Add fast, integration, browser, and platform test lanes

.c8rc.json

@@ -0,0 +1,21 @@
+{
+  "all": true,
+  "include": [
+    "scripts/cli-args.mjs",
+    "scripts/build-diff-data.mjs",
+    "scripts/generate-summaries.mjs",
+    "scripts/present.mjs"
+  ],
+  "reporter": [
+    "text",
+    "json-summary",
+    "lcov"
+  ],
+  "reports-dir": "coverage",
+  "check-coverage": true,
+  "per-file": true,
+  "statements": 80,
+  "branches": 60,
+  "functions": 90,
+  "lines": 80
+}

.github/workflows/test-lanes.yml

@@ -0,0 +1,110 @@
+name: Test lanes
+
+on:
+  pull_request:
+  workflow_dispatch:
+  schedule:
+    - cron: "23 8 * * 1"
+
+permissions:
+  contents: read
+
+concurrency:
+  group: test-lanes-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  unit:
+    if: github.event_name != 'schedule'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+      - name: Set up Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 22.13.0
+          cache: npm
+      - name: Install dependencies
+        run: npm ci
+      - name: Run fast unit tests
+        run: npm run test:unit
+
+  integration:
+    if: github.event_name != 'schedule'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+      - name: Set up Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 22.13.0
+          cache: npm
+      - name: Install dependencies
+        run: npm ci
+      - name: Run Git and server tests
+        run: npm run test:integration
+
+  coverage:
+    if: github.event_name != 'schedule'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+      - name: Set up Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 22.13.0
+          cache: npm
+      - name: Install dependencies
+        run: npm ci
+      - name: Check core coverage
+        run: npm run test:coverage
+      - name: Upload coverage report
+        if: always()
+        uses: actions/upload-artifact@v6
+        with:
+          name: core-coverage
+          path: coverage
+          if-no-files-found: error
+
+  browser:
+    if: github.event_name != 'schedule'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+      - name: Set up Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 22.13.0
+          cache: npm
+      - name: Install dependencies
+        run: npm ci
+      - name: Install browser system packages
+        run: npx playwright install --with-deps chromium
+      - name: Run the browser journey
+        run: npm run test:browser
+
+  platform:
+    if: github.event_name != 'pull_request'
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-15
+          - windows-2025
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v6
+      - name: Set up Node
+        uses: actions/setup-node@v6
+        with:
+          node-version: 22.13.0
+          cache: npm
+      - name: Install dependencies
+        run: npm ci
+      - name: Check host shell assumptions
+        run: npm run test:platform

docs/content/development.mdx

@@ -71,9 +71,35 @@ pins. It is safe to run again and needs no ignored or generated files. Node
 22.13.0 and npm 10.9.2 are pinned in `.nvmrc` and `package.json`; the
 `corepack npm` commands use the pinned npm version.
 
-For a shorter local loop, `corepack npm run lint` checks types and lint rules.
-`corepack npm test` builds the app, runs the Node test suite, then runs the
-desktop and mobile browser checks.
+For a shorter local loop, run one named lane:
+
+```sh
+corepack npm run lint
+corepack npm run test:unit
+corepack npm run test:integration
+corepack npm run test:coverage
+corepack npm run test:browser
+corepack npm run test:platform
+```
+
+| Command | What it checks |
+| --- | --- |
+| `npm run test:unit` | Fast parser, provider, doctor, release, config, and path checks. It does not build the app. |
+| `npm run test:integration` | The production build plus local Git, timing, agent note, presenter, and server checks. |
+| `npm run test:coverage` | Per-file coverage for the CLI parser, target builder, agent note writer, and presenter. |
+| `npm run test:browser` | The review journey in Chromium. It does not download a browser. |
+| `npm run test:platform` | Host command lookup and npm launcher rules with local fake tools. |
+| `npm test` | All five lanes in order. |
+
+The coverage lane writes text, JSON summary, and LCOV reports under
+`coverage/`. Each covered file must keep at least 80% statement and line
+coverage, 60% branch coverage, and 90% function coverage. The check applies
+the floor to each file.
+
+Pull request jobs run the unit, integration, coverage, and browser lanes from
+a clean Ubuntu checkout. They use local Git repos, fake coding agents, and
+checked-in browser data. A weekly job runs the platform lane on macOS 15 and
+Windows 2025. You can also start the **Test lanes** workflow by hand.
 
 For the supported browser, screen, and device checks, see [Mobile
 support](/mobile).
@@ -241,7 +267,6 @@ same bounded canary from an authenticated checkout with:
 ```sh
 npm run benchmark:canary -- --runs 1 --reasoning minimal
 ```
-
 ## Publish a release
 
 Publish from the protected **npm-publish** GitHub environment. It runs the