feat(footers): add a non-blocking footer shape signal - #3682
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Recognise footer-shaped blocks by shape rather than by wording, and surface files whose trailing zone holds two or more of them. The wording-based deduper in footer-policy.js can only see footers whose text is in its pattern list; a footer that is absent from that list is invisible to it, and those are exactly the files that end up carrying two different footers. The signal is separate from the dedupe findings and never changes any file. It is advisory because the measured false-positive rate is high: across all 11,474 tracked Markdown files it flags 930, of which 650 are genuine duplicate-footer problems and 280 (30.1%) hold no known footer at all, mostly report metadata blocks. Recall is 98.3% (650 of the 661 files that do carry two known footer phrases in the trailing zone), so it complements the wording check rather than replacing it. Because 30.1% is far too high to gate on, the Footer Duplicate Guard emits ::warning annotations in its own step and the job continues. Recognition is judged per block rather than per file, so a known footer cannot mask an unrecognised one sitting beside it in the same file. --shape is rejected together with --fix, and block text is ordered with the unrecognised entries first so they survive the report's character budget. Refs #3451
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughThe change adds detection for repeated footer-shaped blocks in Markdown and reports them separately from wording-based deduplication. It adds a measurement tool, npm commands, an advisory workflow check for changed Markdown files, tests, and documentation. ChangesFooter Shape Signal
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Workflow as GitHub Actions workflow
participant Dedupe as dedupe-footers.js
participant Detector as footer-shape.js
Workflow->>Dedupe: Request JSON shape report for changed Markdown files
Dedupe->>Detector: Find repeated trailing footer-shaped blocks
Detector-->>Dedupe: Return blocks and recognition status
Dedupe-->>Workflow: Return shape findings
Workflow->>Workflow: Warn for unrecognised findings
Merge Risk: 🔵 Low · up to The shape check remains advisory and the existing duplicate-footer check remains in place. Correct the measurement and guide before relying on their accuracy figures; these issues do not appear to block use of the advisory warning. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The existing duplicate-footer check remains a separate gate, and the new signal does not rewrite files. A specially named Markdown file could, however, alter the advisory messages shown in CI. The job has read-only permissions, limiting the impact. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Hardening Proposals
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Inline comments:
Review comments at @.github/workflows/documentation.yml:
- Line 441: Update the notice command in the footer shape signal summary to use
the required title/message separator, matching the correct separator used by the
notice at line 430.
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Two defects in the footer shape signal. The workflow command announcing the signal wrote "::notice title=Footer shape signal==", using "==" where GitHub requires "::" to separate the title from the message. The runner never split the two, so the annotation rendered with the whole string as its title instead of appearing as a notice. The step does not fail either way, which is why a test is the only thing that catches it: the suite now asserts every workflow command in the file separates its title from its message, and that no command uses "==" as a separator. The shape detector had no fence mask, so a footer-shaped line inside a fenced code block was counted as a footer-shaped block. That points a maintainer at documentation *showing* the footer shape rather than at a file that needs reconciling, and it is a false positive in a signal that already measures its false-positive rate. The wording-based deduper in dedupe-footers.js refuses to touch fenced content for exactly this reason, so the shape path now does too. computeFenceMask is copied rather than imported, because dedupe-footers.js imports this module and an import back would close the cycle. The copy is noted in a comment as the second place to change when fence semantics change. While writing it the first version marked only the delimiter lines and not the lines between them, which is why the fenced case still reported a block until the interior was masked too. Candidate lines now carry their document index explicitly instead of re-deriving it from a slice offset, which is where an earlier version of the filter looked up the wrong line once a heading narrowed the zone. Verified non-vacuous: 3 of the new shape tests fail against the unfixed module, and the workflow-command test fails against the malformed separator. Full suite 298 suites, 6180 tests, 0 failures. actionlint clean, semgrep 0 findings.
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @scripts/agents/includes/footer-shape.js:
- Around line 142-209: Update the heading scan in findTrailingFooterShapedBlocks
to ignore ATX headings inside fenced code blocks by checking the corresponding
document index in fenceMask before updating lastHeading. Keep the existing
candidate filtering and heading behavior for headings outside fences unchanged.
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The heading scan in findTrailingFooterShapedBlocks did not consult fenceMask, so an ATX heading shown inside a fenced example set lastHeading. The candidate loop then discarded every line above it, which hid real footer-shaped blocks from the report entirely: a file carrying two genuine footers followed by a fenced example whose first line is a heading was reported as clean. Consult the mask in the heading scan for the same reason the candidate loop already consults it. An unfenced heading still narrows the zone, so section content above a real heading is still not counted as a footer. Measured on the corpus (11,474 tracked Markdown files), before and after the fix the signal flags the same 899 files and the flagged set is byte-identical, so no documented figure changes. The regression test uses a synthetic input because no file in the corpus exercises this path. Refs #3451
This module keeps its own copy of computeFenceMask because importing the one in dedupe-footers.js would close an import cycle, and its own docstring requires the two to stay in step. They had drifted on one branch: for a backtick fence whose info string contains a backtick, dedupe-footers.js leaves the line unmasked and opens nothing, while this copy masked it. dedupe-footers.js is the intended behaviour, not an accident: it is asserted by its own test suite and stated as a deliberate CommonMark fix in the #3588 description. So this copy is the one that drifted, and it is new in this change. A line matching that branch always starts with a backtick run, so it can be neither an ATX heading nor a single-line emphasised phrase. The drift was therefore invisible in this module's output: measured over the corpus before and after, the signal flags the same 899 files, 644 of which carry two known footer phrases, at 28.4% and 98.0% recall. That is why it needs a unit test rather than a corpus measurement, so computeFenceMask is now exported here as the docstring already described, and the two copies are compared directly: they agree on all 1,657,490 lines of the 11,474 tracked Markdown files. Refs #3451
The candidate list has fenced lines removed, so the next candidate is not necessarily the next line. A bare link line separated from the footer phrase by a code fence was still joined into the block, so the report showed one block spanning the fence, which reads as a single footer where the file has two separate things. Require the document index to be consecutive before treating the next candidate as part of the block. The block count is unaffected: a link line on its own is never a footer phrase, so it is skipped either way. Measured over the corpus before and after, the signal flags the same 899 files, 644 of which carry two known footer phrases, at 28.4% and 98.0% recall. Refs #3451
The accuracy figures quoted in docs/FOOTER_REMEDIATION_GUIDE.md were produced by a throwaway script outside the repository, so nobody could re-run them. When the corpus changed the numbers went stale silently: the guide still said 930 flagged when the same measurement on the current tree gives 899. This moves the measurement into the repository as `npm run measure:footers:shape`, which prints the tree it ran on so a claim in the guide can always be checked. On this tree it reports 11,474 tracked Markdown files, 899 flagged, 644 of them carrying two known footer phrases, 255 (28.4%) carrying none, and 98.0% recall (644 of 657). It also exposes where the recall figure comes from. The ground-truth list is built from the footer configuration, plus a handful of wordings this repository writes but no configuration file declares, and the output now reports what each of those contributes. One of them, "Maintained by the Automation Team", accounts for 557 of the 657: without the hand-curated list the configuration alone yields 4. Recall against a list this dependent on a single string is agreement with that list, not an independent accuracy measure, and the guide now says so rather than quoting 98.3% as though it were one. Refs #3451
The guide quoted 930 flagged, 650 genuine duplicates, a 30.1% false-positive rate and 98.3% recall. Those were measured on b115c44 and were correct there; the corpus has since changed, and the same measurement on this branch gives 899 flagged, 644 carrying two known footer phrases, 255 (28.4%) with none, and 98.0% recall. The figures are stale, not wrong. Each figure now states its definition, the tree it was measured on, and the command that reproduces it, because the numbers were previously produced by a script outside the repository and drifted silently. Two claims are corrected rather than carried over. "650 are genuine duplicate-footer problems" overstated it: 650 is the overlap between the flagged set and a list of known footer phrases, which is not a judgement that the file is wrong. And recall is agreement with that list rather than an independent accuracy measure — the list is dominated by one hand-curated phrase worth 557 of its 657 files, and removing it drops the ground truth to 100. The guide says so, and notes the 28.4% is a lower bound on the real false-positive rate. The stale 29.9% in the dedupe test comment is corrected to the measured 28.4%, and the comment now names the command. Refs #3451
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Actionable comments posted: 4
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @docs/FOOTER_REMEDIATION_GUIDE.md:
- Around line 285-286: Update the revision attribution and measurements in the
guide’s table so they match the tracked Markdown files at the revision that
produced the current figures. If the current table was not measured at the
attributed revision, rerun the measurement and record the resulting figures and
revision consistently.
- Around line 293-296: Update the documentation describing noKnownFooter /
flagged to identify it as the share of flagged files with no known footer
phrase, not an estimate or bound of the false-positive rate; note that unknown
phrases may be real duplicates and known phrases are not independently validated
positives.
Review comments at @scripts/measure-footer-shape.js:
- Line 189: Update the ground-truth window in the code around
`content.split('\n')` to remove the trailing empty element when content ends
with a newline before selecting the last `ZONE_LINES` lines. Keep the selection
limited to `ZONE_LINES` so it matches the signal window.
- Line 166: Update measure(repo) to pass its repo argument to
buildPhraseInventory so the inventory and file list come from the same
repository, including fixture repositories.
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…label Four findings from the review of the measurement script, all valid. The ground truth took its trailing eight lines without dropping the empty element a trailing newline leaves behind, so for almost every file it read seven real lines where the signal reads eight. The two sides of the recall figure were not comparable. Fixed, and the test fails without the fix: both fixture phrases sit on the eighth-from-last real line, so neither is in a seven-line window. This moves the ground truth from 657 to 666 and recall from 98.0% to 96.7%; the flagged count, the two-known count and the no-known-footer share are unchanged. measure(repo) built its phrase inventory from the default checkout rather than from the tree it was handed, so measuring any other tree scored it against this repository's footers. The fixture test now proves the configuration comes from the tree under test. 28.4% is reported as a false-positive rate. It is not one, and it is not a bound on one: a genuine duplicate whose wording is missing from the phrase list is counted there, and a file holding known phrases is not independently confirmed either, so the errors do not cancel. Renamed to "no-known-footer share" in the script output and corrected in the guide. The guide attributed its figures to a revision whose own text still quoted the old numbers. It now records 2f47480, the tree the current table was measured on, and the guide, the dedupe comment and the test comment all carry the same figures. Refs #3451
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@coderabbitai review The four findings from the 11:15 pass are fixed in |
Stale: the single thread this review raised (malformed ::notice in documentation.yml) was fixed in 61bae34. Both notices now read ::notice title=Footer shape signal:: with the required :: separator, confirmed present at b425975 (documentation.yml:415 and :441). Thread resolved.
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Reviewed at head b42597578a. All anchored threads are resolved; the 11 still-unresolved threads in this review have no anchor and are CodeRabbit/Action status messages, which resolve_diff_thread cannot act on, so I am replying here rather than resolving them.
CodeRabbit GitHub threads: 6 raised, 6 resolved, 0 open.
4124588680(malformed::notice) — fixed61bae344c0; both notices verified atb42597578a(documentation.yml:415, :441).4130733197(ATX heading inside a fence) — fixedf68bb3cf93. Two genuine footer blocks followed by a fenced# Example headingreturned 0 blocks before, 2 after (lines 3 and 5), LF and CRLF.4132766001,4132766016,4132766044,4132766056— fixedb42597578a: ground-truth window,repopassed tobuildPhraseInventory, the no-known-footer label, and the recorded revision. Each was valid; details and reproduction are in the replies on those threads.
Three CHANGES_REQUESTED reviews, all dismissed on evidence: 5341643952, 5349089902, 5351659675. Each dismissal message names the fixing commit and the reproduction. None rests on a CodeRabbit re-approval — the CLI is rate limited (3 included reviews per day, exhausted) and is being skipped rather than retried.
Final reconciled figures (npm run measure:footers:shape, tree 2f474806e0, 11,474 tracked Markdown files):
| Figure | Value | Definition |
|---|---|---|
| Flagged | 899 | Trailing zone holds 2+ footer-shaped blocks. Identical to npm run validate:footers:shape. |
| Two known | 644 | Flagged, and the trailing 8 lines hold 2+ distinct known footer phrases. |
| No known footer | 255 (28.4%) | Flagged, with no known footer phrase in the trailing 8 lines. |
| Recall | 96.7% (644 of 666) | Of files carrying 2+ known footer phrases, how many the signal flags. |
Reconciliation. The previously published 930 / 650 / 280 / 30.1% / 98.3% was measured on b115c445f5 and was correct there. I reproduced it exactly by re-running the original script, then found the figures moved for two separate reasons:
- Corpus drift. 31 Markdown files changed under the numbers (#3665 removed real duplicates, plus merges). Ground truth fell 661 → 657 before any of my work.
- A window bug in the measurement, mine. The ground truth took 8 lines without dropping the empty element a trailing newline leaves behind, so it read 7 real lines where the signal reads 8. Fixing it moved ground truth 657 → 666 and recall 98.0% → 96.7%. The flagged count and the 28.4% share never moved.
Two claims are corrected rather than carried over. "650 are genuine duplicate-footer problems" overstated it — 650 was the overlap between the flagged set and a phrase list, not a judgement that the file is wrong. And 28.4% is a share, not a false-positive rate and not a bound on one: unknown-wording files may be real duplicates and known-phrase files are not independently validated, so the errors do not cancel. The guide now says so.
Recall is not an independent accuracy measure, and the guide says so. Ground truth is built from the same inventory the signal uses to decide recognised, so a footer missing from that list is invisible to both sides at once. The list is also lopsided: one hand-curated phrase, Maintained by the 🤖 LightSpeedWP Automation Team, accounts for 534 of the 666 ground-truth files. Remove it and the figure collapses to 132; the configuration-derived phrases alone yield 4. The measurement script now prints that breakdown so the weight is visible.
The measurement itself moved into the repository (scripts/measure-footer-shape.js, npm run measure:footers:shape, 12 tests) precisely because these figures previously came from a throwaway script outside it and went stale silently.
Validation. 181 footer tests across 7 suites pass. ESLint clean on changed files. Semgrep 0 findings over 119 rules. CI green on b42597578a.
Not merged.
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Retrospective gate record — tracked in #3688. What was missing at merge time. This pull request merged without a Retroactive CodeRabbit review result. Re-run on the merged diff with Retroactive outcome. Fixed in #3689, which also carries the two findings from #3604. This pull request is not reverted and nothing here depends on it changing further. One observation, not fixed. "Auto-regenerate Documentation" failed on this merge commit ( Run 36567389709. Merges that did not touch workflows passed. Recorded in #3688 as an observation, with no fix applied. |
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Summary
Adds a separate, read-only footer shape signal: it recognises footer-shaped
blocks by shape rather than by wording, and reports files whose trailing zone
holds two or more of them. The wording-based deduper can only see footers whose
text is in its pattern list, so a footer missing from that list is invisible to
it — and those are exactly the files that end up carrying two different footers,
which is the residue left after the #3451 cleanup.
The signal is advisory: it never changes a file and never fails a build, because
28.4% of the files it flags carry no known footer phrase at all.
Linked issues
scripts/dedupe-footers.jsrecognises footers by wording, from the closed pattern list infooter-policy.js. That list covers the branding footers and little else, so it cannot see the configured taxonomy in.github/config/quirky-footers.yamlor the lists in.github/footers.yml. A footer whose wording is absent from the pattern list is invisible to the deduper — and those are exactly the files that end up carrying two different footers, which is the residue left after the #3451 cleanup.What this adds
A second, independent check that looks only at the shape of a file's trailing zone (the last eight lines, narrowed to after the last heading) and reports any file holding two or more footer-shaped blocks: a short emphasised standalone line, optionally followed by a bare link line.
It is deliberately separate from
footer-policy.js, and the existing dedupe findings, the--fixpath and the--checkgate are all untouched. The signal is collected for every file scanned, including files the deduper passes cleanly, and is reported under its ownshapeFiles/shapeFindingsfields.Measured behaviour
Reproduce with
npm run measure:footers:shape, which prints the tree it ran on. The figures below were measured at2f474806e0, across all 11,474 tracked Markdown files.npm run validate:footers:shape.Status: READY FOR EXECUTION.The 255 are dominated by report and project metadata blocks —
Status: READY FOR EXECUTION,Generated by Claude Haiku 4.5 on 2026-08-10,Co-Authored-By: ...,Training Guide v1.0 - 2026-08-18. They were classified exhaustively rather than sampled, because there were few enough to read.Two things these figures do not say
28.4% is a share, not a false-positive rate, and no rate follows from it. A file carrying a real duplicate footer whose wording is missing from the phrase list lands in that number, and a file holding known phrases is not independently confirmed to be a genuine duplicate either, so the two errors do not cancel. What it does establish is the practical point: roughly seven files in ten that this signal flags do carry a known footer, which is why it is worth a human reading them and not worth a build failing on them.
Recall is agreement with a phrase list, not an independent accuracy measure. Ground truth is built from the same footer inventory the signal uses to decide whether a block is
recognised, so a footer whose wording is missing from that list is invisible to both sides at once. The list is also lopsided: one hand-curated phrase,Maintained by the 🤖 LightSpeedWP Automation Team, accounts for 534 of the 666 ground-truth files. Remove it and the figure collapses to 132; the configuration-derived phrases alone yield 4.npm run measure:footers:shapeprints that breakdown, so 96.7% should be read as "the signal does not miss the footers this list knows about", not as a general accuracy claim. Treat the signal as advisory in both directions: it neither proves nor rules out a duplicate.Why the earlier figures changed
An earlier revision of this description quoted 930 flagged / 650 / 280 / 30.1% / 98.3%. Those were measured at
b115c445f5and were correct there — re-running the original script at that commit reproduces 930 / 650 / 280 / 30.1% / 661 / 98.3% exactly. They moved for two independent reasons:The measurement now lives in the repository as
scripts/measure-footer-shape.jswith 12 tests, because it previously ran from a throwaway script outside it and went stale silently.Why it does not gate
28.4% carrying no known footer is far too high to fail a build on: it would flag roughly three files in ten. So the Footer Duplicate Guard emits
::warningannotations from its own step and the job continues. Nothing is ever rewritten —--fixleaves a signal-only file byte-identical, and there is a test asserting exactly that.Notable details
dedupe-footers.jsand the two are compared directly in tests; they agree on all 1,657,490 lines of the corpus.--shapeand--fixare rejected together. Otherwise the tool would rewrite files while printing only the advisory report, leaving no way to tell that anything changed.Usage
Changelog
CHANGELOG.mdentry under[Unreleased] -> Added.Test plan
CHANGES_REQUESTEDreviews are dismissed on evidence — each dismissal names the fixing commit — not on a CodeRabbit re-approval; the CLI is rate limited (3 included reviews per day) and was skipped rather than retried, and the GitHub app does not re-review incrementally here.b42597578a.Findings fixed during review
An early off-by-one where a terminal newline consumed a slot in the trailing window; zero-based line numbers;
--shapeparsed but never honoured; per-file rather than per-block recognition; report truncation dropping the unrecognised text; a malformed::notice; an ATX heading inside a fence hiding real footer blocks; divergence between the twocomputeFenceMaskcopies; a link line joined across a code fence; the ground-truth window bug above;measure(repo)scoring a foreign tree against this repository's configuration; and two documentation claims that overstated what the figures measure.Checklist (Global DoD / PR)
CHANGELOG.mdupdated under[Unreleased]Refs #3451