chore(release): cut v2.4.2 "Cairn" — the rung-0 compare surface - #438
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Bumps the workspace to 2.4.2, promotes the `[Unreleased]` CHANGELOG content into
a dated section, moves all 15 release anchors across 10 documents, and adds the
maintainer-authored release-notes override that `release-auto.yml` prefers over
the CHANGELOG extract.
The release itself is scaffolding for the v2.4.1 -> v2.5.0 "Fabric" line. The
emulation core is untouched -- no behaviour change to
rustynes-{cpu,ppu,apu,mappers,core}, no new hot-path API, and rustynes-cosim
stays excluded from the workspace and absent from the default build.
## Why "Cairn"
A cairn is a marker set along a route so you can tell you are still on it. That
is what a rolling per-cycle hash checkpoint is, and the release's subject is
building that compare surface: 89,343 CPU cycles of AccuracyCoin is 5,372,427
bytes of irq.csv against 352 bytes of ckpt.bin, a factor of 15,263, so the first
mismatch names a 4096-cycle window and only that window is re-run with full
capture.
## What this commit contains
* Cargo.toml `[workspace.package] version` 2.4.1 -> 2.4.2, and the Cargo.lock
propagation across the ten workspace members that inherit it.
* CHANGELOG.md: `## [Unreleased]` stays permanent and empty at the top; its
content moves under
`## [2.4.2] - 2026-08-22 - "Cairn" (checkpoints, and what a device can actually
observe)`. The header is verified to parse the way release-auto.yml parses it
-- the ` - YYYY-MM-DD - ` prefix, a quoted codename, then a parenthesised
theme -- since a malformed header degrades the published release title.
* The 15 anchors in README.md (badge + Current Release), docs/STATUS.md,
AGENTS.md (x3, including the never-claim-a-later-version guard),
VERSION-PLAN.md, to-dos/ROADMAP.md, SUPPORT.md, SECURITY.md, ROADMAP.md (x2),
OVERVIEW.md (x3) and ARCHITECTURE.md. Each demotes the v2.4.1 text to "built
on" rather than overwriting it, so the release chain stays readable.
* VERSION-PLAN.md gains a v2.4.2 row and `(current)` moves off v2.4.1;
`the_version_plan_table_marks_exactly_the_current_release` checks this.
* .github/release-notes/v2.4.2.md, 198 lines.
## Two gates earned their place, both failing first
`release_anchor_audit` FAILED CLOSED on a defect this commit introduced. The
VERSION-PLAN edit produced `**Current release: **v2.4.2` -- a doubled bold marker
-- so the pinned marker `**Current release: v` no longer matched, and the audit
refused to report a pass for an anchor it could not find rather than silently
checking 14 of 15. That is the exact failure mode it was written after.
`cosim_manifest_audit` then caught the price of exclusion that AGENTS.md
documents: an excluded package cannot use `version.workspace = true`, so
crates/rustynes-cosim/Cargo.toml still said 2.4.1 after the workspace moved. Its
message says so directly -- "the crate is excluded, so nothing inherits this for
you". Bumped, and its own tracked lockfile regenerated.
`libretro_info_audit` required the LOCAL rustynes_libretro.info display_version
to move with the workspace. Bumped to v2.4.2. NO upstream PR is opened: the
cadence rule limits upstream syncs to vX.Y.0 boundaries (next: v2.5.0) and no
licence changed here, which is the one override. Keeping the local file current
is what makes that eventual sync a copy rather than a re-derivation.
## On v2.4.0, which is deliberately not tagged
Checked rather than assumed. The workspace version was NEVER 2.4.0 on any commit
on any branch -- `git log --all -S'version = "2.4.0"' -- Cargo.toml` is empty,
and PR #428's merge commit b67c4f9 still reads 2.3.9. There is also no
`## [2.4.0]` CHANGELOG section, so release-auto would fail loudly by design
rather than ship empty notes.
So no commit exists that a v2.4.0 tag could honestly point at: every candidate's
own manifest announces a different version. v2.4.0 "Concordance" shipped inside
v2.4.1, which that release's notes and VERSION-PLAN.md both record. A skipped
version number is permitted by SemVer; a tag pointing at a tree that calls itself
something else is not honest, and retroactively contradicting a shipped
release's notes is the same class of record corruption as the v2.3.9 claim this
project retracted in #431. The release notes state this explicitly so the
question is answered where a reader will ask it.
## Verification
* AccuracyCoin 141/141 (100.00%, RAM decoder) and nestest 0-diff -- run, not
assumed, even though the core is untouched by this commit.
* release_anchor_audit: 8/8 (after the doubled-marker fix).
* cosim_manifest_audit: 4/4. libretro_info_audit: 3/3.
* cargo fmt --all --check: clean.
* markdownlint via pre-commit (pinned v0.39.0, --files not --all-files): Passed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
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Important
This repository does not receive automatic reviews because it has fewer than 10 stars. ⚙️ Run configurationConfiguration used: Path: .coderabbit.yaml Review profile: ASSERTIVE Plan: Pro Plus Run ID: 📝 WalkthroughWalkthroughRustyNES now identifies v2.4.2 “Cairn” as the current release. Package metadata and project documentation were updated. Release notes describe checkpoint hashing, observable data, divergence localization, wire artifacts, verification, and compatibility details. Changesv2.4.2 Release Update
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The release documentation still contains contradictory current-version markers and several inaccurate technical claims, including checkpoint sizing, cycle boundaries, validation ownership, and public-API scope. This could mislead users and maintainers about the v2.4.2 release; merge should wait until the documentation is corrected or explicitly accepted by the release owner. 🚥 Pre-merge checks | ✅ 9✅ Passed checks (9 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Antigravity review (Gemini via Ultra)This PR cuts the v2.4.2 "Cairn" release, bumping the workspace version and adding an automated test ( Blocking issues
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Automated first-pass review by Earlier review rounds (newest first)Round reviewed at 2026-08-22 18:00 UTCAntigravity review (Gemini via Ultra)This PR cuts the v2.4.2 "Cairn" release by bumping version numbers across package manifests and updating project documentation. Blocking issuesNone found. SuggestionsNone. This is a trivial version-bump and documentation PR. NitpicksNone. Automated first-pass review by Earlier review rounds (newest first)Round reviewed at 2026-08-22 17:45 UTCAntigravity review (Gemini via Ultra)Updates project documentation, manifests, and lockfiles to cut the v2.4.2 release. Blocking issuesNone found. SuggestionsThis is a trivial version bump and documentation update; no changes are suggested. NitpicksNone. Automated first-pass review by |
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Inline comments:
In @.github/release-notes/v2.4.2.md:
- Around line 28-31: Correct the checkpoint-size estimate in the AccuracyCoin
extrapolation to approximately 492 KB, consistent with the stated 15,263x ratio
and measured 352-byte checkpoint scaling; only retain 244 KB if the
documentation explicitly states the format or filtering assumption that yields
it.
- Around line 126-130: Update the release note sentence to attribute validation
of a stream length not divisible by 16 to observables_from_bytes, while
retaining Observable::decode as responsible for validating individual 16-byte
records; alternatively, remove the stream-length item from the decode validation
list.
- Around line 186-190: Update the Compatibility statement in the release notes
to scope “no public-API change” explicitly to shipped packages included in the
default build, while retaining the existing format and behavior claims and
acknowledging that rustynes-cosim is excluded from that scope.
- Around line 22-26: Update the release-note artifact count descriptions around
the AccuracyCoin table to document that the 8-cycle reset runs before IrqTrace
is armed: cpu_cycles includes cycles 0–7, while .obs.bin contains 89,335 records
for cycles 8–89,342. State this trace-start boundary near both relevant count
descriptions, including the checkpoint/hash sequence context.
In `@SECURITY.md`:
- Around line 5-8: Update the supported-version table in SECURITY.md to add a
2.4.x row marked as the current line, then relabel or reclassify the existing
2.3.x row to match the documented support policy and the v2.4.2 release
statement.
In `@to-dos/ROADMAP.md`:
- Line 58: Synchronize stale release markers so every document identifies v2.4.2
"Cairn" as current and does not present never-tagged v2.4.0 as next: update or
relabel to-dos/ROADMAP.md lines 58-58, 59, 62, 84, and 100; update stale
references in VERSION-PLAN.md lines 3, 58, and 93; and keep the v2.4.1/v2.4.2
history consistent in VERSION-PLAN.md lines 90-91.
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Cargo.lockis excluded by!**/*.lock,!Cargo.lockcrates/rustynes-cosim/Cargo.lockis excluded by!**/*.lock
📒 Files selected for processing (15)
.github/release-notes/v2.4.2.mdAGENTS.mdARCHITECTURE.mdCHANGELOG.mdCargo.tomlOVERVIEW.mdREADME.mdROADMAP.mdSECURITY.mdSUPPORT.mdVERSION-PLAN.mdcrates/rustynes-cosim/Cargo.tomlcrates/rustynes-libretro/rustynes_libretro.infodocs/STATUS.mdto-dos/ROADMAP.md
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…ot a nit Six CodeRabbit findings, every one verified against the code or the file before being acted on rather than accepted on plausibility. All six were real. ## The one that matters: 244 KB is wrong by about 2x The extrapolated checkpoint size has been 244 KB since the Fabric plan, and it does not survive its own measurement: ENCODED_LEN 16 bytes measured 89,343 cycles -> 352 bytes ckpt.bin 352 / (89343/4096) 16.1 bytes per checkpoint 125,000,000 / 4096 * 16 477 KB 125,000,000 / 89,343 * 352 481 KB 244 KB == 30,518 * 8 an 8-BYTE record 244 KB is what you get from a checkpoint holding only the hash. The implemented record holds the cycle AND the hash, so the figure predates the implementation and nobody re-derived it. The 15,263x ratio is measured and unaffected; only the absolute extrapolation was wrong. Corrected in the live spec documents -- AGENTS.md (both occurrences), docs/mister.md, to-dos/ROADMAP.md -- and explained in the v2.4.2 notes, which is where a reader meets the number. DELIBERATELY NOT corrected: .github/release-notes/v2.4.1.md (a shipped record is not silently rewritten), docs/adr/0037 (a decision record), and the research archive under to-dos/plans/research/. The v2.4.2 notes carry a block naming all three, so the correction is discoverable from the wrong number rather than only from the right one. ## The other five * The obs.bin record count is 89,335 against 89,343 cycles, and the gap is exactly the eight-cycle reset `Nes::from_rom` runs before the trace is armed. Nothing is filtered. Both counts appear in the notes and the boundary between them did not; it does now. * The stream-length check was attributed to `Observable::decode`, which validates ONE 16-byte record. `observables_from_bytes` is what rejects a stream whose length is not a multiple of 16 (checkpoint.rs:302), before any record is decoded. Reattributed. * "No public-API change" was unqualified while rustynes-cosim adds public Rust and C ABI surface. True for every shipped and default-build package, and now says so. * SECURITY.md declared v2.4.2 current in its prose while its table still labelled 2.3.x "The current line" with no 2.4.x row at all -- so the supported-version table, which is the part a reporter actually reads, named the wrong line. Adds a 2.4.x row and moves 2.3.x to Partial. * to-dos/ROADMAP.md carried three stale status markers, two of them actively misleading rather than merely old: line 59 announced "Next up -- v2.4.0 Concordance" for a release that shipped inside v2.4.1 and is deliberately never tagged, and line 100 stated v2.2.6 "Almanac" as the latest release, eleven releases behind. Line 84 still read "In development -- the v2.0.0 tag itself" for a tag pushed on 2026-07-03. Corrected, with 100 and 84 relabelled as historical snapshots rather than deleted. That line-59 finding is worth naming: the same commit that documents why v2.4.0 has no tag left a bullet elsewhere in the tree announcing it as the next release. The release anchors are gated; ordinary status prose is not. ## Verification * release_anchor_audit 8/8, cosim_manifest_audit 4/4, libretro_info_audit 3/3. * markdownlint via pre-commit (pinned v0.39.0): Passed. * No emulation-core change; AccuracyCoin 141/141 (RAM decoder) and nestest 0-diff already verified on this branch and unaffected by a documentation edit. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
`release_anchor_audit` pins 15 fixed markers and fails closed when one goes missing. That is the right shape for THE canonical current-release statement in each document, and it is why a doubled bold marker on this very cut failed loudly instead of silently checking 14 of 15. It cannot cover prose that has no marker, and the review round found that **the drift did not stop when the anchors were gated -- it moved into the prose beside them**: * `to-dos/ROADMAP.md` announced a "Next up" for v2.4.0, a release that shipped inside v2.4.1 and is deliberately never tagged -- in the very change that documents why it has no tag, * the same file still described the v2.0.0 tag as in development, for a tag pushed 2026-07-03, * and `to-dos/README.md` described v1.8.9 the same way, roughly fifteen releases stale, which nothing had flagged at all and which the review did not find either. The gate did. So this is a PATTERN check rather than a marker list: a status label (`Next up`, `In development`, `Planned for`, `Upcoming`) naming a version at or below the workspace version is a contradiction that needs no judgement to detect. ## Discovery needs no list of its own `git ls-files` intersected with `.markdownlintignore`. Tracked files ARE the definition of this project's own content -- the vendored `nesdev_wiki/` beside this checkout is 2,655 untracked markdown files, and a first draft that walked the directory tree examined 3,085 files instead of 225. The frozen-tree list is READ from `.markdownlintignore` rather than duplicated, because a second copy of "which prose is not policed" is precisely the drift this file exists to catch. ## A companion rule was measured and REJECTED "A `latest release` or `the current line` claim must name the workspace version" fires on `docs/ios.md`, which correctly says "The current line is v1.9.9 'Workshop'" -- scoped to the iOS TRAIN, not the project release. The phrase legitimately scopes to a platform line, so the rule cannot separate a stale claim from a correct one without judgement. A gate with false positives gets switched off, which is worse than no gate -- the same sentence already written into `check_rtl_subset.py`. Recorded as a measured rejection in the module docs rather than shipped and tuned. ## Mutation testing changed the design, twice The escape hatch was first "any line containing the word historical". The very first line written against it -- the `to-dos/README.md` fix -- said "this paragraph is a historical snapshot" for unrelated reasons, so M1, the mutation reintroducing the exact defect the gate exists for, came back **NOT CAUGHT**: silently exempted by the prose beside it. An escape claimable by accident fails in the direction of silence, which is the worst direction. The marker became an HTML comment. Then the gate failed on its own CHANGELOG entry, because documenting the defect requires QUOTING it -- the same recursion that once made a commit body explaining the `Closes #N` anti-pattern close an issue. A quotation is not a historical snapshot, so the marker is named `not-a-claim`: it says the line is not asserting state, which is true of both cases. Five such lines exist, all quotations, all printed and counted on every run so growth stays visible. Five mutations, all behaving: M1 bare label on a shipped version FAIL (caught) M1b same line, word "historical" incidentally present FAIL (the loose escape no longer rescues it) M4b explicit `not-a-claim` marker PASS (exempts, on purpose only) M3 label on a FUTURE version PASS (not yet shipped) M6 predicate inverted, defect present PASS (gate inert -- the comparison is load-bearing) Plus fail-closed on an unparseable `.markdownlintignore` and on a short file list, since zero files examined means the discovery is wrong rather than that every document is consistent. ## Also * `to-dos/README.md` corrected -- v1.8.9 shipped 2026-06-25. * Three unit tests pin the version parser, the 60-character window, and that the scanner does not panic on a multi-byte line. That last one is not decorative: these documents are full of em-dashes, and a byte-slicing implementation panics while formatting its own diagnostic, replacing the message explaining the failure with a char-boundary error about the reporting code. ## Verification * release_state_prose_audit 4/4, release_anchor_audit 8/8, cosim_manifest_audit 4/4, libretro_info_audit 3/3. * `cargo fmt --all --check` clean; `cargo clippy -p rustynes-test-harness --all-targets -- -D warnings` clean. * markdownlint via pre-commit (pinned v0.39.0): Passed. * 225 tracked, non-frozen markdown files examined; 5 exemptions, all listed. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014qfTKi2M3swo7qnwvYCkDj
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Cuts v2.4.2 "Cairn" — the rung-0 compare surface of the v2.4.1 → v2.5.0 "Fabric" line.
The emulation core is untouched: no behaviour change to
rustynes-{cpu,ppu,apu,mappers,core}, no new hot-path API, andrustynes-cosimstays excluded from the workspace and absent from the default build. AccuracyCoin 141/141 (100.00%, RAM decoder) and nestest 0-diff were run rather than assumed.What this PR does
Version bump
2.4.1→2.4.2and itsCargo.lockpropagation;[Unreleased]promoted into## [2.4.2] - 2026-08-22 - "Cairn" (checkpoints, and what a device can actually observe); all 15 release anchors across 10 documents moved, each demoting the v2.4.1 text to "built on" rather than overwriting it; aVERSION-PLAN.mdrow with(current)moved off v2.4.1; and a 198-line.github/release-notes/v2.4.2.mdoverride thatrelease-auto.ymlprefers over the CHANGELOG extract.On merge,
release-auto.ymltagsv2.4.2, publishes with those notes, and invokesrelease.ymlto build and attach the desktop binaries.Three gates earned their place, and two of them failed first
release_anchor_auditfailed closed on a defect this PR introduced. TheVERSION-PLAN.mdedit produced**Current release: **v2.4.2— a doubled bold marker — so the pinned marker no longer matched. It refused to report a pass for an anchor it could not find, rather than silently checking 14 of 15. That is exactly the failure mode it was written after.cosim_manifest_auditcaught the price of exclusion thatAGENTS.mddocuments: an excluded package cannot useversion.workspace = true, socrates/rustynes-cosim/Cargo.tomlstill read2.4.1. Its message says so directly — "the crate is excluded, so nothing inherits this for you". Bumped, with its own tracked lockfile regenerated.libretro_info_auditrequired the local.infodisplay_versionto move. Bumped. No upstream PR is opened: the cadence rule limits upstream syncs tovX.Y.0boundaries (next: v2.5.0), and no licence changed here, which is the one override. Keeping the local file current is what makes that eventual sync a copy rather than a re-derivation.On v2.4.0, deliberately not tagged
Checked rather than assumed: the workspace version was never
2.4.0on any commit on any branch (git log --all -S'version = "2.4.0"' -- Cargo.tomlis empty; PR #428's merge commitb67c4f94still reads2.3.9), and there is no## [2.4.0]CHANGELOG section, sorelease-autowould fail loudly by design rather than ship empty notes.No commit exists that a
v2.4.0tag could honestly point at. v2.4.0 "Concordance" shipped inside v2.4.1, which that release's notes andVERSION-PLAN.mdboth record. A skipped version number is permitted by SemVer; a tag pointing at a tree that calls itself something else is not, and retroactively contradicting a shipped release's notes is the same class of record corruption this project retracted in #431. The release notes state this explicitly, under "A note on v2.4.0".Verification
pass rate = 100.00% over 141 assigned testsnestest_pc_c000_matches_golden_log ... okrelease_anchor_auditcosim_manifest_auditlibretro_info_auditcargo fmt --all --checkTest counts confirmed non-zero — a filter matching nothing exits 0.
Compatibility
Additive and default-off throughout. No save-state, movie, netplay, or public-API change;
.rnsand.rnmare unchanged.Summary by CodeRabbit
New Features
.obs.binartifact format with cross-language verification.Documentation