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fix(project): enforce raw schemaVersion integer grammar (#553) - #621

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fix/553-schema-version-raw-integer
Sep 6, 2026
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fix(project): enforce raw schemaVersion integer grammar (#553)#621
qnbs merged 2 commits into
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fix/553-schema-version-raw-integer

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@qnbs qnbs commented Sep 6, 2026

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Part of #553. This causal slice rejects mathematically fractional raw schemaVersion JSON numbers before TS/Rust IEEE-754 rounding can admit them, while preserving integer-valued decimal/exponent spellings such as 1.0 and 1e0. It adds mirrored TS/Rust boundary coverage and reconciles the Core Migration Ledger row 9 with the live Slice A/B status. It does not add ingress authority, canonical raw-carrier writeback, migration, R-15, or Qt scope. Local validation: focused TS 44/44, Rust version_test 27/27, Biome, cargo fmt, and pnpm run ci:prepush PASS.

Summary by Sourcery

Enforce mathematically integral raw schema-version numbers consistently across TypeScript and Rust before numeric rounding occurs.

Bug Fixes:

  • Reject fractional raw schemaVersion JSON numbers before JavaScript or Rust numeric rounding can classify them as valid integer versions.
  • Keep mathematically integer decimal and exponent spellings, such as 1.0 and 1e0, accepted while enforcing the shared non-negative safe-integer domain.

Enhancements:

  • Align TypeScript and Rust schema-version validation through mirrored raw-token grammar checks and boundary behavior.
  • Update the Core Migration Ledger to record persisted-version classification and TypeScript/Rust parity work as implemented.

Documentation:

  • Update the Core Migration Ledger to reflect the current Slice A and Slice B implementation status.

Tests:

  • Add TypeScript and Rust coverage for integer-valued decimal and exponent forms, malformed numeric tokens, and fractional values near the safe-integer boundary.

CodeAnt-AI Description

Reject fractional schema versions before numeric rounding

What Changed

  • Raw schemaVersion numbers are now rejected when they are mathematically fractional, even if JavaScript or Rust rounding would make them appear integral.
  • Integer-valued decimal and exponent forms such as 1.0 and 1e0 remain accepted.
  • TypeScript and Rust now apply the same non-negative, safe-integer rules, including near the 2^53 - 1 boundary.
  • Added matching boundary and parity tests and updated the migration ledger to record the completed classification work.

Impact

✅ Fewer cross-platform schema-version mismatches
✅ Fractional versions no longer bypass validation through rounding
✅ Consistent acceptance of decimal and exponent integer forms

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Summary by cubic

Validates the raw schemaVersion JSON token before any numeric rounding, so fractional literals like 9007199254740991.4 are now MALFORMED instead of rounded and classified as FUTURE, and values that aren't genuine JSON number tokens are rejected. Integer-valued spellings like 1.0 and 1e0 still classify the same as 1.

  • Adds raw-token validation in TS and Rust before any IEEE-754 rounding can affect the result, with mirrored boundary tests.
  • Updates the Core Migration Ledger row 9 to mark Slice A's persisted-version classification as implemented.
  • Adds no ingress authority, canonical raw-carrier writeback, migration, R-15, or Qt scope.

Written for commit ced5721. Summary will update on new commits.

Review in cubic

Summary by CodeRabbit

  • Bug Fixes

    • Improved project schema-version validation across supported runtimes.
    • Correctly accepts mathematically valid non-negative integer versions written in decimal or exponent notation.
    • Rejects negative, fractional, oversized, and otherwise unsafe version values before numeric rounding can misclassify them.
    • Aligns version classification behavior between JavaScript and Rust implementations.
  • Documentation

    • Updated migration tracking to reflect compatibility validation coverage and current implementation status.

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🤖 CodeAnt AI — Review Status

Status Commit Started (UTC) Finished (UTC)
✅ Reviewed your PR 39365e9 Sep 06, 2026 · 07:31 07:34

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Sorry @qnbs, you've used your own review budget of 250,000 diff characters for the last 7 days.

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Project Deployment Actions Updated
worldscript-studio Ready Ready Preview Sep 6, 2026 7:50am UTC

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Reviewer's Guide

The PR hardens schemaVersion admission by validating raw JSON number grammar before TS/Rust IEEE-754 conversion, preserving mathematically integral decimal/exponent forms while rejecting fractional literals that could round into accepted integers; it adds mirrored boundary tests and updates the migration ledger to reflect the live Slice A/B implementation status.

Sequence diagram for raw schemaVersion classification

sequenceDiagram
    participant RawJSON
    participant TS as TypeScript boundary
    participant Rust as Rust boundary

    RawJSON->>TS: classifyRawProjectVersion(rawText)
    TS->>TS: findTopLevelSchemaVersionNumberToken(rawText)
    TS->>TS: isMathematicallyNonNegativeIntegerToken(rawToken)
    TS->>TS: classifyVersionNumber(value)
    TS-->>RawJSON: MALFORMED or classified version

    RawJSON->>Rust: validated_schema_version_number(raw_text)
    Rust->>Rust: is_mathematically_non_negative_integer_token(raw_token)
    Rust-->>RawJSON: accepted version or rejection
Loading

Flow diagram for schemaVersion raw-token admission

flowchart TD
    A[Read raw schemaVersion token] --> B{Mathematically non-negative integer?}
    B -- No --> C[Reject as MALFORMED]
    B -- Yes --> D{Within 2^53 - 1?}
    D -- No --> C
    D -- Yes --> E[Classify schema version]
    E --> F[Preserve integral forms such as 1.0 and 1e0]
Loading

File-Level Changes

Change Details Files
Validate schemaVersion using the raw JSON number token before floating-point parsing.
  • Added mirrored TS and Rust token grammar checks for non-negative integer values, including decimal and exponent spellings that are mathematically integral.
  • Reject fractional literals before IEEE-754 rounding can make them appear integral, while retaining the jointly safe integer bound.
  • Extracted the top-level schemaVersion token in TS and integrated raw-token validation into both classification paths.
features/project/projectSchemaVersion.ts
crates/worldscript-project/src/version.rs
Expand boundary and parity coverage for raw schemaVersion grammar.
  • Added TS and Rust coverage for integer-valued decimal and exponent forms.
  • Changed near-boundary fractional cases to expect MALFORMED before rounding.
  • Retained coverage for the maximum jointly safe integer.
tests/unit/features/project/projectSchemaVersion.test.ts
crates/worldscript-project/tests/version_test.rs
Reconcile migration tracking with the implemented Slice A/B status.
  • Updated the ledger to mark implementation started and document raw-token parity coverage and observation-only ingress status.
  • Clarified that authority switching, canonical raw-carrier writeback, migration, R-15, and Qt scope remain excluded.
docs/native/CORE-MIGRATION-LEDGER.md

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@codeant-ai codeant-ai Bot added the size:L This PR changes 100-499 lines, ignoring generated files label Sep 6, 2026

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This PR successfully implements raw schemaVersion integer grammar enforcement to prevent IEEE-754 rounding from admitting mathematically fractional literals. The implementation maintains TS/Rust parity with mirrored validation logic in both languages, comprehensive test coverage (27 Rust tests, extended TS test suite), and appropriate documentation updates. All tests pass and the code functions correctly. No blocking issues found.


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🏁 CodeAnt Quality Gate Results

Commit: ced5721f
Scan Time: 2026-09-06 07:50:38 UTC

✅ Overall Status: PASSED

Quality Gate Details

Quality Gate Status Details
Secrets ✅ PASSED 0 secrets found, 1 false positive secret suppressed
Duplicate Code ✅ PASSED 0.0% duplicated
SAST ✅ PASSED No security issues
Bugs ✅ PASSED Rating S: No bugs
IAC ✅ PASSED No IAC issues

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Reviewing files that changed from the base of the PR and between 39365e9 and ced5721.

📒 Files selected for processing (3)
  • crates/worldscript-project/src/version.rs
  • crates/worldscript-project/tests/version_test.rs
  • features/project/projectSchemaVersion.ts
📝 Walkthrough

Walkthrough

The change validates raw schemaVersion JSON tokens before floating-point conversion. TypeScript and Rust now accept exact non-negative integers through 2^53 - 1 and reject fractional, negative, oversized, and rounding-sensitive values. Tests cover decimal, exponent, and boundary forms.

Changes

Schema version validation

Layer / File(s) Summary
TypeScript raw-token validation
features/project/projectSchemaVersion.ts, tests/unit/features/project/projectSchemaVersion.test.ts
The classifier extracts the raw top-level schemaVersion token and validates its exact mathematical value before classification. Tests cover decimal and exponent forms and reject fractional values that round to the safe-integer boundary.
Rust validation parity
crates/worldscript-project/src/version.rs, crates/worldscript-project/tests/version_test.rs, docs/native/CORE-MIGRATION-LEDGER.md
Rust applies the same raw-token validation before converting to f64. Tests cover equivalent spellings and boundary rejection. The migration ledger records the implementation and compatibility coverage.

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🟠 High · up to 39365

Malformed projects containing a string such as schemaVersion "1e" can crash checked Rust builds instead of being classified as malformed. This should be fixed and regression-tested before merge.

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly and concisely describes the main change: enforcing raw integer grammar for project schemaVersion values.
Docstring Coverage ✅ Passed Docstring coverage is 84.62% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 4 files. (1 skipped: 1 …
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
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CodeAnt Nitpicks

2 code suggestions

1. Huge valid number tokens are copied into digits before their exponent and size are rejected, allowing oversized input to consume memory and CPU during header classification.

Performance · crates/worldscript-project/src/version.rs:404-405


2. Very large valid schemaVersion tokens are copied and normalized after JSON.parse, causing additional memory and CPU proportional to attacker-controlled token size during classification.

Performance · features/project/projectSchemaVersion.ts:288-295

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Actionable comments posted: 2

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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
In `@crates/worldscript-project/src/version.rs`:
- Around line 428-432: Validate that the exponent token is numeric before
invoking is_mathematically_non_negative_integer_token, returning Malformed for
non-number tokens such as the closing quote in {"schemaVersion":"1e"}; add a
regression test covering this input.

In `@features/project/projectSchemaVersion.ts`:
- Around line 74-76: Add one-line QNBS-v3 comments in
features/project/projectSchemaVersion.ts at lines 74-76 and 288-295: document
that the scanner preserves the raw numeric token before IEEE-754 conversion, and
that classification rejects invalid raw numeric grammar before version routing.
Use the required format `// QNBS-v3: [Grund / Impact / Kreativer Mehrwert]`.

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  • crates/worldscript-project/src/version.rs
  • crates/worldscript-project/tests/version_test.rs
  • docs/native/CORE-MIGRATION-LEDGER.md
  • features/project/projectSchemaVersion.ts
  • tests/unit/features/project/projectSchemaVersion.test.ts

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Comment thread crates/worldscript-project/src/version.rs
Comment thread features/project/projectSchemaVersion.ts
@qnbs
qnbs force-pushed the fix/553-schema-version-raw-integer branch from 39365e9 to ffa2151 Compare September 6, 2026 07:38
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qnbs force-pushed the fix/553-schema-version-raw-integer branch from ffa2151 to de63af8 Compare September 6, 2026 07:45
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Gates Passed
3 Quality Gates Passed

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Codecov Report

❌ Patch coverage is 87.65432% with 10 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines Patch % Lines
features/project/projectSchemaVersion.ts 87.65% 1 Missing and 9 partials ⚠️

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@qnbs
qnbs merged commit 06ba4b0 into main Sep 6, 2026
37 checks passed
@qnbs
qnbs deleted the fix/553-schema-version-raw-integer branch September 6, 2026 08:15
qnbs added a commit that referenced this pull request Sep 9, 2026
…cal PR-shaped refs

Two genuine gaps from codex-connector review:

- reserveEntryForNumberedCommit's "skip reservation when an entry lists
  multiple PR numbers" carve-out was itself the bug: it left such an
  entry fully unreserved, so an unrelated un-numbered commit's slug
  match could still reuse it. Each numbered commit referencing that
  entry now reserves it independently (a Set, so idempotent) - no
  carve-out needed, since numbered commits never go through slug
  matching regardless.

- classifyGovernedCommit treated any commit ending in "(#NNN)" as an
  already-merged PR number, even on a feature branch where that token
  may only be an in-flight issue reference GitHub hasn't yet replaced
  with the real squash-merge PR number (this repo's own history shows
  the eventual form "... (#553) (#621)"). Added getBranchLocalCommitCount
  (git merge-base against origin/main, falling back to a local main) so
  commits unique to the current branch are exempted from the exact-PR-
  match requirement entirely, while commits already reachable from main
  stay fully enforced.

Also condensed several QNBS-v3 comments (including one from the prior
commit) down to the required single physical line.
qnbs added a commit that referenced this pull request Sep 9, 2026
…674)

* fix(docs): upgrade CHANGELOG completeness check, backfill Unreleased

audit F-2: scanUnreleasedTruth's own gate fired only when [Unreleased]
was entirely empty, so a single unrelated doc-sync bullet satisfied
"meaningful content" forever — 13 real feat/fix commits since v1.28.4
went completely undocumented, and the gate never noticed.

- scanUnreleasedTruth now requires every post-tag feat|fix|perf commit
  to be individually referenced in [Unreleased], either by its
  trailing PR number (the mid-subject issue ref some commits also
  carry, e.g. "(#553) (#621)", is correctly ignored in favor of the
  true trailing PR number) or by a bounded subject-slug match (>=60%
  of its most identifying words) for the few commits merged without
  one. Missing commits are named in the failure output.
- Backfilled CHANGELOG.md's [Unreleased] with all 13 currently-
  undocumented commits since v1.28.4 (project schema-version
  classification Slices A/B, the canonical document-projection
  foundation, the legacy-to-v1 admission primitive, filesystem-
  admission convergence, i18n startup-copy fixes, PR-size governance
  hardening, the attribution guard, and this session's own PR-1
  security-doc fix).
- Pulled TODO.md's Current Sprint forward: the 5 landed ledger-row-9
  PRs are now named, still correctly marked not-complete (no target
  release invented — none exists yet).
- 6 new regression tests for the completeness logic; README
  test-count resynced.

* fix(docs): address review findings on the completeness-check upgrade

- PR-number matching used a bare String.includes, so "#65" could
  incorrectly satisfy "#656" and vice versa. Now requires a non-digit
  boundary on both sides.
- Subject-slug matching now runs per Markdown entry (bullet, including
  wrapped continuation lines) instead of against the whole [Unreleased]
  section — words scattered across unrelated bullets could otherwise
  collectively satisfy a commit none of them documents, and one
  generic bullet could simultaneously "document" multiple different
  undocumented commits.
- P1: full per-commit completeness is now enforced only outside
  pull_request CI context. A pull_request run's git-log range
  enumerates every commit unique to that branch, not the one commit
  that will actually exist after squash-merge — a routine review-fix
  follow-up commit can't reference itself in [Unreleased] in advance.
  The section-non-empty check still applies in pull_request context;
  full completeness is enforced locally and on push to main right
  after merge.
- 8 new regression tests; GITHUB_EVENT_NAME declared in turbo.json;
  README test-count resynced.

* fix(ci): stop scanUnreleasedTruth from reading GITHUB_EVENT_NAME as its own default

The isPullRequestContext parameter defaulted to reading
process.env.GITHUB_EVENT_NAME directly. That env var is set by GitHub
Actions for the WHOLE workflow run, not just this gate's own CLI
step -- so when the full Vitest suite ran inside this PR's own
pull_request-triggered Quality Gate job, every test that didn't
explicitly pass isPullRequestContext silently got the lenient
(GITHUB_EVENT_NAME=pull_request) default instead of the intended
deterministic one, failing 7 tests that expected the strict path.

The pure function's default is now a hardcoded false; only main()'s
real CLI invocation reads the actual environment. Verified locally by
simulating the exact failure with GITHUB_EVENT_NAME=pull_request
pnpm exec vitest run -- reproduced the same 7 failures before this
fix, all pass after it.

* fix(docs): address 2nd review wave on the completeness-check upgrade

- P1: the pull_request-context exemption previously skipped strict
  enforcement for EVERY governed commit. Now only an un-numbered
  commit is exempted -- an already-numbered commit sitting in the
  same range from a separate, already-merged PR stays fully enforced
  even during a pull_request run.
- Renamed isPullRequestContext to isFeatureBranchContext and added
  isOnFeatureBranch(): the mandatory local `pnpm run ci:prepush` hook
  invokes this checker with no GitHub Actions event context at all, so
  GITHUB_EVENT_NAME alone left every local review-fix commit strictly
  enforced and unsatisfiable in advance. Checking the actual git
  branch (not just the CI event) means the same exemption now applies
  locally too, on the same reasoning: HEAD not being `main` is what
  actually distinguishes "not yet permanent history" in both contexts.
- A matched changelog entry is now claimed and excluded from later
  commits in the same pass, so one generic bullet can't simultaneously
  "document" multiple different undocumented commits -- verified with
  a case specific enough that both commits would clear the 60%
  threshold alone.
- A commit ending in a trailing PR number now requires that exact
  number; it no longer falls back to a slug match that could hit a
  different, older, unrelated bullet.
- ci.yml's Quality Gate checkout gains fetch-depth: 0 alongside its
  existing fetch-tags: true -- the latter makes a tag ref resolvable
  but doesn't deepen the commit graph, so `git log v<tag>..HEAD` could
  fail or truncate on a shallow checkout, which getPostReleaseCommitSubjects()
  would silently treat as "no history" and skip the whole completeness
  check without ever reporting a failure. Unverifiable from existing
  CI history until this PR's own post-merge push (no push-to-main run
  had exercised the new completeness logic yet) -- applied as a
  correctness fix regardless of prior symptoms.
- My own earlier three CHANGELOG bullets for this feature had drifted
  into exactly the "one bullet documents multiple commits" shape the
  exclusive-claiming fix above now rejects -- restructured into
  separate, distinct bullets.
- 9 new regression tests (exclusive claiming, exact-PR-number
  requirement, un-numbered-vs-numbered PR-context enforcement,
  isOnFeatureBranch against real git repos); README test-count resynced.

* fix(docs): replace greedy slug-entry claiming with maximum bipartite matching

Greedily claiming the first matching entry per commit was order-
dependent: a fully documented changelog could be wrongly rejected
depending only on which commit happened to be checked first. Example:
entries "Alpha beta gamma delta" / "Alpha beta epsilon zeta" against
subjects "alpha beta gamma delta epsilon zeta" then "alpha beta gamma
delta" -- the broader subject greedily claims the only entry the
narrower one can use, even though swapping which entry each takes
documents both.

Replaced with Kuhn's algorithm (augmenting-path maximum bipartite
matching between un-numbered commits and changelog entries), which
finds the best possible assignment regardless of input order. A
numbered commit is unaffected -- it never participated in slug
matching in the first place, per the prior commit's exact-PR-match fix.

2 new regression tests proving the exact adversarial case in both
commit orders; README test-count resynced.

* fix(docs): flatten completeness-check nesting, fix detached-HEAD and self-reference gaps

- Extract classifyGovernedCommit() so findUndocumentedGovernedCommits is a flat
  loop with no nested conditionals (CodeScene Bumpy Road Ahead).
- isOnFeatureBranch() now treats detached HEAD (the literal string actions/checkout
  leaves for every event, push included) as non-feature-branch, so push-to-main
  runs never get silently exempted from full completeness enforcement.
- Add this PR's own eventual squash-merge PR number to the CHANGELOG bullet it
  documents, since the exact-PR-match-required rule would otherwise fail this
  PR's own post-merge CI run.

* test(docs): cover detached-HEAD case for isOnFeatureBranch

Adds the regression test for the detached-HEAD fix in 0c9291c that a
prior reply to the review thread had already described as included -
it was written but not actually committed in that push. Resyncs
README.md's test-count metric for the added test.

* fix(docs): reserve a numbered commit's changelog entry from slug-match reuse

A numbered commit's exact PR-number match never touched entryOwner, so an
unrelated un-numbered commit's slug match could reuse the same bullet and
go undetected as undocumented. Reserve the entry a numbered commit's PR
reference resolves to before slug matching runs, unless that entry
explicitly bundles multiple PR numbers (deliberately shared documentation).

* fix(docs): reserve multi-PR entries fully, exempt in-flight branch-local PR-shaped refs

Two genuine gaps from codex-connector review:

- reserveEntryForNumberedCommit's "skip reservation when an entry lists
  multiple PR numbers" carve-out was itself the bug: it left such an
  entry fully unreserved, so an unrelated un-numbered commit's slug
  match could still reuse it. Each numbered commit referencing that
  entry now reserves it independently (a Set, so idempotent) - no
  carve-out needed, since numbered commits never go through slug
  matching regardless.

- classifyGovernedCommit treated any commit ending in "(#NNN)" as an
  already-merged PR number, even on a feature branch where that token
  may only be an in-flight issue reference GitHub hasn't yet replaced
  with the real squash-merge PR number (this repo's own history shows
  the eventual form "... (#553) (#621)"). Added getBranchLocalCommitCount
  (git merge-base against origin/main, falling back to a local main) so
  commits unique to the current branch are exempted from the exact-PR-
  match requirement entirely, while commits already reachable from main
  stay fully enforced.

Also condensed several QNBS-v3 comments (including one from the prior
commit) down to the required single physical line.

* refactor(docs): flatten main() into a sequence of scanRequiredFiles calls

CodeFactor flagged main() as a Complex Method (five near-identical
read-file/handle-missing/scan loops). Extracted scanRequiredFiles() so
each loop becomes one call; behavior is unchanged (verified via
node scripts/check-doc-metrics.mjs and the full test suite).

* fix(docs): classify branch-local commits by ancestry, guard negation polarity, restrict PR matches to entries

- getBranchLocalSubjectIndices replaces the positional branchLocalCount
  heuristic with a per-commit git merge-base --is-ancestor check, so an
  interleaved main commit (from a branch that merged main back in) is
  never misclassified as branch-local.
- candidateEntryIndices now disqualifies a changelog entry whose negation
  polarity (not/never/no longer/...) differs from the commit description's,
  so a negated commit can no longer slug-match its semantic opposite.
- classifyGovernedCommit checks parsed [Unreleased] bullet entries instead
  of the raw section text, so a PR number mentioned only in surrounding
  prose no longer counts as documentation.

* fix(docs): reject PR-number-boundary letters, typographic apostrophes, and multi-entry reservation gaps

- isReferencedByPrNumber now rejects any word-character continuation after
  the PR number (not just a digit), so a hex-color-like token such as
  #999abc no longer satisfies an exact reference to PR #999.
- NEGATION_MARKER now matches typographic apostrophes (don't) alongside
  straight ones, so a curly-quote contraction is still recognized as negation.
- reserveEntryForNumberedCommit reserves every changelog entry referencing a
  numbered commit's PR, not just the first match, closing a gap where a
  second entry for the same PR was free for an unrelated slug match.
- getBranchLocalSubjectIndices now only classifies a commit as branch-local
  on git's documented exit code 1 (confirmed non-ancestor); any other
  merge-base failure fails closed to the stricter, non-exempted path.
- Corrected a stale comment that no longer matched the scanRequiredFiles
  calls it was describing after they were consolidated.

* fix(docs): recognize avoidance-verb negation and stop truncating slug words

- NEGATION_MARKER now also matches avoid/prevent (and their inflections),
  so a preserve-first commit worded without a literal not/never still
  gets polarity-guarded against an opposite-meaning changelog entry.
- significantSlugWords no longer truncates to the first six words; a
  truncated word list could let a partial-overlap ratio wrongly clear the
  60% threshold when the full word list would correctly fall below it.

* fix(docs): scope branch-local exemption to actual locality, extend refusal-verb polarity, preserve short discriminator tokens

- classifyGovernedCommit's un-numbered exemption now requires isBranchLocal
  too, not isFeatureBranchContext alone, so a commit already reachable from
  main can no longer get a free pass just because the checkout is on a
  feature branch.
- NEGATION_MARKER now also covers refuse/stop/disable (and inflections).
- hasNegationMarker now scopes its check to an entry's **bold** lead claim
  when present (this file's own changelog convention for the actual
  documented change), so a negation word in trailing rationale/context
  prose no longer disqualifies an otherwise-matching entry — found via a
  real false positive this fix produced against this repo's own CHANGELOG.
- significantSlugWords no longer discards a short alphanumeric token (a
  version, a limit) purely for being <=2 characters when it contains a
  digit.

Residual, intentionally out of scope: a short token that IS retained (e.g.
"v2" vs "v1") can still clear the 60% overlap ratio in a longer sentence
where only that one token differs, the same structural tolerance already
documented for the wave-3 truncation fix. Closing that fully would require
identifier-aware or antonym-pair comparison, which is the general semantic
parsing this file's design explicitly avoids.

* fix(docs): sync TODO ledger-row-9 enumeration with CORE-MIGRATION-LEDGER.md row 9 (4 items, not 3)
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