMembers,
+    required this.googlers,
+    required this.partners,
+    required this.partnerTeams,
+    this.collaborators = const {},
+    this.committers = const {},
+    this.reviewers = const {},
+  });
+
+  final Set<String> orgMembers;
+  final Set<String> googlers;
+  final Set<String> partners;
+  final Map<String, String> partnerTeams;
+
+  /// `@flutter/collaborators` is automatically managed by internal tooling and
+  /// contains all organization members who are not Googlers.
+  final Set<String> collaborators;
+  final Set<String> committers;
+  final Set<String> reviewers;
+}
+
+/// Reconciled roster combining `data/contributors.yaml` with live `flutter`
+/// GitHub organization membership so every current org member is audited.
+final class ResolvedRoster {
+  const ResolvedRoster({
+    required this.googlers,
+    required this.partners,
+    required this.committers,
+    required this.reviewers,
+    required this.unassignedOrgMembers,
+    required this.externalEmeriti,
+    this.formerMaintainers = const {},
+    required this.discordByUserLower,
+    required this.graceUntilByUserLower,
+  });
+
+  final List<String> googlers;
+  final List<({String username, String team})> partners;
+  final List<String> committers;
+  final List<({String username, String? graceUntil})> reviewers;
+
+  /// Current `flutter` GitHub org members who are not Maintainers, Committers,
+  /// Reviewers, or bots (e.g. legacy org members pending Emeritus removal or
+  /// members added to the org outside `committers`/`reviewers`).
+  final List<String> unassignedOrgMembers;
+
+  /// Dasher Emeriti in `data/contributors.yaml` who are no longer members of
+  /// the `flutter` GitHub organization.
+  final List<String> externalEmeriti;
+
+  /// Former Maintainers from `data/contributors.yaml` who have left
+  /// `@flutter/googlers` or `@flutter/partners` and exited the GitHub org.
+  final Set<String> formerMaintainers;
+
+  final Map<String, String> discordByUserLower;
+  final Map<String, String> graceUntilByUserLower;
+}
+
+/// Queries live `flutter` GitHub organization and team membership so no current
+/// org member slips through an audit.
+Future<LiveOrgSnapshot?> fetchLiveOrgSnapshot(GitHubClient client) async {
+  try {
+    await loadRobotTeams(client);
+    final orgMembers = await client.getOrgMembers('flutter');
+    if (orgMembers.isEmpty) return null;
+    final googlers = await client.getTeamMembers('flutter', 'googlers');
+    final partners = await client.getTeamMembers('flutter', 'partners');
+    final collaborators =
+        await client.getTeamMembers('flutter', 'collaborators');
+    final partnerTeams = <String, String>{};
+    try {
+      final childSlugs = await client.getChildTeams('flutter', 'partners');
+      for (final slug in childSlugs) {
+        final members = await client.getTeamMembers('flutter', slug);
+        for (final m in members) {
+          partnerTeams[m.toLowerCase()] = '@flutter/$slug';
+        }
+      }
+    } catch (e) {
+      stderr.writeln(
+          'Notice: Could not resolve @flutter/partners child teams: $e');
+    }
+    final committers = await client.getTeamMembers('flutter', 'committers');
+    final reviewers = await client.getTeamMembers('flutter', 'reviewers');
+    return LiveOrgSnapshot(
+      orgMembers: orgMembers,
+      googlers: googlers,
+      partners: partners,
+      partnerTeams: partnerTeams,
+      collaborators: collaborators,
+      committers: committers,
+      reviewers: reviewers,
+    );
+  } catch (e) {
+    stderr.writeln(
+        'Notice: Could not query live Flutter GitHub org ($e); falling back to data/contributors.yaml.');
+    return null;
+  }
+}
+
+/// Reconciles `data/contributors.yaml` ([doc]) with [liveOrg] so that 100% of
+/// current `flutter` GitHub organization members are categorized and evaluated.
+ResolvedRoster reconcileRosterState(
+  ContributorsRoster doc, {
+  LiveOrgSnapshot? liveOrg,
+  DateTime? referenceDate,
+}) {
+  final now = (referenceDate ?? DateTime.now()).toUtc();
+  final todayUtc = DateTime.utc(now.year, now.month, now.day);
+
+  final discordByUserLower = <String, String>{};
+  final graceUntilByUserLower = <String, String>{};
+  final yamlPartnerTeamsLower = <String, String>{};
+  final canonicalNameLower = <String, String>{};
+
+  void recordMetadata(ContributorEntry entry) {
+    final u = entry.username;
+    if (u.isEmpty) return;
+    final lower = u.toLowerCase();
+    canonicalNameLower.putIfAbsent(lower, () => u);
+    final d = entry.discord;
+    final g = entry.graceUntil;
+    if (d != null && d.isNotEmpty) {
+      discordByUserLower[lower] = d;
+    }
+    if (g != null && g.isNotEmpty) {
+      final parsed = DateTime.tryParse(g);
+      if (parsed != null && !parsed.isBefore(todayUtc)) {
+        graceUntilByUserLower[lower] = g;
+      }
+    }
+  }
+
+  final yamlMaintainersLower = <String>{};
+  for (final g in doc.maintainers.googlers) {
+    recordMetadata(g);
+    if (g.username.isNotEmpty) {
+      yamlMaintainersLower.add(g.username.toLowerCase());
+    }
+  }
+  for (final p in doc.maintainers.partners) {
+    recordMetadata(p);
+    if (p.username.isNotEmpty) {
+      final lower = p.username.toLowerCase();
+      yamlMaintainersLower.add(lower);
+      if (p.team != null) {
+        yamlPartnerTeamsLower[lower] = p.team!;
+      }
+    }
+  }
+  for (final entry in [
+    ...doc.committers,
+    ...doc.reviewers,
+    ...doc.dashEmeritus,
+  ]) {
+    recordMetadata(entry);
+  }
+
+  final seenMaintainersLower = <String>{};
+
+  // 1. Partners (@flutter/partners)
+  final partners = <({String username, String team})>[];
+  if (liveOrg != null && liveOrg.partners.isNotEmpty) {
+    for (final u in liveOrg.partners) {
+      if (isExcludedAccount(u)) continue;
+      final lower = u.toLowerCase();
+      if (!seenMaintainersLower.add(lower)) continue;
+      final team = liveOrg.partnerTeams[lower] ??
+          yamlPartnerTeamsLower[lower] ??
+          '@flutter/partners';
+      partners.add((username: canonicalNameLower[lower] ?? u, team: team));
+    }
+  } else {
+    for (final p in doc.maintainers.partners) {
+      final u = p.username;
+      if (u.isEmpty || isExcludedAccount(u)) continue;
+      final lower = u.toLowerCase();
+      if (!seenMaintainersLower.add(lower)) continue;
+      partners.add((
+        username: u,
+        team: p.team ?? '@flutter/partners',
+      ));
+    }
+  }
+  partners.sort(
+      (a, b) => a.username.toLowerCase().compareTo(b.username.toLowerCase()));
+
+  // 2. Googlers (@flutter/googlers + known_maintainers.txt, excluding Partners)
+  final googlers = <String>[];
+  final googlerCandidates = <String>[
+    if (liveOrg != null && liveOrg.googlers.isNotEmpty)
+      ...liveOrg.googlers
+    else
+      for (final g in doc.maintainers.googlers) g.username,
+    ...loadKnownExceptionMaintainers(),
+  ];
+  for (final u in googlerCandidates) {
+    if (u.isEmpty || isExcludedAccount(u)) continue;
+    final lower = u.toLowerCase();
+    if (seenMaintainersLower.add(lower)) {
+      googlers.add(canonicalNameLower[lower] ?? u);
+    }
+  }
+  googlers.sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+
+  // 3. Committers & Reviewers
+  final seenCommunityLower = <String>{};
+  final committers = <String>[];
+  final committerCandidates = <String>[
+    for (final c in doc.committers) c.username,
+    if (liveOrg != null) ...liveOrg.committers,
+  ];
+  for (final u in committerCandidates) {
+    if (u.isEmpty || isExcludedAccount(u)) continue;
+    final lower = u.toLowerCase();
+    if (seenMaintainersLower.contains(lower)) continue;
+    if (seenCommunityLower.add(lower)) {
+      committers.add(canonicalNameLower[lower] ?? u);
+    }
+  }
+  committers.sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+
+  final reviewers = <({String username, String? graceUntil})>[];
+  final reviewerCandidates = <String>[
+    for (final r in doc.reviewers) r.username,
+    if (liveOrg != null) ...liveOrg.reviewers,
+  ];
+  for (final u in reviewerCandidates) {
+    if (u.isEmpty || isExcludedAccount(u)) continue;
+    final lower = u.toLowerCase();
+    if (seenMaintainersLower.contains(lower) ||
+        seenCommunityLower.contains(lower)) {
+      continue;
+    }
+    if (seenCommunityLower.add(lower)) {
+      reviewers.add((
+        username: canonicalNameLower[lower] ?? u,
+        graceUntil: graceUntilByUserLower[lower],
+      ));
+    }
+  }
+  reviewers.sort(
+      (a, b) => a.username.toLowerCase().compareTo(b.username.toLowerCase()));
+
+  // 4. All other non-Maintainer, non-bot members currently in the `flutter` GitHub org
+  // Note: `@flutter/collaborators` is automatically managed by internal tooling for
+  // non-Googler org members, though due to an internal sync issue the known exception
+  // Googlers in `known_maintainers.txt` also appear in `@flutter/collaborators` and
+  // are already excluded via `seenMaintainersLower` above.
+  final unassignedOrgMembers = <String>[];
+  if (liveOrg != null &&
+      (liveOrg.orgMembers.isNotEmpty || liveOrg.collaborators.isNotEmpty)) {
+    for (final u in [...liveOrg.orgMembers, ...liveOrg.collaborators]) {
+      if (isExcludedAccount(u)) continue;
+      final lower = u.toLowerCase();
+      if (seenMaintainersLower.contains(lower) ||
+          seenCommunityLower.contains(lower)) {
+        continue;
+      }
+      if (seenCommunityLower.add(lower)) {
+        unassignedOrgMembers.add(canonicalNameLower[lower] ?? u);
+      }
+    }
+  }
+  unassignedOrgMembers
+      .sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+
+  // 5. External Dasher Emeriti (no longer in the `flutter` GitHub org)
+  final externalEmeriti = <String>[];
+  for (final e in doc.dashEmeritus) {
+    final u = e.username;
+    if (u.isEmpty || isExcludedAccount(u)) continue;
+    final lower = u.toLowerCase();
+    if (seenMaintainersLower.contains(lower) ||
+        seenCommunityLower.contains(lower)) {
+      continue;
+    }
+    // If liveOrg is present and this dash_emeritus entry is no longer in the
+    // live org and has 0 activity, check if they were a renamed account or
+    // genuine Emeritus alumni.
+    if (seenCommunityLower.add(lower)) {
+      externalEmeriti.add(u);
+    }
+  }
+  externalEmeriti.sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+
+  final formerMaintainers = yamlMaintainersLower
+      .difference(seenMaintainersLower)
+      .difference(seenCommunityLower);
+
+  return ResolvedRoster(
+    googlers: googlers,
+    partners: partners,
+    committers: committers,
+    reviewers: reviewers,
+    unassignedOrgMembers: unassignedOrgMembers,
+    externalEmeriti: externalEmeriti,
+    formerMaintainers: formerMaintainers,
+    discordByUserLower: discordByUserLower,
+    graceUntilByUserLower: graceUntilByUserLower,
+  );
+}
+
+void main(List<String> args) async {
+  final parser = ArgParser()
+    ..addFlag('prepare',
+        help:
+            'Run the full local kickoff: vet nominated candidates against the ban list, generate reports, and update the roster for a single PR',
+        defaultsTo: false)
+    ..addFlag('community',
+        help: 'Generate Community Contributor Ladder Audit Report',
+        defaultsTo: false)
+    ..addFlag('partners',
+        help: 'Generate Partner Affiliation Verification Audit Report',
+        defaultsTo: false)
+    ..addFlag('save',
+        help: 'Save generated report into reports/ directory',
+        defaultsTo: false)
+    ..addFlag('draft-issues',
+        help:
+            'Output drafted issue bodies and gh CLI commands based on the generated reports to start the 30-day review period',
+        defaultsTo: false)
+    ..addFlag('open-issues',
+        help:
+            'Open the public Community Review and Partner Verification issues on GitHub using the generated reports',
+        defaultsTo: false)
+    ..addFlag('finalize',
+        help:
+            'Apply verified audit changes (e.g. after the 30-day grace period) to data/contributors.yaml, ROSTER.md, and EMERITUS.md',
+        defaultsTo: false)
+    ..addFlag('dry-run',
+        help:
+            'Preview changes without modifying files on disk or opening GitHub issues',
+        defaultsTo: false)
+    ..addFlag('offline',
+        help:
+            'Skip querying live Flutter GitHub organization membership and use only local files',
+        defaultsTo: false)
+    ..addFlag('no-prompt',
+        help: 'Disable interactive terminal prompts during --prepare',
+        defaultsTo: false)
+    ..addOption('retain',
+        help:
+            'Comma-separated usernames to retain in their current role (e.g. verified qualitative contributions)')
+    ..addOption('exclude',
+        help:
+            'Comma-separated usernames to exclude from promotion, reinstatement, or invitation (e.g. prior ban history or declined invite)')
+    ..addOption('discord',
+        help:
+            'Comma-separated user=discord_handle mappings to record in contributors.yaml')
+    ..addOption('pr',
+        help:
+            'Optional PR URL or number to link in the drafted/opened review issues')
+    ..addOption('contributors',
+        help: 'Path to contributors YAML file',
+        defaultsTo: 'data/contributors.yaml')
+    ..addOption('summary',
+        help: 'Path to activity summary JSON file',
+        defaultsTo: 'data/activity_summary.json')
+    ..addOption('output',
+        abbr: 'o',
+        help:
+            'Output file path for generated report (prints to stdout if omitted)');
+
+  final results = parser.parse(args);
+  final isPrepare = results['prepare'] as bool;
+  final isCommunity = results['community'] as bool;
+  final isPartners = results['partners'] as bool;
+  final isSave = results['save'] as bool;
+  final isDraftIssues = results['draft-issues'] as bool;
+  final isOpenIssues = results['open-issues'] as bool;
+  final isFinalize = results['finalize'] as bool;
+  final isDryRun = results['dry-run'] as bool;
+  final isOffline = results['offline'] as bool;
+  final noPrompt = results['no-prompt'] as bool;
+  final retainArg = results['retain'] as String?;
+  final excludeArg = results['exclude'] as String?;
+  final discordArg = results['discord'] as String?;
+  final prArg = results['pr'] as String?;
+  final contributorsPath = results['contributors'] as String;
+  final summaryPath = results['summary'] as String;
+  var outputPath = results['output'] as String?;
+
+  if (!isPrepare &&
+      !isCommunity &&
+      !isPartners &&
+      !isDraftIssues &&
+      !isOpenIssues &&
+      !isFinalize) {
+    print(
+        'Usage: dart run tool/quarterly_audit.dart [--prepare | --community | --partners | --draft-issues | --open-issues | --finalize] [--save] [--dry-run] [--offline] [--retain u1,u2] [--exclude u1,u2] [--discord u1=d1] [--pr <PR_URL>]');
+    exit(1);
+  }
+
+  final contributorsYamlFile = File(contributorsPath);
+  if (!contributorsYamlFile.existsSync()) {
+    print(
+        'Error: $contributorsPath not found. Run `dart run tool/seed_initial_data.dart` first.');
+    exit(1);
+  }
+
+  final summaryFile = File(summaryPath);
+  var summary = <String, dynamic>{};
+  if (summaryFile.existsSync()) {
+    try {
+      summary =
+          jsonDecode(summaryFile.readAsStringSync()) as Map<String, dynamic>;
+    } catch (e) {
+      print('Warning: Failed to parse $summaryPath: $e');
+    }
+  }
+
+  final doc = ContributorsRoster.parse(contributorsYamlFile.readAsStringSync());
+  final now = DateTime.now().toUtc();
+  final quarter = 'Q${((now.month - 1) ~/ 3) + 1} ${now.year}';
+  final quarterSlug = '${now.year}-Q${((now.month - 1) ~/ 3) + 1}';
+
+  final reportsDir = Directory('reports');
+  if (!reportsDir.existsSync()) {
+    reportsDir.createSync(recursive: true);
+  }
+
+  final retainedUsers = _parseUserSet(retainArg);
+  final excludedUsers = _parseUserSet(excludeArg);
+  final discordOverrides = _parseDiscordMap(discordArg);
+
+  // Query live Flutter GitHub organization membership by default when operating
+  // on the primary roster so no current org member slips through.
+  LiveOrgSnapshot? liveOrg;
+  if (!isOffline && contributorsPath == 'data/contributors.yaml') {
+    final client = GitHubClient();
+    try {
+      liveOrg = await fetchLiveOrgSnapshot(client);
+    } finally {
+      client.close();
+    }
+  }
+
+  final roster =
+      reconcileRosterState(doc, liveOrg: liveOrg, referenceDate: now);
+
+  if (isPrepare) {
+    _runPrepare(
+      roster,
+      summary,
+      contributorsFile: contributorsYamlFile,
+      quarter: quarter,
+      quarterSlug: quarterSlug,
+      retainedUsers: retainedUsers,
+      excludedUsers: excludedUsers,
+      discordOverrides: discordOverrides,
+      isDryRun: isDryRun,
+      allowPrompt: !noPrompt && excludeArg == null && stdin.hasTerminal,
+    );
+    return;
+  }
+
+  if (isCommunity) {
+    if (isSave && outputPath == null) {
+      outputPath = 'reports/$quarterSlug-community-ladder-audit.md';
+    }
+    final report = generateCommunityReport(
+      roster,
+      summary,
+      excludedUsers: excludedUsers,
+      retainedUsers: retainedUsers,
+      prLink: prArg,
+    );
+    _outputReport(report, outputPath);
+  } else if (isPartners) {
+    if (isSave && outputPath == null) {
+      outputPath = 'reports/$quarterSlug-partner-verification-audit.md';
+    }
+    final report = generatePartnersReport(roster, summary, prLink: prArg);
+    _outputReport(report, outputPath);
+  } else if (isFinalize) {
+    final communityReportFile =
+        File('reports/$quarterSlug-community-ladder-audit.md');
+    _finalizeAudit(
+      roster,
+      summary,
+      contributorsFile: contributorsYamlFile,
+      retainedUsers: retainedUsers,
+      excludedUsers: excludedUsers,
+      discordOverrides: discordOverrides,
+      isDryRun: isDryRun,
+      existingCommunityReportFile:
+          communityReportFile.existsSync() ? communityReportFile : null,
+    );
+  }
+
+  if (isDraftIssues || isOpenIssues) {
+    await handleReviewIssues(
+      roster,
+      summary,
+      quarter: quarter,
+      quarterSlug: quarterSlug,
+      excludedUsers: excludedUsers,
+      retainedUsers: retainedUsers,
+      prLink: prArg,
+      openOnGitHub: isOpenIssues,
+      isDryRun: isDryRun,
+    );
+  }
+}
+
+/// Interactive/CLI kickoff helper that lists nominated candidates for manual
+/// ban-history verification, generates both quarterly reports (omitting any
+/// excluded users), and updates `data/contributors.yaml`, `ROSTER.md`, and
+/// `EMERITUS.md` so the facilitator only needs to open a single PR.
+void _runPrepare(
+  ResolvedRoster roster,
+  Map<String, dynamic> summary, {
+  required File contributorsFile,
+  required String quarter,
+  required String quarterSlug,
+  required Set<String> retainedUsers,
+  required Set<String> excludedUsers,
+  required Map<String, String> discordOverrides,
+  required bool isDryRun,
+  required bool allowPrompt,
+}) {
+  print('=== Quarterly Contributor Ladder Audit Preparation ($quarter) ===\n');
+
+  final nominees = collectNominatedCandidates(roster, summary);
+  if (nominees.isEmpty) {
+    print('No new promotions, reinstatements, or prospective joiners found.');
+  } else {
+    print(
+        'Nominated candidates for promotion, reinstatement, or invitation (${nominees.length}):');
+    for (final n in nominees) {
+      print(
+          '  • @${n.username} (${n.currentStatus} -> ${n.recommendedRole}: ${n.mergedPrs} PRs, ${n.total} total)');
+    }
+    print('');
+    print(
+        'ACTION REQUIRED: Check the ${nominees.length} username(s) above against the internal Code of Conduct / ban history list.');
+    if (allowPrompt) {
+      stdout.write(
+          'Enter any usernames to exclude (comma-separated, or press Enter for none): ');
+      final input = stdin.readLineSync();
+      excludedUsers.addAll(_parseUserSet(input));
+    }
+  }
+
+  if (excludedUsers.isNotEmpty) {
+    print(
+        'Excluding from promotion/invitation (omitted from report & roster): ${excludedUsers.join(", ")}');
+  }
+
+  final communityPath = 'reports/$quarterSlug-community-ladder-audit.md';
+  final partnerPath = 'reports/$quarterSlug-partner-verification-audit.md';
+
+  final communityReport = generateCommunityReport(
+    roster,
+    summary,
+    excludedUsers: excludedUsers,
+    retainedUsers: retainedUsers,
+  );
+  final partnerReport = generatePartnersReport(roster, summary);
+
+  if (isDryRun) {
+    print('\n[DRY RUN] Would write reports to:');
+    print('  • $communityPath');
+    print('  • $partnerPath');
+  } else {
+    File(communityPath).writeAsStringSync(communityReport);
+    File(partnerPath).writeAsStringSync(partnerReport);
+    print('\nSaved vetted quarterly reports:');
+    print('  • $communityPath');
+    print('  • $partnerPath');
+  }
+
+  print('');
+  _finalizeAudit(
+    roster,
+    summary,
+    contributorsFile: contributorsFile,
+    retainedUsers: retainedUsers,
+    excludedUsers: excludedUsers,
+    discordOverrides: discordOverrides,
+    isDryRun: isDryRun,
+  );
+
+  print('\n=== Next Steps ===');
+  print(
+      '1. Open 1 PR with the reports and roster updates (hold open for the 30-day review period):');
+  print('   git add reports/ data/contributors.yaml ROSTER.md EMERITUS.md');
+  print(
+      '   git commit -m "chore: $quarter quarterly contributor ladder review"');
+  print(
+      '2. Start the 30-day community review period by drafting or opening the public issues:');
+  print('   dart run tool/quarterly_audit.dart --draft-issues --pr <PR_URL>');
+  print('   dart run tool/quarterly_audit.dart --open-issues --pr <PR_URL>');
+  print(
+      '3. After 30 days, update the PR branch with any review adjustments and merge it:');
+  print(
+      '   dart run tool/quarterly_audit.dart --finalize --retain u1,u2 --exclude u3 --discord new_user=handle');
+}
+
+/// Drafts or opens the public Community Ladder Audit and Partner Verification
+/// issues on GitHub using the vetted report files.
+Future<void> handleReviewIssues(
+  ResolvedRoster roster,
+  Map<String, dynamic> summary, {
+  required String quarter,
+  required String quarterSlug,
+  required Set<String> excludedUsers,
+  required Set<String> retainedUsers,
+  required String? prLink,
+  required bool openOnGitHub,
+  required bool isDryRun,
+  ProcessRunner runProcess = Process.run,
+}) async {
+  final communityFile = File('reports/$quarterSlug-community-ladder-audit.md');
+  final partnerFile =
+      File('reports/$quarterSlug-partner-verification-audit.md');
+
+  var communityBody = communityFile.existsSync()
+      ? communityFile.readAsStringSync()
+      : generateCommunityReport(
+          roster,
+          summary,
+          excludedUsers: excludedUsers,
+          retainedUsers: retainedUsers,
+          prLink: prLink,
+        );
+  var partnerBody = partnerFile.existsSync()
+      ? partnerFile.readAsStringSync()
+      : generatePartnersReport(roster, summary, prLink: prLink);
+
+  if (prLink != null && prLink.trim().isNotEmpty) {
+    final prLine =
+        '> **Proposed roster & report PR:** ${_formatPrReference(prLink)}  \n';
+    if (!communityBody.contains('Proposed roster & report PR:')) {
+      communityBody = communityBody.replaceFirst(
+        '> **Governance reference:**',
+        '$prLine> **Governance reference:**',
+      );
+    }
+    if (!partnerBody.contains('Proposed roster & report PR:')) {
+      partnerBody = partnerBody.replaceFirst(
+        '> **Governance reference:**',
+        '$prLine> **Governance reference:**',
+      );
+    }
+  }
+
+  final communityTitle =
+      '[Quarterly Review]: $quarter Community Contributor Ladder Audit';
+  final partnerTitle =
+      '[Quarterly Review]: $quarter Partner Team Verification Audit';
+
+  if (!openOnGitHub || isDryRun) {
+    print('=== Drafted Quarterly Review Issues ($quarter) ===\n');
+    print('1. Community Audit Issue:');
+    print('   Title:  $communityTitle');
+    print('   Labels: quarterly-review,community-audit');
+    print(
+      '   Command: gh issue create --title "$communityTitle" --body-file ${communityFile.path} --label "quarterly-review,community-audit" --assignee "Piinks"\n',
+    );
+    print('2. Partner Verification Issue:');
+    print('   Title:  $partnerTitle');
+    print('   Labels: quarterly-review,partner-audit');
+    print(
+      '   Command: gh issue create --title "$partnerTitle" --body-file ${partnerFile.path} --label "quarterly-review,partner-audit" --assignee "Piinks"\n',
+    );
+    print('--- Community Issue Body Preview ---');
+    print(communityBody);
+    print('--- Partner Issue Body Preview ---');
+    print(partnerBody);
+    return;
+  }
+
+  // Ensure labels exist
+  const labels = [
+    (
+      'quarterly-review',
+      'Quarterly Contributor Ladder Review',
+      '1D76DB',
+    ),
+    (
+      'community-audit',
+      'Community Contributor Ladder Audit',
+      '0E8A16',
+    ),
+    (
+      'partner-audit',
+      'Partner Team Verification Audit',
+      '5319E7',
+    ),
+    (
+      'grace-period-concluded',
+      '30-day review period elapsed',
+      'FBCA04',
+    ),
+  ];
+  for (final l in labels) {
+    await runProcess('gh', [
+      'label',
+      'create',
+      l.$1,
+      '--description',
+      l.$2,
+      '--color',
+      l.$3,
+      '--force',
+    ]);
+  }
+
+  final commResult = await runProcess('gh', [
+    'issue',
+    'create',
+    '--title',
+    communityTitle,
+    '--body',
+    communityBody,
+    '--label',
+    'quarterly-review,community-audit',
+    '--assignee',
+    'Piinks',
+  ]);
+  if (commResult.exitCode == 0) {
+    print(
+      'Created Community Audit Issue: ${(commResult.stdout as String).trim()}',
+    );
+  } else {
+    print('Failed to create Community Audit Issue: ${commResult.stderr}');
+  }
+
+  final partResult = await runProcess('gh', [
+    'issue',
+    'create',
+    '--title',
+    partnerTitle,
+    '--body',
+    partnerBody,
+    '--label',
+    'quarterly-review,partner-audit',
+    '--assignee',
+    'Piinks',
+  ]);
+  if (partResult.exitCode == 0) {
+    print(
+      'Created Partner Verification Issue: ${(partResult.stdout as String).trim()}',
+    );
+  } else {
+    print('Failed to create Partner Verification Issue: ${partResult.stderr}');
+  }
+}
+
+List<
+    ({
+      String username,
+      String currentStatus,
+      String recommendedRole,
+      int mergedPrs,
+      int total,
+    })> collectNominatedCandidates(
+  ResolvedRoster roster,
+  Map<String, dynamic> summary,
+) {
+  final nominees = <({
+    String username,
+    String currentStatus,
+    String recommendedRole,
+    int mergedPrs,
+    int total,
+  })>[];
+
+  for (final r in roster.reviewers) {
+    final username = r.username;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    if (total >= 30 && prs >= 10) {
+      nominees.add((
+        username: username,
+        currentStatus: 'Reviewer',
+        recommendedRole: 'Committer',
+        mergedPrs: prs,
+        total: total,
+      ));
+    }
+  }
+
+  for (final username in roster.unassignedOrgMembers) {
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    if (total >= 10) {
+      final role = (total >= 30 && prs >= 10) ? 'Committer' : 'Reviewer';
+      nominees.add((
+        username: username,
+        currentStatus: 'Org Member',
+        recommendedRole: role,
+        mergedPrs: prs,
+        total: total,
+      ));
+    }
+  }
+
+  for (final username in roster.externalEmeriti) {
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    if (total >= 10) {
+      final role = (total >= 30 && prs >= 10) ? 'Committer' : 'Reviewer';
+      nominees.add((
+        username: username,
+        currentStatus: 'Dasher Emeritus',
+        recommendedRole: '$role (Reinstatement)',
+        mergedPrs: prs,
+        total: total,
+      ));
+    }
+  }
+
+  final externalCandidates = _discoverExternalCandidates(roster, summary);
+  for (final username in externalCandidates) {
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    final role = (total >= 30 && prs >= 10) ? 'Committer' : 'Reviewer';
+    nominees.add((
+      username: username,
+      currentStatus: 'External Contributor',
+      recommendedRole: '$role (Invitation)',
+      mergedPrs: prs,
+      total: total,
+    ));
+  }
+
+  return nominees;
+}
+
+Map<String, String> _parseDiscordMap(String? raw) {
+  if (raw == null || raw.trim().isEmpty) return {};
+  final map = <String, String>{};
+  for (final pair in raw.split(',')) {
+    final parts = pair.split('=');
+    if (parts.length == 2) {
+      final user = parts[0].trim().replaceAll('@', '').toLowerCase();
+      final discord = parts[1].trim();
+      if (user.isNotEmpty && discord.isNotEmpty) {
+        map[user] = discord;
+      }
+    }
+  }
+  return map;
+}
+
+Set<String> _parseUserSet(String? raw) {
+  if (raw == null || raw.trim().isEmpty) return {};
+  return raw
+      .split(',')
+      .map((s) => s.trim().replaceAll('@', '').toLowerCase())
+      .where((s) => s.isNotEmpty)
+      .toSet();
+}
+
+/// Collects all lowercase usernames currently tracked in the resolved roster.
+Set<String> _collectEnrolledAndEmeritusLower(ResolvedRoster roster) {
+  return <String>{
+    ...loadKnownExceptionMaintainers().map((u) => u.toLowerCase()),
+    ...roster.googlers.map((u) => u.toLowerCase()),
+    ...roster.partners.map((p) => p.username.toLowerCase()),
+    ...roster.committers.map((u) => u.toLowerCase()),
+    ...roster.reviewers.map((r) => r.username.toLowerCase()),
+    ...roster.unassignedOrgMembers.map((u) => u.toLowerCase()),
+    ...roster.externalEmeriti.map((u) => u.toLowerCase()),
+    ...roster.formerMaintainers,
+  };
+}
+
+/// Discovers unenrolled external contributors who have >= 10 qualifying
+/// contributions in [summary].
+List<String> _discoverExternalCandidates(
+    ResolvedRoster roster, Map<String, dynamic> summary) {
+  final enrolledOrEmeritus = _collectEnrolledAndEmeritusLower(roster);
+  final seenLower = <String>{};
+  final candidates = <String>[];
+
+  for (final entry in summary.entries) {
+    final username = entry.key;
+    if (isExcludedAccount(username)) continue;
+    final lower = username.toLowerCase();
+    if (enrolledOrEmeritus.contains(lower) || seenLower.contains(lower)) {
+      continue;
+    }
+    final stats = entry.value as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    if (total >= 10) {
+      seenLower.add(lower);
+      candidates.add(username);
+    }
+  }
+
+  candidates.sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+  return candidates;
+}
+
+/// Returns true if the Reviewer entry [r] has an active one-time Year 1
+/// transition carve-out (`grace_until` date on or after [now]). Once the
+/// initial 12-month launch transition window passes, this naturally expires.
+bool hasActiveRecentJoinerCarveOut(ContributorEntry r, DateTime now) {
+  return _isGraceDateActive(r.graceUntil, now);
+}
+
+bool _isGraceDateActive(String? graceUntilStr, DateTime now) {
+  if (graceUntilStr == null || graceUntilStr.trim().isEmpty) return false;
+  final graceUntil = DateTime.tryParse(graceUntilStr.trim());
+  if (graceUntil == null) return false;
+  final todayUtc = DateTime.utc(now.year, now.month, now.day);
+  return !graceUntil.isBefore(todayUtc);
+}
+
+String _formatPrReference(String prLink) {
+  final trimmed = prLink.trim();
+  if (trimmed.startsWith('http://') || trimmed.startsWith('https://')) {
+    return '<$trimmed>';
+  }
+  return trimmed;
+}
+
+String _formatTableRowsBlock(List<String> rows) =>
+    rows.isEmpty ? '' : '\n${rows.join('\n')}';
+
+String generateCommunityReport(
+  ResolvedRoster roster,
+  Map<String, dynamic> summary, {
+  Set<String> excludedUsers = const {},
+  Set<String> retainedUsers = const {},
+  String? prLink,
+}) {
+  final now = DateTime.now().toUtc();
+  final oneYearAgo = now.subtract(const Duration(days: 365));
+  final graceDeadline = now.add(const Duration(days: 30));
+  final quarter = 'Q${((now.month - 1) ~/ 3) + 1} ${now.year}';
+  final dateFmt = DateFormat('MMMM d, yyyy');
+  final prLineBlock = (prLink != null && prLink.trim().isNotEmpty)
+      ? '\n> **Proposed roster & report PR:** ${_formatPrReference(prLink)}  '
+      : '';
+
+  // 1. Recommended Promotions & New Community Joiners
+  final promotionRows = <String>[];
+  for (final r in roster.reviewers) {
+    final username = r.username;
+    if (excludedUsers.contains(username.toLowerCase())) continue;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    if (total >= 30 && prs >= 10) {
+      promotionRows
+          .add('| @$username | Reviewer | **Committer** | $prs | $total |');
+    }
+  }
+  for (final username in roster.unassignedOrgMembers) {
+    if (excludedUsers.contains(username.toLowerCase())) continue;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    if (total >= 10) {
+      final role = (total >= 30 && prs >= 10) ? 'Committer' : 'Reviewer';
+      promotionRows
+          .add('| @$username | Org Member | **$role** | $prs | $total |');
+    }
+  }
+  for (final username in roster.externalEmeriti) {
+    if (excludedUsers.contains(username.toLowerCase())) continue;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    if (total >= 10) {
+      final role = (total >= 30 && prs >= 10) ? 'Committer' : 'Reviewer';
+      promotionRows.add(
+        '| @$username | Dasher Emeritus | **$role** (Reinstatement) | $prs | $total |',
+      );
+    }
+  }
+  final externalCandidates = _discoverExternalCandidates(roster, summary);
+  for (final username in externalCandidates) {
+    if (excludedUsers.contains(username.toLowerCase())) continue;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    final role = (total >= 30 && prs >= 10) ? 'Committer' : 'Reviewer';
+    promotionRows.add(
+      '| @$username | External Contributor | **$role** (Invitation) | $prs | $total |',
+    );
+  }
+
+  // 2. Active Role Retention
+  final retentionRows = <String>[];
+  for (final username in roster.committers) {
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    if (total >= 10 || retainedUsers.contains(username.toLowerCase())) {
+      retentionRows.add('| @$username | Committer | $prs | $total |');
+    }
+  }
+  for (final r in roster.reviewers) {
+    final username = r.username;
+    final lower = username.toLowerCase();
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    final isPromoted =
+        total >= 30 && prs >= 10 && !excludedUsers.contains(lower);
+    if ((total >= 10 || retainedUsers.contains(lower)) && !isPromoted) {
+      retentionRows.add('| @$username | Reviewer | $prs | $total |');
+    } else if (total < 10 &&
+        !retainedUsers.contains(lower) &&
+        _isGraceDateActive(r.graceUntil, now)) {
+      retentionRows.add(
+        '| @$username | Reviewer (12m recent-joiner carve-out) | $prs | $total |',
+      );
+    }
+  }
+  for (final username in roster.unassignedOrgMembers) {
+    final lower = username.toLowerCase();
+    if (!retainedUsers.contains(lower)) continue;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    if (total < 10) {
+      retentionRows.add('| @$username | Reviewer | $prs | $total |');
+    }
+  }
+
+  // 3. 30-Day Grace Period
+  final gracePeriodRows = <String>[];
+  for (final username in roster.committers) {
+    if (retainedUsers.contains(username.toLowerCase())) continue;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    if (total < 10) {
+      gracePeriodRows
+          .add('| @$username | Committer | $total | In grace period |');
+    }
+  }
+  for (final r in roster.reviewers) {
+    final username = r.username;
+    if (retainedUsers.contains(username.toLowerCase())) continue;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    if (total < 10 && !_isGraceDateActive(r.graceUntil, now)) {
+      gracePeriodRows
+          .add('| @$username | Reviewer | $total | In grace period |');
+    }
+  }
+  for (final username in roster.unassignedOrgMembers) {
+    if (retainedUsers.contains(username.toLowerCase())) continue;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    if (total < 10) {
+      gracePeriodRows
+          .add('| @$username | Org Member | $total | In grace period |');
+    }
+  }
+
+  final promotionBlock = _formatTableRowsBlock(promotionRows);
+  final retentionBlock = _formatTableRowsBlock(retentionRows);
+  final gracePeriodBlock = _formatTableRowsBlock(gracePeriodRows);
+
+  return '''
+# Quarterly Community Contributor Ladder Audit ($quarter)
+
+> **Audit date:** ${dateFmt.format(now)}  
+> **12-month evaluation window:** ${dateFmt.format(oneYearAgo)} – ${dateFmt.format(now)}  
+> **30-day grace period deadline:** ${dateFmt.format(graceDeadline)}  $prLineBlock
+> **Governance reference:** [docs/LADDER.md](docs/LADDER.md) • [docs/QUARTERLY_REVIEW.md](docs/QUARTERLY_REVIEW.md)
+
+This issue tracks the $quarter Flutter Contributor Ladder review and starts the 30-day community review period.
+
+## Recommended promotions and new joiners
+
+The following contributors qualify for role advancement or invitation to the ladder.
+If you are listed below, please reply in this thread to accept your invitation or promotion and share your **Discord username** (if you do not already have the Discord team member role) so we can grant you team member channel access:
+
+| Contributor | Current status | Recommended role | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- | :--- |$promotionBlock
+
+## Active role retention
+
+The following community members met their 12-month role criteria and retain their roles:
+
+| Contributor | Role | 12m merged PRs | 12m total activity |
+| :--- | :--- | :--- | :--- |$retentionBlock
+
+## 30-day grace period
+
+The following members had < 10 contributions recorded in the last 12 months.
+If you are listed below, you have 30 days to respond in this thread with any contributions that cannot be quantified automatically (issue triage, reproductions, [RFCs](https://github.com/flutter/rfc), mentoring).
+
+| Contributor | Current role | 12m total activity | Status |
+| :--- | :--- | :--- | :--- |$gracePeriodBlock
+
+## Qualitative contributions
+
+If you contributed through work not reflected in automated PR counts:
+
+- Verifying issue reproductions, closing obsolete issues, and issue triage
+- Reviewing design docs and [RFCs](https://github.com/flutter/rfc)
+- Mentoring contributors or helping in Discord
+
+Please leave a comment below with links or details before this review concludes on **${dateFmt.format(graceDeadline)}**.
+''';
+}
+
+String generatePartnersReport(
+  ResolvedRoster roster,
+  Map<String, dynamic> summary, {
+  String? prLink,
+}) {
+  final now = DateTime.now().toUtc();
+  final quarter = 'Q${((now.month - 1) ~/ 3) + 1} ${now.year}';
+  final dateFmt = DateFormat('MMMM d, yyyy');
+  final prLineBlock = (prLink != null && prLink.trim().isNotEmpty)
+      ? '\n> **Proposed roster & report PR:** ${_formatPrReference(prLink)}  '
+      : '';
+
+  final partnerRows = <String>[
+    for (final p in roster.partners)
+      () {
+        final stats = summary[p.username] as Map<String, dynamic>?;
+        final total = stats?['total'] as int? ?? 0;
+        return '| @${p.username} | `${p.team}` | Maintainer | $total contributions | [ ] Verified Active |';
+      }(),
+  ];
+  final partnerBlock = _formatTableRowsBlock(partnerRows);
+
+  return '''
+# Quarterly Partner Team Verification Audit ($quarter)
+
+> **Audit date:** ${dateFmt.format(now)}  
+> **Audit quarter:** $quarter  
+> **Target team:** `@flutter/partners`  $prLineBlock
+> **Governance reference:** [docs/QUARTERLY_REVIEW.md](docs/QUARTERLY_REVIEW.md) • [docs/GOVERNANCE.md](docs/GOVERNANCE.md)
+
+This issue tracks quarterly verification for `@flutter/partners`.
+The audit facilitator reaches out to each partner organization to confirm active participation for the members below.
+
+## Active partner team members
+
+| Contributor | Partner team | Role | 12m activity snapshot | Status verification |
+| :--- | :--- | :--- | :--- | :--- |$partnerBlock
+
+## Departures and offboarding
+
+If any listed engineer has concluded their engagement with the partners team:
+
+1. Confirm offboarding to revoke `@flutter/partners` write access.
+2. If the departing engineer remains an active open-source contributor, specify their community ladder placement (`Committer` or `Reviewer`).
+
+- [ ] All partner memberships confirmed with partner organizations.
+''';
+}
+
+/// Parses an existing `reports/YYYY-QX-community-ladder-audit.md` file to
+/// recover the pre-audit status of contributors in case `--finalize` is run on
+/// a PR branch where `--prepare` already updated `data/contributors.yaml`.
+({
+  Map<String, String> gracePeriodRolesLower,
+  Map<String, String> promotedInitialStatusLower,
+}) _parseExistingReportState(File? reportFile) {
+  final gracePeriodRolesLower = <String, String>{};
+  final promotedInitialStatusLower = <String, String>{};
+  if (reportFile == null || !reportFile.existsSync()) {
+    return (
+      gracePeriodRolesLower: gracePeriodRolesLower,
+      promotedInitialStatusLower: promotedInitialStatusLower,
+    );
+  }
+
+  var section = '';
+  for (final line in reportFile.readAsLinesSync()) {
+    if (line.startsWith('## ')) {
+      section = line.trim();
+      continue;
+    }
+    if (!line.startsWith('| @')) continue;
+    final cells = line.split('|').map((c) => c.trim()).toList();
+    if (cells.length < 4) continue;
+    final username = cells[1].replaceAll('@', '').toLowerCase();
+    if (section.contains('Recommended promotions')) {
+      promotedInitialStatusLower[username] = cells[2];
+    } else if (section.contains('30-day grace period')) {
+      gracePeriodRolesLower[username] = cells[2];
+    }
+  }
+
+  return (
+    gracePeriodRolesLower: gracePeriodRolesLower,
+    promotedInitialStatusLower: promotedInitialStatusLower,
+  );
+}
+
+void _finalizeAudit(
+  ResolvedRoster roster,
+  Map<String, dynamic> summary, {
+  required File contributorsFile,
+  required Set<String> retainedUsers,
+  required Set<String> excludedUsers,
+  required Map<String, String> discordOverrides,
+  required bool isDryRun,
+  File? existingCommunityReportFile,
+}) {
+  print('Applying quarterly review updates to ${contributorsFile.path}...');
+  if (isDryRun) {
+    print('Running in DRY-RUN mode. No files will be modified.');
+  }
+
+  final reportState = _parseExistingReportState(existingCommunityReportFile);
+
+  final discordByUserLower = <String, String>{
+    ...roster.discordByUserLower,
+    ...discordOverrides,
+  };
+  final graceUntilByUserLower = <String, String>{
+    ...roster.graceUntilByUserLower,
+  };
+
+  String? getDiscord(String username) =>
+      discordByUserLower[username.toLowerCase()];
+
+  final updatedCommitters = <String>[];
+  final updatedReviewers = <String>[];
+  final updatedEmeriti = <String>[];
+
+  final promotedToCommitter = <String>[];
+  final reinstatedUsers = <String>[];
+  final onboardedNewJoiners = <String>[];
+  final transitionedToEmeritus = <String>[];
+
+  // 1. Evaluate current Committers
+  for (final username in roster.committers) {
+    final lower = username.toLowerCase();
+
+    // If `--finalize` is re-run on a PR branch where `--prepare` already moved
+    // a candidate to Committers, check if they were subsequently excluded.
+    if (excludedUsers.contains(lower)) {
+      final priorStatus = reportState.promotedInitialStatusLower[lower];
+      if (priorStatus == 'Reviewer') {
+        updatedReviewers.add(username);
+        continue;
+      } else if (priorStatus == 'Dasher Emeritus' ||
+          priorStatus == 'Org Member') {
+        updatedEmeriti.add(username);
+        continue;
+      } else if (priorStatus == 'External Contributor') {
+        continue;
+      }
+    }
+
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+
+    if (total >= 10 || retainedUsers.contains(lower)) {
+      updatedCommitters.add(username);
+    } else {
+      updatedEmeriti.add(username);
+      transitionedToEmeritus.add('$username (from Committer)');
+    }
+  }
+
+  // 2. Evaluate current Reviewers
+  final now = DateTime.now().toUtc();
+  for (final r in roster.reviewers) {
+    final username = r.username;
+    final lower = username.toLowerCase();
+
+    if (excludedUsers.contains(lower)) {
+      final priorStatus = reportState.promotedInitialStatusLower[lower];
+      if (priorStatus == 'Dasher Emeritus' || priorStatus == 'Org Member') {
+        updatedEmeriti.add(username);
+        continue;
+      } else if (priorStatus == 'External Contributor') {
+        continue;
+      }
+    }
+
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+
+    if (total >= 30 && prs >= 10 && !excludedUsers.contains(lower)) {
+      updatedCommitters.add(username);
+      promotedToCommitter.add(username);
+    } else if (total >= 10 ||
+        retainedUsers.contains(lower) ||
+        _isGraceDateActive(r.graceUntil, now)) {
+      updatedReviewers.add(username);
+    } else {
+      updatedEmeriti.add(username);
+      transitionedToEmeritus.add('$username (from Reviewer)');
+    }
+  }
+
+  // 3. Evaluate unassigned live Org Members
+  for (final username in roster.unassignedOrgMembers) {
+    final lower = username.toLowerCase();
+
+    if (retainedUsers.contains(lower)) {
+      final priorRole = reportState.gracePeriodRolesLower[lower];
+      if (priorRole == 'Committer') {
+        updatedCommitters.add(username);
+      } else {
+        updatedReviewers.add(username);
+      }
+      continue;
+    }
+
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+
+    if (total >= 30 && prs >= 10 && !excludedUsers.contains(lower)) {
+      updatedCommitters.add(username);
+      promotedToCommitter.add(username);
+    } else if (total >= 10 && !excludedUsers.contains(lower)) {
+      updatedReviewers.add(username);
+      reinstatedUsers.add('$username (to Reviewer)');
+    } else {
+      updatedEmeriti.add(username);
+      transitionedToEmeritus.add('$username (from Org Member)');
+    }
+  }
+
+  // 4. Evaluate external Dasher Emeriti for reinstatement
+  for (final username in roster.externalEmeriti) {
+    final lower = username.toLowerCase();
+
+    if (retainedUsers.contains(lower)) {
+      final priorRole = reportState.gracePeriodRolesLower[lower];
+      if (priorRole == 'Committer') {
+        updatedCommitters.add(username);
+      } else {
+        updatedReviewers.add(username);
+      }
+      continue;
+    }
+
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+
+    if (total >= 30 && prs >= 10 && !excludedUsers.contains(lower)) {
+      updatedCommitters.add(username);
+      reinstatedUsers.add('$username (to Committer)');
+    } else if (total >= 10 && !excludedUsers.contains(lower)) {
+      updatedReviewers.add(username);
+      reinstatedUsers.add('$username (to Reviewer)');
+    } else {
+      updatedEmeriti.add(username);
+    }
+  }
+
+  // 5. Onboard accepted external new joiners
+  final rawExternal = _discoverExternalCandidates(roster, summary);
+  for (final username in rawExternal) {
+    final lower = username.toLowerCase();
+    if (excludedUsers.contains(lower)) continue;
+    final stats = summary[username] as Map<String, dynamic>?;
+    final total = stats?['total'] as int? ?? 0;
+    final prs = stats?['merged_prs'] as int? ?? 0;
+    if (total >= 30 && prs >= 10) {
+      updatedCommitters.add(username);
+      onboardedNewJoiners.add('$username (to Committer)');
+    } else if (total >= 10) {
+      updatedReviewers.add(username);
+      onboardedNewJoiners.add('$username (to Reviewer)');
+    }
+  }
+
+  updatedCommitters.sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+  updatedReviewers.sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+  updatedEmeriti.sort((a, b) => a.toLowerCase().compareTo(b.toLowerCase()));
+
+  print('Audit Update Summary:');
+  print(
+      '  • Promoted to Committer (${promotedToCommitter.length}): ${promotedToCommitter.isEmpty ? "none" : promotedToCommitter.join(", ")}');
+  print(
+      '  • Reinstated / enrolled from Org or Emeritus (${reinstatedUsers.length}): ${reinstatedUsers.isEmpty ? "none" : reinstatedUsers.join(", ")}');
+  print(
+      '  • Onboarded new joiners (${onboardedNewJoiners.length}): ${onboardedNewJoiners.isEmpty ? "none" : onboardedNewJoiners.join(", ")}');
+  print(
+      '  • Transitioned to Dasher Emeritus (${transitionedToEmeritus.length}): ${transitionedToEmeritus.isEmpty ? "none" : transitionedToEmeritus.length}');
+
+  if (isDryRun) {
+    print('Dry run complete. Exiting without modifying files.');
+    return;
+  }
+
+  if (existingCommunityReportFile != null &&
+      existingCommunityReportFile.existsSync()) {
+    final updatedReport = _updateReportOnFinalize(
+      existingCommunityReportFile.readAsStringSync(),
+      summary,
+      retainedUsers: retainedUsers,
+      excludedUsers: excludedUsers,
+    );
+    existingCommunityReportFile.writeAsStringSync(updatedReport);
+    print('Updated ${existingCommunityReportFile.path}.');
+  }
+
+  final today = DateTime.now().toUtc().toIso8601String().split('T').first;
+  final updatedRoster = ContributorsRoster(
+    maintainers: MaintainersRoster(
+      googlers: [
+        for (final g in roster.googlers)
+          ContributorEntry(
+            username: g,
+            discord: getDiscord(g),
+            role: 'maintainer',
+          ),
+      ],
+      partners: [
+        for (final p in roster.partners)
+          ContributorEntry(
+            username: p.username,
+            team: p.team,
+            discord: getDiscord(p.username),
+            role: 'maintainer',
+          ),
+      ],
+    ),
+    committers: [
+      for (final c in updatedCommitters)
+        ContributorEntry(
+          username: c,
+          discord: getDiscord(c),
+          role: 'committer',
+        ),
+    ],
+    reviewers: [
+      for (final r in updatedReviewers)
+        ContributorEntry(
+          username: r,
+          discord: getDiscord(r),
+          graceUntil: graceUntilByUserLower[r.toLowerCase()],
+          role: 'reviewer',
+        ),
+    ],
+    dashEmeritus: [
+      for (final e in updatedEmeriti)
+        ContributorEntry(
+          username: e,
+          discord: getDiscord(e),
+          role: 'emeritus',
+        ),
+    ],
+  );
+
+  contributorsFile
+      .writeAsStringSync(updatedRoster.toYamlString(lastUpdated: today));
+  print('Applied verified role updates to ${contributorsFile.path}.');
+
+  if (contributorsFile.path == 'data/contributors.yaml') {
+    final result =
+        Process.runSync('dart', ['run', 'tool/generate_roster.dart']);
+    if (result.exitCode == 0) {
+      stdout.write(result.stdout);
+    } else {
+      print(
+          'Run `dart run tool/generate_roster.dart` to rebuild ROSTER.md and EMERITUS.md (${result.stderr}).');
+    }
+  } else {
+    print(
+        'Run `dart run tool/generate_roster.dart` to rebuild ROSTER.md and EMERITUS.md.');
+  }
+}
+
+String _updateReportOnFinalize(
+  String reportContent,
+  Map<String, dynamic> summary, {
+  required Set<String> retainedUsers,
+  required Set<String> excludedUsers,
+}) {
+  final lines = reportContent.split('\n');
+  final newRetentionRows = <String>[];
+  final filteredLines = <String>[];
+  var section = '';
+
+  for (final line in lines) {
+    if (line.startsWith('## ')) {
+      section = line.trim();
+      filteredLines.add(line);
+      continue;
+    }
+    if (line.startsWith('| @')) {
+      final cells = line.split('|').map((c) => c.trim()).toList();
+      if (cells.length >= 5) {
+        final rawUser = cells[1].replaceAll('@', '');
+        final lower = rawUser.toLowerCase();
+        if (section.contains('Recommended promotions')) {
+          if (excludedUsers.contains(lower)) {
+            if (cells[2] == 'Reviewer') {
+              newRetentionRows
+                  .add('| @$rawUser | Reviewer | ${cells[4]} | ${cells[5]} |');
+            }
+            continue;
+          }
+        } else if (section.contains('30-day grace period')) {
+          if (retainedUsers.contains(lower)) {
+            final role = cells[2] == 'Committer' ? 'Committer' : 'Reviewer';
+            final stats = summary[rawUser] as Map<String, dynamic>?;
+            final prs = stats?['merged_prs'] as int? ?? 0;
+            final total = cells[3];
+            newRetentionRows.add('| @$rawUser | $role | $prs | $total |');
+            continue;
+          } else {
+            filteredLines.add(line.replaceFirst(
+                '| In grace period |', '| Moved to Emeritus |'));
+            continue;
+          }
+        }
+      }
+    }
+    filteredLines.add(line);
+  }
+
+  if (newRetentionRows.isEmpty) {
+    return filteredLines.join('\n');
+  }
+
+  final resultLines = <String>[];
+  var inRetentionTable = false;
+  var insertedRetentionRows = false;
+  for (var i = 0; i < filteredLines.length; i++) {
+    final line = filteredLines[i];
+    if (line.startsWith('## Active role retention')) {
+      inRetentionTable = true;
+    } else if (inRetentionTable && line.startsWith('## ')) {
+      if (!insertedRetentionRows) {
+        resultLines.addAll(newRetentionRows);
+        insertedRetentionRows = true;
+      }
+      inRetentionTable = false;
+    } else if (inRetentionTable &&
+        line.trim().isEmpty &&
+        i > 0 &&
+        filteredLines[i - 1].startsWith('|')) {
+      resultLines.addAll(newRetentionRows);
+      insertedRetentionRows = true;
+      inRetentionTable = false;
+    }
+    resultLines.add(line);
+  }
+  if (inRetentionTable && !insertedRetentionRows) {
+    resultLines.addAll(newRetentionRows);
+  }
+  return resultLines.join('\n');
+}
+
+void _outputReport(String report, String? outputPath) {
+  if (outputPath != null) {
+    File(outputPath).writeAsStringSync(report);
+    print('Generated report saved to $outputPath');
+  } else {
+    print(report);
+  }
+}
diff --git a/tool/seed_initial_data.dart b/tool/seed_initial_data.dart
new file mode 100644
index 0000000..2222f70
--- /dev/null
+++ b/tool/seed_initial_data.dart
@@ -0,0 +1,480 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert';
+import 'dart:io';
+import 'package:args/args.dart';
+import 'bots.dart';
+import 'github.dart';
+import 'validate_roster.dart';
+
+void main(List<String> args) async {
+  final parser = ArgParser()
+    ..addFlag('live',
+        help:
+            'Fetch live org membership from GitHub API instead of using historical baseline',
+        defaultsTo: false)
+    ..addOption('token', help: 'GitHub personal access token');
+
+  final results = parser.parse(args);
+  final isLive = results['live'] as bool;
+  final token = results['token'] as String?;
+
+  print('=== Flutter Contributor Ladder Bootstrap & Seeding Tool ===');
+
+  final dataDir = Directory('data');
+  if (!dataDir.existsSync()) {
+    dataDir.createSync(recursive: true);
+  }
+  final activityDir = Directory('data/activity');
+  if (!activityDir.existsSync()) {
+    activityDir.createSync(recursive: true);
+  }
+
+  if (isLive) {
+    await _runLiveBootstrap(token);
+  } else {
+    _runHistoricalBootstrap();
+  }
+
+  print(
+      '\nBootstrap complete! Run `dart run tool/generate_roster.dart` to generate ROSTER.md and EMERITUS.md.');
+}
+
+/// Runs bootstrap against live GitHub organization data.
+Future<void> _runLiveBootstrap(String? token) async {
+  final client = GitHubClient(token: token);
+  print('Querying Flutter GitHub organization members...');
+
+  try {
+    await loadRobotTeams(client);
+    // 1. Fetch all members of flutter org
+    final allOrgMembers = await client.getOrgMembers('flutter');
+    print(
+        'Found ${allOrgMembers.length} total members in flutter organization.');
+
+    // 2. Fetch Googlers and Partners teams (merged with known exception Maintainers)
+    print('Querying @flutter/googlers and @flutter/partners teams...');
+    final googlers = {
+      ...await client.getTeamMembers('flutter', 'googlers'),
+      ...loadKnownExceptionMaintainers(),
+    };
+    final partners = await client.getTeamMembers('flutter', 'partners');
+    print('Found ${googlers.length} Googlers and ${partners.length} Partners.');
+
+    // Query child teams of @flutter/partners to resolve exact child team / POC handles
+    print('Resolving child teams of @flutter/partners...');
+    final partnerTeamMap = <String, String>{};
+    try {
+      final childTeamSlugs = await client.getChildTeams('flutter', 'partners');
+      for (final childSlug in childTeamSlugs) {
+        final childMembers = await client.getTeamMembers('flutter', childSlug);
+        for (final m in childMembers) {
+          partnerTeamMap[m] = '@flutter/$childSlug';
+        }
+      }
+      print(
+          'Resolved child teams for ${partnerTeamMap.length} partner members.');
+    } catch (e) {
+      print('Notice: Could not resolve child teams: $e');
+    }
+
+    // 3. Separate Maintainers from Community Candidates
+    final maintainers = <String>{...googlers, ...partners};
+    final communityCandidates = allOrgMembers.difference(maintainers).toList()
+      ..sort();
+
+    print('Maintainers (Googlers + Partners): ${maintainers.length}');
+    print(
+        'Non-Googler/Non-Partner org members to evaluate: ${communityCandidates.length}');
+    print(
+        'API Optimization: Skipping activity queries for all ${maintainers.length} Maintainers!');
+
+    final now = DateTime.now().toUtc();
+    final oneYearAgo = now.subtract(const Duration(days: 365));
+
+    print(
+        '\nEvaluating 12-month rolling activity (${oneYearAgo.toIso8601String().split('T').first} to ${now.toIso8601String().split('T').first}) using batched GraphQL queries...');
+
+    final activitySummary = await client.getBatchUserActivity(
+        communityCandidates,
+        since: oneYearAgo,
+        until: now);
+
+    final committers = <String>[];
+    final reviewers = <String>[];
+    final emeriti = <String>[];
+
+    for (final member in communityCandidates) {
+      if (isExcludedAccount(member)) continue;
+      final activity = activitySummary[member] ??
+          {'total': 0, 'merged_prs': 0, 'issues': 0, 'reviews': 0};
+      final total = activity['total'] ?? 0;
+      final prs = activity['merged_prs'] ?? 0;
+
+      if (total >= 30 && prs >= 10) {
+        committers.add(member);
+      } else if (total >= 10) {
+        reviewers.add(member);
+      } else {
+        emeriti.add(member);
+      }
+    }
+
+    print('Results for current org members:');
+    print('  • Maintainers: ${maintainers.length}');
+    print('  • Committers:  ${committers.length}');
+    print('  • Reviewers:   ${reviewers.length}');
+    print('  • Dasher Emeritus (Inactive): ${emeriti.length}');
+
+    // 4. External candidate discovery (non-org contributors with high activity)
+    print('\nDiscovering active external community candidates...');
+    final prospective = <String>[];
+    try {
+      final externalList = [
+        'Mairramer',
+        'koji-1009',
+      ];
+      final externalStats = await client.getBatchUserActivity(externalList,
+          since: oneYearAgo, until: now);
+      for (final entry in externalStats.entries) {
+        activitySummary[entry.key] = entry.value;
+        if ((entry.value['total'] ?? 0) >= 10) {
+          prospective.add(entry.key);
+        }
+      }
+      print(
+          'Discovered ${prospective.length} active external candidates for invitation: $prospective');
+    } catch (e) {
+      print('Notice: External discovery completed with defaults: $e');
+    }
+
+    // 5. Save data/activity_summary.json
+    final summaryFile = File('data/activity_summary.json');
+    summaryFile.writeAsStringSync(
+        const JsonEncoder.withIndent('  ').convert(activitySummary));
+    print('Saved ${summaryFile.path}');
+
+    // 6. Write data/contributors.yaml
+    writeContributorsYaml(
+      googlers: googlers.toList()..sort(),
+      partners: partners.toList()..sort(),
+      partnerTeams: partnerTeamMap,
+      committers: committers..sort(),
+      reviewers: reviewers..sort(),
+      emeriti: emeriti..sort(),
+    );
+  } finally {
+    client.close();
+  }
+}
+
+/// Runs bootstrap using the vetted historical analysis from the proposal.
+void _runHistoricalBootstrap() {
+  print(
+      'Seeding Day 1 roster and baseline metrics from approved proposal data...');
+
+  // Canonical engineers / Partners
+  final partners = [
+    'kenvandine',
+    'robert-ancell',
+  ];
+
+  // Active Committers from proposal analysis (>= 30 total, >= 10 PRs)
+  final committers = [
+    'AbdeMohlbi',
+    'AlexV525',
+    'DanTup',
+    'Jhon-Aires',
+    'RobertOdrowaz',
+    'ValentinVignal',
+    'bleroux',
+    'csells',
+    'davidhicks980',
+    'huycozy',
+    'knopp',
+    'ksokolovskyi',
+    'mattkae',
+    'navaronbracke',
+    'parlough',
+    'rkishan516',
+    'schultek',
+    'vickyduran',
+  ];
+
+  // Active Reviewers from proposal analysis (>= 10 total)
+  final reviewers = [
+    'bdero',
+    'danagbemava-nc',
+    'filiph',
+    'gnprice',
+    'nt4f04uNd',
+    'pedromassango',
+    'piedcipher',
+    'tirth-patel-nc',
+    'yiiim',
+  ];
+
+  // Dasher Emeriti (< 10 total in 12m historical analysis, bots filtered out)
+  final emeriti = [
+    '0xZOne',
+    'AnnaPS',
+    'AyushBherwani1998',
+    'CareF',
+    'ColdPaleLight',
+    'DiegoGW',
+    'Ehesp',
+    'FXschwartz',
+    'FirentisTFW',
+    'Hari-07',
+    'HidenoriMatsubayashi',
+    'Hixie',
+    'Jan-Stepien',
+    'JsouLiang',
+    'Kirpal',
+    'KristinBi',
+    'LinXunFeng',
+    'MacarenaSantos',
+    'Rexios80',
+    'Salakar',
+    'SofiaRey',
+    'Swiftaxe',
+    'Vanethos',
+    'YeungKC',
+    'a14n',
+    'alestiago',
+    'allisonryan0002',
+    'atrope',
+    'azchohfi',
+    'bartekpacia',
+    'bernaferrari',
+    'brianegan',
+    'bruno-garcia',
+    'bselwe',
+    'btobin',
+    'chenglu',
+    'chinmoy12c',
+    'chriscraws',
+    'collinjackson',
+    'dam-ease',
+    'darshankawar',
+    'eggfly',
+    'ened',
+    'erickzanardo',
+    'eseidel',
+    'exaby73',
+    'felangel',
+    'fluttercerberus',
+    'gastonliz',
+    'guoguo338',
+    'hamdikahloun',
+    'harri35',
+    'hbatagelo',
+    'helinanever',
+    'hgraceb',
+    'horiaciu',
+    'jingshao-code',
+    'jnschulze',
+    'jokerttu',
+    'jpnurmi',
+    'jwinarske',
+    'kaiceyd',
+    'kevinburns426',
+    'kmillikin',
+    'linxuebin1990',
+    'luckysmg',
+    'magicianA',
+    'martinduva',
+    'marwfair',
+    'matiasleyba',
+    'matthew-carroll',
+    'mbcorona',
+    'mchudy',
+    'milezabaleta',
+    'miquelbeltran',
+    'moffatman',
+    'mvanbeusekom',
+    'omartinma',
+    'pingbird',
+    'puneetkukreja98',
+    'renefloor',
+    'rzambroni',
+    'saurabh-mirajkar',
+    'scarletteliza',
+    'scutlight',
+    'simpson-peter',
+    'slightfoot',
+    'tgucio',
+    'tpiaggio',
+    'vaind',
+    'valentinallavayol',
+    'wangying3426',
+    'werainkhatri',
+    'whesse',
+    'wolfenrain',
+    'xu-baolin',
+    'zhongwuzw',
+  ]..removeWhere(isBot);
+
+  // Googlers placeholder list for baseline (managed via @flutter/googlers on GitHub)
+  final googlers = [
+    'Piinks',
+  ];
+
+  // Seed baseline metrics dictionary
+  final activitySummary = <String, Map<String, int>>{
+    'AbdeMohlbi': {
+      'merged_prs': 158,
+      'issues': 10,
+      'reviews': 12,
+      'total': 180
+    },
+    'parlough': {
+      'merged_prs': 223,
+      'issues': 155,
+      'reviews': 300,
+      'total': 678
+    },
+    'bleroux': {'merged_prs': 78, 'issues': 20, 'reviews': 27, 'total': 125},
+    'ksokolovskyi': {
+      'merged_prs': 54,
+      'issues': 10,
+      'reviews': 21,
+      'total': 85
+    },
+    'robert-ancell': {
+      'merged_prs': 57,
+      'issues': 12,
+      'reviews': 15,
+      'total': 84
+    },
+    'ValentinVignal': {
+      'merged_prs': 53,
+      'issues': 10,
+      'reviews': 20,
+      'total': 83
+    },
+    'navaronbracke': {
+      'merged_prs': 24,
+      'issues': 20,
+      'reviews': 35,
+      'total': 79
+    },
+    'rkishan516': {'merged_prs': 69, 'issues': 2, 'reviews': 2, 'total': 73},
+    'DanTup': {'merged_prs': 16, 'issues': 20, 'reviews': 36, 'total': 72},
+    'huycozy': {'merged_prs': 34, 'issues': 15, 'reviews': 20, 'total': 69},
+    'csells': {'merged_prs': 29, 'issues': 16, 'reviews': 20, 'total': 65},
+    'schultek': {'merged_prs': 46, 'issues': 8, 'reviews': 10, 'total': 64},
+    'Jhon-Aires': {'merged_prs': 47, 'issues': 5, 'reviews': 4, 'total': 56},
+    'RobertOdrowaz': {'merged_prs': 35, 'issues': 5, 'reviews': 5, 'total': 45},
+    'AlexV525': {'merged_prs': 18, 'issues': 10, 'reviews': 10, 'total': 38},
+    'knopp': {'merged_prs': 22, 'issues': 6, 'reviews': 10, 'total': 38},
+    'davidhicks980': {
+      'merged_prs': 11,
+      'issues': 10,
+      'reviews': 12,
+      'total': 33
+    },
+    'vickyduran': {'merged_prs': 24, 'issues': 4, 'reviews': 5, 'total': 33},
+    'mattkae': {'merged_prs': 29, 'issues': 30, 'reviews': 36, 'total': 95},
+    'tirth-patel-nc': {
+      'merged_prs': 5,
+      'issues': 15,
+      'reviews': 10,
+      'total': 30
+    },
+    'gnprice': {'merged_prs': 5, 'issues': 12, 'reviews': 10, 'total': 27},
+    'danagbemava-nc': {
+      'merged_prs': 0,
+      'issues': 15,
+      'reviews': 8,
+      'total': 23
+    },
+    'Mairramer': {'merged_prs': 13, 'issues': 4, 'reviews': 4, 'total': 21},
+    'piedcipher': {'merged_prs': 9, 'issues': 5, 'reviews': 5, 'total': 19},
+    'yiiim': {'merged_prs': 14, 'issues': 1, 'reviews': 2, 'total': 17},
+    'filiph': {'merged_prs': 5, 'issues': 6, 'reviews': 5, 'total': 16},
+    'koji-1009': {'merged_prs': 13, 'issues': 1, 'reviews': 1, 'total': 15},
+    'nate-thegrate': {'merged_prs': 5, 'issues': 4, 'reviews': 4, 'total': 13},
+    'nt4f04uNd': {'merged_prs': 1, 'issues': 5, 'reviews': 5, 'total': 11},
+    'pedromassango': {'merged_prs': 6, 'issues': 3, 'reviews': 2, 'total': 11},
+    'bdero': {'merged_prs': 5, 'issues': 3, 'reviews': 2, 'total': 10},
+  };
+
+  final summaryFile = File('data/activity_summary.json');
+  summaryFile.writeAsStringSync(
+      const JsonEncoder.withIndent('  ').convert(activitySummary));
+  print('Wrote ${summaryFile.path}');
+
+  writeContributorsYaml(
+    googlers: googlers,
+    partners: partners,
+    committers: committers,
+    reviewers: reviewers,
+    emeriti: emeriti,
+  );
+}
+
+void writeContributorsYaml({
+  required List<String> googlers,
+  required List<String> partners,
+  Map<String, String>? partnerTeams,
+  required List<String> committers,
+  required List<String> reviewers,
+  required List<String> emeriti,
+  File? outputFile,
+}) {
+  final today = DateTime.now().toUtc().toIso8601String().split('T').first;
+  final googlerEntries = [
+    for (final g in googlers) '    - username: $g\n      role: maintainer',
+  ].join('\n');
+  final partnerEntries = [
+    for (final p in partners)
+      '    - username: $p\n'
+          '      team: "${partnerTeams?[p] ?? '@flutter/partners'}"\n'
+          '      role: maintainer',
+  ].join('\n');
+  final committerEntries = [
+    for (final c in committers) '  - username: $c\n    role: committer',
+  ].join('\n');
+  final reviewerEntries = [
+    for (final r in reviewers) '  - username: $r\n    role: reviewer',
+  ].join('\n');
+  final emeritusEntries = [
+    for (final e in emeriti) '  - username: $e\n    role: emeritus',
+  ].join('\n');
+
+  final content = '''
+# Flutter Contributor Ladder Roster
+# Source of truth for Flutter contributor roles and permissions.
+# Last updated: $today
+
+maintainers:
+  # Maintainers on the Flutter team (@flutter/googlers and @flutter/partners)
+  # Granted Write access + Org Moderation
+  googlers:
+$googlerEntries
+  partners:
+$partnerEntries
+
+committers:
+  # Members of @flutter/committers (Child of @flutter/flutter-hackers)
+  # Granted GitHub Write role / merge access
+$committerEntries
+
+reviewers:
+  # Members of @flutter/reviewers (Child of @flutter/flutter-hackers)
+  # Granted GitHub Triage role
+$reviewerEntries
+
+dash_emeritus:
+  # Honored alumni (External, non-org members on GitHub)
+$emeritusEntries
+''';
+
+  final file = outputFile ?? File('data/contributors.yaml');
+  file.writeAsStringSync(content);
+  print(
+      'Wrote ${file.path} (${committers.length} Committers, ${reviewers.length} Reviewers, ${emeriti.length} Emeriti).');
+}
diff --git a/tool/sync_activity.dart b/tool/sync_activity.dart
index 8fb9fb8..c9f0c83 100644
--- a/tool/sync_activity.dart
+++ b/tool/sync_activity.dart
@@ -1,4 +1,4 @@
-// Copyright 2014 The Flutter Authors. All rights reserved.
+// Copyright 2026 The Flutter Authors.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
diff --git a/tool/validate_roster.dart b/tool/validate_roster.dart
new file mode 100644
index 0000000..d9de0eb
--- /dev/null
+++ b/tool/validate_roster.dart
@@ -0,0 +1,195 @@
+// Copyright 2026 The Flutter Authors.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+import 'package:yaml/yaml.dart';
+import 'bots.dart';
+
+const validRoles = {'maintainer', 'committer', 'reviewer', 'emeritus'};
+
+const knownMaintainersPath =
+    '.agents/skills/quarterly-ladder-analysis/references/known_maintainers.txt';
+const knownBotsPath =
+    '.agents/skills/quarterly-ladder-analysis/references/bots.txt';
+
+/// Loads known bot/automation accounts from [knownBotsPath].
+Set<String> loadKnownBotReferences({String path = knownBotsPath}) {
+  final file = File(path);
+  if (!file.existsSync()) return {};
+  final result = <String>{};
+  for (final line in file.readAsLinesSync()) {
+    final trimmed = line.trim();
+    if (trimmed.isNotEmpty && !trimmed.startsWith('#')) {
+      result.add(trimmed.toLowerCase());
+    }
+  }
+  return result;
+}
+
+/// Loads known exception Maintainers from the single source of truth file
+/// ([knownMaintainersPath]).
+Set<String> loadKnownExceptionMaintainers(
+    {String path = knownMaintainersPath}) {
+  final file = File(path);
+  if (!file.existsSync()) return {};
+  final result = <String>{};
+  for (final line in file.readAsLinesSync()) {
+    final trimmed = line.trim();
+    if (trimmed.isNotEmpty && !trimmed.startsWith('#')) {
+      result.add(trimmed);
+    }
+  }
+  return result;
+}
+
+/// Returns true if [username] is listed in [knownMaintainersPath].
+bool isKnownExceptionMaintainer(String username,
+    {Set<String>? knownMaintainers}) {
+  final lower = username.toLowerCase().trim();
+  final set = knownMaintainers ?? loadKnownExceptionMaintainers();
+  return set.any((m) => m.toLowerCase() == lower);
+}
+
+/// Validates a parsed `contributors.yaml` document and returns a list of
+/// human-readable error strings (empty if valid).
+List<String> validateContributorsYaml(dynamic doc) {
+  if (doc is! YamlMap) {
+    return ['Error: data/contributors.yaml root must be a YAML mapping.'];
+  }
+
+  final seenUsers = <String, String>{};
+  final errors = <String>[];
+  final knownExceptionMaintainers = loadKnownExceptionMaintainers();
+  final knownExceptionLower =
+      knownExceptionMaintainers.map((u) => u.toLowerCase()).toSet();
+  final knownBotsLower = loadKnownBotReferences();
+
+  void validateUser(dynamic entry, String section,
+      {bool isMaintainer = false}) {
+    if (entry is! YamlMap) {
+      errors.add('Error in $section: entry is not a map: $entry');
+      return;
+    }
+
+    final username = entry['username'] as String?;
+    if (username == null || username.trim().isEmpty) {
+      errors.add('Error in $section: missing username: $entry');
+      return;
+    }
+
+    final lowerUser = username.toLowerCase();
+    if (isExcludedAccount(username) || knownBotsLower.contains(lowerUser)) {
+      errors.add(
+          'Error in $section: "@$username" is a bot or excluded automation account and must not be listed in contributors.yaml.');
+    }
+    if (seenUsers.containsKey(lowerUser)) {
+      errors.add(
+          'Error: duplicate username "@$username" in $section (already defined in ${seenUsers[lowerUser]})');
+    } else {
+      seenUsers[lowerUser] = section;
+    }
+
+    if (!isMaintainer && knownExceptionLower.contains(lowerUser)) {
+      errors.add(
+          'Error in $section: "@$username" is a known Maintainer and must be listed under maintainers.googlers.');
+    }
+
+    final role = entry['role'] as String? ?? entry['suggested_role'] as String?;
+    if (role != null && !validRoles.contains(role.toLowerCase())) {
+      errors.add(
+          'Error in $section: invalid role "$role" for user @$username. Valid roles: $validRoles');
+    }
+
+    if (entry.containsKey('discord')) {
+      final discord = entry['discord'];
+      if (discord is! String || discord.trim().isEmpty) {
+        errors.add(
+            'Error in $section: invalid or empty discord username for user @$username.');
+      }
+    }
+
+    if (entry.containsKey('grace_until')) {
+      final graceUntil = entry['grace_until'];
+      if (graceUntil is! String ||
+          DateTime.tryParse(graceUntil.trim()) == null) {
+        errors.add(
+            'Error in $section: invalid grace_until date "$graceUntil" for user @$username (expected YYYY-MM-DD).');
+      }
+    }
+  }
+
+  // Validate Maintainers (must strictly be googlers or partners)
+  final maintainers = doc['maintainers'];
+  if (maintainers is YamlMap) {
+    for (final key in maintainers.keys) {
+      if (key != 'googlers' && key != 'partners') {
+        errors.add(
+            'Error in maintainers: invalid group "$key". All Maintainers must be in "googlers" or "partners".');
+      }
+    }
+    final googlers = maintainers['googlers'];
+    if (googlers is YamlList) {
+      for (final g in googlers) {
+        validateUser(g, 'maintainers.googlers', isMaintainer: true);
+      }
+    }
+    final partners = maintainers['partners'];
+    if (partners is YamlList) {
+      for (final p in partners) {
+        validateUser(p, 'maintainers.partners', isMaintainer: true);
+      }
+    }
+  }
+
+  // Validate Committers
+  final committers = doc['committers'];
+  if (committers is YamlList) {
+    for (final c in committers) {
+      validateUser(c, 'committers');
+    }
+  }
+
+  // Validate Reviewers
+  final reviewers = doc['reviewers'];
+  if (reviewers is YamlList) {
+    for (final r in reviewers) {
+      validateUser(r, 'reviewers');
+    }
+  }
+
+  // Validate Dasher Emeritus
+  final emeriti = doc['dash_emeritus'];
+  if (emeriti is YamlList) {
+    for (final e in emeriti) {
+      validateUser(e, 'dash_emeritus');
+    }
+  }
+
+  return errors;
+}
+
+void main(List<String> args) {
+  final filePath = args.isNotEmpty ? args.first : 'data/contributors.yaml';
+  final file = File(filePath);
+  if (!file.existsSync()) {
+    print('Error: $filePath does not exist.');
+    exit(1);
+  }
+
+  print('Validating $filePath...');
+  final content = file.readAsStringSync();
+  final dynamic doc = loadYaml(content);
+
+  final errors = validateContributorsYaml(doc);
+  for (final err in errors) {
+    print(err);
+  }
+
+  if (errors.isNotEmpty) {
+    print('\nValidation FAILED with ${errors.length} errors.');
+    exit(1);
+  }
+
+  print('Validation SUCCESS: $filePath is valid.');
+}