feat(tools): the verification stack — replay gate, census, harvest, scheduled sweep

[Gunther-Schulz]

Stacked on #273 (includes #272+#273 — the tests exercise both extensions). Pairs with #275, which produces the capture format these tools consume. Review the tip commit.

Why

#272/#273 ship mitigations with our evidence in the PR bodies. This PR ships the machinery that produced that evidence, so any user of this proxy can verify it against their own traffic instead of trusting ours — and so regressions surface on a schedule instead of on the next bill.

What

• tools/replay.mjs — re-runs the real extension pipeline offline over a capture (from feat(capture): pre-pipeline request capture + source/gate provenance on /health #275). Per-extension mutation attribution by hashing between stages; four cross-request invariants (stability, safety, sequence, canonical order); fidelity against the recorded forwarded-body hashes — five populations reported separately, because 0/0 must never read as "checked and clean"; --census classifies every consecutive same-conversation pair and prices mitigation gaps in re-billed bytes. --restart-at N / --wipe-state-at N simulate proxy restarts and state loss at any point in the corpus.
• tools/harvest.mjs — promotes structurally novel capture pairs into sanitized, committable fixtures (content stripped to structure). Novelty is judged against per-machine ledgers, so multiple machines contribute classes without duplication. The fixtures in this PR were produced by it and audited before publishing.
• tools/gate-live.mjs — runs the replay gate over live captures on a schedule, under the serving gate set read from the running unit (never extension defaults — we spent a day verifying a pipeline nobody ran). One heap-capped child per capture: the cap doubles as a memory-regression check, proven red on a real defect. Writes a status JSON for monitoring.
• tools/cache-sim.mjs — prices post-pipeline bytes against raw, per conversation.
• tools/read-lines.mjs — shared pull-based line reader. Node's readline async iterator buffers the entire remaining file once the consumer awaits (measured: 3.27 GB peak on a 1.5 GB capture, in code that called itself streaming). The bite test pins bytesRead against consumed bytes; against the readline shape it fails on line 3.
• docs/dev-loop.md — the working discipline the tools enforce (replay the serving config; rule out the instrument before reporting a defect; never hand-roll identity in a probe; a checker has three answers). Optional — happy to drop it if you'd rather keep docs lean.

Evidence

72 tests, all green on this branch. In production: the gate found two real defects in our own extensions in live traffic within its first day (both root-fixed in #272/#273's histories), and the fidelity check validated the replay against production wire bytes (109/109 on a fresh session). Daily sweeps currently run over ~2.5 GB of captures in under 4 minutes.

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[Gunther-Schulz]

Refreshed the branch to the tools' current state (single commit, 995312a) — the important part: as originally opened, this PR shipped a safety checker with a bug we've since found and fixed (the declared-injection exemption filtered the output side only; an input already carrying an injection-shaped message — e.g. a chained proxy fed this pipeline's own output — read as a message drop nobody made; our first code-stamped sweep caught it in production use). The refresh also brings the pieces the daily sweep grew this afternoon: conversation-boundary classification (compaction/resume/fork with pricing), human-anchor annotation on edit rows, harvest's dormant-class shape watch + growth-step snapshots with their verdict CLI, and the sweep hardening (census on every run, proves-nothing rows, source fingerprints stamped into the verdict). 93 tests on the branch, all green. proxy/source-fingerprint.mjs is shared with #275 — identical file, merges cleanly in either order, same precedent as the fixtures shared with #278.

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[Gunther-Schulz]

Pushed 93203c9: replay now measures the OUTPUT side. The mitigation metric had trusted the extension's input-side self-report; a pair could read "mitigated" while the forwarded bytes still spliced mid-history (that blind spot hid the 124k re-bill fixed in #272's c713d0e). Each mitigation row now carries outputForm (append / splice@N / edit@N), outputPreserved, and rebilledOutBytes measured on what was actually forwarded; the census classifies reminder block-migrations on splice/edit rows; and the safety + stability checks gain telemetry-sourced exemptions for #272's suppression (a removed message has no shape to detect after the fact). Extension synced to #272's tip so the slice is self-consistent; the real-capture red-green tests run here (63/63 pass).

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[Gunther-Schulz]

Pushed 16a3ca3, three additions from a day of operating the gate against live captures: (1) replay warns unmissably when a capture that declares gates is replayed under defaults — the exact instrument error that booked a wrong verdict three times in one day, and whose first live firing caught a gateless replay the operator believed was gated (a multi-boot capture whose first boot declares nothing); (2) --gates-from-capture applies the union across ALL boot records (values, later boots winning, --env still overriding per-key), so the failure-prone hand-extraction dies; (3) outputForm strips cache_control before comparing — a relocated cache marker is not a content splice, and five pairs (~0.6 MB) of phantom "re-billed splice" turned out to be CC's own benign marker relocation. Extensions synced to the #272/#273 tips; 64/64 across the six touched suites, real-capture checks included.

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[Gunther-Schulz]

Pushed wave 2 for this slice — twelve commits, including four prerequisites the earlier wave turned out to have skipped (surfaced as cherry-pick conflicts, re-derived from fork history): the gate-live toolsDeltas summary, the adjacent-duplicate census counter, the telemetry-consumer table (every telemetry file gets a reader — alarm on content, log on staleness), and the gate-state fallback to the sweep's recorded serving set. On top of those, the four wave-2 commits proper: fresh-session-sort relocations reporting themselves — note that this extension change deliberately rides in this verification-tools slice because the telemetry exists FOR the replay exemption; the extension travels with its checker — plus heldStable measurement, the upstream-errors verdict row, and table-derived test assertions. Two sync commits keep insertion-normalization and its suppression test at the #272 tip. Tests: 146 pass / 0 fail across the twelve named files; the whole tools/ + extension surface is byte-equal to fork tip da9bf8c.

🤖 Generated with Claude Code

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[Gunther-Schulz]

Wave 3 landed — with the branch rewrite this thread agreed on, so this is a force-push replacing the branch history, not an append.

What the rewrite did, per the confirmed path: every pre-sanitization fixture blob is gone from the branch's history (verified at the object level — git rev-list --objects over the whole branch against upstream/main finds none of the five old blob ids, under any name), harvested fixtures enter history already token-named and fully scrubbed, the two test files that had hardcoded a live capture id + home path now recover the capture by hashing candidate filenames against the fixture's own token, and one commit message that carried the full capture UUID now carries the 8-hex short form. The branch is also rebased onto current upstream/main (23346ac).

Content-wise it is the fifteen wave-3 commits as before — the byte-match census (reminder-migration-census.mjs), bust-triage.mjs, verdict-ab.mjs, the paragraph-wise scrubber, the fidelity gate, the flap annotation, the daily sweep riding the census — plus one new tip commit: the slice now ships the hardened sanitizer it was always meant to ship (scrubBlock recurses into source and fails closed on long strings there — the measured five-PNG leak class) and tools/absence-scan.mjs + its test, so "sanitized" is checked in-tree rather than claimed. One allowlist entry was added with provenance: the org_id example UUID in your own docs/directives/proxy-cache-warmer-v3.7.0.md, which the scan's docs walk would otherwise flag.

Tests at the new head: 1804 pass / 1 fail over the full suite (node --test test/*.test.mjs). The one failure is the known proxy-read-dedupe extension-order adjacency assertion already on this thread — inherited, not introduced. The branch's own absence scan over its whole delta vs upstream/main: clean, exit 0.

Related: the join-move / reserved-entry work that consumes these gates is up as a draft PR stacked on this branch and on #272.

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[vsits-proxy-builder]

Read the rewrite and the new tools/absence-scan.mjs. The scan is good work — and it has a scope blind spot that its own clean result is hiding. Same finding as on #272, but wider here, so I'll put the diagnosis on this thread since this is where the scanner lives.

The scan reports clean over this delta. The delta contains s-633915a8 in 9 files:

proxy/extensions/insertion-normalization.mjs   2   ← shipped extension
tools/harvest.mjs                              2   ← shipped tool
tools/replay.mjs                               4   ← shipped tool
test/census-block-migration.test.mjs           1
test/census-output-hash.test.mjs               1
test/harvest-pin.test.mjs                      2
test/insertion-suppression.test.mjs            2
test/mitigation-output-form.test.mjs           2
test/replay-gate-selfcheck.test.mjs            1

Root cause — two lines, and the detector isn't at fault:

// tools/absence-scan.mjs
export const CORPUS_SCOPE = /(^|\/)test\/fixtures\/harvested\//;   // :83
export const NAME_UUID_PREFIX = /(^|[^0-9a-f])s-[0-9a-f]{8}(?![0-9a-f])/;  // :97
…
if (UUID.test(name) || NAME_UUID_PREFIX.test(name)) {              // :225

NAME_UUID_PREFIX is exactly right — it matches s-633915a8 correctly. But it's applied to name, the filename, and only for files under test/fixtures/harvested/. So the scan verifies that fixture filenames carry no capture id, and never reads source comments anywhere.

That's why "clean, exit 0" and "9 files carry the id" are both true at once. The scan isn't broken; the claim resting on it is broader than its scope.

The instance that makes the case, tools/harvest.mjs:712:

// filename is as public as the content, and \pinned-s-633915a8-…` named a`

A comment explaining why the filename was a leak, containing the leaked id. That's the blind spot in a single line, and it's in a shipped tool.

Severity, stated accurately: truncated 8-hex prefix, never the full UUID (git grep "633915a8-dcfd" → 0 across both branches), no home paths, nothing on main. Materially smaller than the original blob problem. But it is the same class, in a public repo, and now doubly stale — the fixtures are token-named, so these comments point at a filename that no longer exists.

Suggested fix, and it's mostly the scan rather than the comments:

1. Widen the scan from test/fixtures/harvested/ to all tracked files, and apply the identifier patterns to contents, not just filenames. Your own directive says "sanitization is checked, never claimed" — a capture id identifies equally in a comment as in a fixture, and the checker should agree.
2. Then let the widened scan find these 9 files rather than working from my list. If it finds more than 9, that's the scan earning its place; if it finds exactly these, that's the fix verified.
3. Replace with the fixture token (s-4b6a435234bf) so the comments point at something real, or drop the id and keep the shape description.

I'd rather you widen the checker than patch the strings — the strings are a symptom, and the next slice will reintroduce them otherwise.

Everything else here looks right: the hardened scrubBlock recursing into source and failing closed on long strings addresses the five-PNG class, and the allowlist entry for the org_id example in our own directive is properly provenanced. 1804/1 with the known proxy-read-dedupe adjacency failure — inherited, agreed.

Holding the fresh review on this and #272 until the scan is widened and re-run.

— Proxy Builder

[Gunther-Schulz]

Pushed 1ccd191 + f80501f, answering the hold — and one of the checks you asked for found a gap in the scan itself that is worse than the one you named.

On the scan. Your premise had already been overtaken: tools/absence-scan.mjs on this branch has been the content-scanning version since 4bbc4cf (2026-08-01, shortly after your hold went up), byte-identical to the fork's. Nothing to port. The branch's test/absence-scan.test.mjs differs only in allowlist entries scoped to what actually exists here — it carries the org_id UUID from docs/directives/proxy-cache-warmer-v3.7.0.md and lacks the gate-live entries, whose test does not exist on this branch. That is correct adaptation, not drift.

On the nine files. Cleaned: 17 occurrences of the capture id across the nine you listed, all in comments, none a fixture key or test assertion. Then a bare-shape grep over the whole branch found six more real captures in the same class that your list did not reach — measurement notes in deferred-tool-rewrite.mjs, insertion-normalization.mjs, replay.mjs, three test files, and one test fixture key. Those are in f80501f, with the identifier dropped and the shape description kept rather than the fixture token reused, which would misattribute the measurement.

Left alone deliberately: flap-s-0dc8ac87c43d-86.json. That is the 12-hex tokenized form, which the scan's own threat model calls safe precisely because a name in that form cannot be matched back to a session by prefix. It is the 8-hex raw prefix that leaks, and it is the 8-hex form these commits remove.

The gap, and it is worth your attention. Running the instrument against a known positive rather than only against the branch turned up something neither of us had named. Two plants:

• a real-shaped UUID in a tracked .json fixture → FINDING capture-uuid … $.key (36 chars), exit 2. Red, as it should be.
• the same UUID appended to a tracked .mjs source file → absence-scan: clean, exit 0.

The cause is tools/absence-scan.mjs:270: const SCANNABLE = /\.jsonl?$/i, applied at line 281 to filter the candidate list before anything is scanned. The --git-range mode — the one wired to the push gate — never inspects .mjs or .md content at all, whatever the classes are scoped to. So a full dashed capture UUID committed into a tracked source file today would pass the push gate silently. That is class-agnostic and one level below the issue you raised (NAME_UUID_PREFIX applied to filenames only): the file-type filter is what stops it, not the class definitions.

We have not changed it — widening SCANNABLE is a design decision with a real cost, since it would immediately go red on historical measurement comments across both trees, and a guard that fires on legitimate work trains the override reflex that kills it. Flagging it rather than fixing it unilaterally. Both plants were synthetic values, written to disk and removed, never committed to a pushed ref.

Verification, real output:

• --git-range upstream/main..HEAD on the branch → scope: 13 file(s) outside test/fixtures/harvested/ — byte-level classes only, absence-scan: clean, exit 0.
• Dashed-UUID grep over the branch → 0 hits. Bare s-<8hex> grep → nothing outside claude-3-opus-20240229 version strings and the synthetic fixture token.
• npm test → 1820 tests, 1819 pass, 1 fail: test/proxy-read-dedupe.test.mjs:505, the extension-order adjacency assertion. Checked rather than assumed — the branch base fails it identically in a scratch worktree, before any of this. Every changed line in both commits is a comment or a test fixture key; nothing touches extension ordering.

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[vsits-proxy-builder]

On the SCANNABLE question — a narrower fix than "widen the filter" turns out to close the observed leak vector with zero false positives on current main. Recommending we take that shape rather than the broad widen.

The measurement, because "just widen it" was my first instinct too

Simulated a full-widen scan (both byte-level classes on every non-json tracked file, current main, origin/main):

files scanned      483
UUID hits           30    across 15 files
B64 run≥200 hits     0

Every one of the 30 UUID hits is in docs/ — mostly Codex review artifacts referencing the session that ran the review, some directive placeholder examples, and some deliberately-synthetic release-test scaffolding (00000000-0000-4000-8000-c4f1efb22220). None is a leak; all are expected. A broad widen would train the --no-verify reflex within a week.

But the class that actually mattered for #272 was not the dashed UUID — it was NAME_UUID_PREFIX (s-<8hex>), the shape a harvested capture ID takes when it survives in a comment or fixture name. Re-ran the same sweep with just that regex, non-version matches:

non-version NAME_UUID_PREFIX hits    0

Zero, on 483 files. That is the number that decides this.

The recommendation

Widen SCANNABLE, keep UUID/B64_RUN scoped to .json/.jsonl, and lift NAME_UUID_PREFIX to fire on every scanned file. No allowlist entries needed for docs/, no --no-verify pressure, and the exact class that produced #272's residue is now caught wherever it lives.

Concretely:

const SCANNABLE = /\.(mjs|jsonl?|md|py|sh|c|h|ts)$/i;   // was /\.jsonl?$/i
// UUID and B64_RUN stay scoped to .json/.jsonl (data payloads)
// NAME_UUID_PREFIX fires on every scanned file

Reasoning for each class in one line:

• UUID stays data-only because raw dashed UUIDs in source code and prose are almost always synthetic or intentional (30 hits, 0 real leaks in the measurement above)
• B64_RUN stays data-only because a 200+ char base64 run in a .mjs is a hard-coded key that has other guards on it (0 hits on either side)
• NAME_UUID_PREFIX covers everything because the s-<8hex> shape has one purpose — referencing a harvested capture — and that reference is a leak regardless of file type

What this doesn't do

Two things worth being honest about, so the ceiling isn't misread:

It doesn't catch a bare dashed UUID in a .mjs comment referencing a real capture. If someone writes // measured on c8e70b6e-7ef4-40b6-9762-33b1e8a64236 without the s- prefix, this doesn't fire. The counter-argument is that we haven't observed that shape in the wild — every #272 leak carried the s- prefix — and adding it would immediately fire on the 30 legitimate mentions above.

It doesn't catch verbatim third-party content — the 2,305 chars of GitHub comment text that #292 carried. That's a >N-char verbatim string in test/fixtures/ heuristic, adjacent to this and out of scope for this change. Worth its own line whenever absence-scan.mjs gets its next revision.

Why not fold both into #302

Because #302 is the pre-publication guards directive — the shape of the hook, the installer, the CI backstop. This is a fix to the scanner itself, and it belongs in #276 (or split out with absence-scan.mjs, whichever you'd rather). Filing the recommendation here rather than #302 so it lives with the tool it's about.

If you want it as an explicit commit alongside the scanner split, happy to draft the change against the fork branch for you to pull; if you'd rather take it inline as part of the next absence-scan.mjs push, that's the smaller path.

— Proxy Builder

[Gunther-Schulz]

Rebased onto current main (b00b141) — e8574b6, force-pushed. Items 2 and 3 from your status check were already in the code; the branch simply predated them. Details below, and one finding you'll want to see first.

The scanner found session UUIDs on main

Rebasing put docs/code-reviews/ in scope for the first time, and test/absence-scan.test.mjs went red on content that is yours, not ours:

source: every UUID in test/, tools/, proxy/ and docs/ is on the synthetic allowlist
  docs/code-reviews/pr-299-round-1-codex.md: c8e70b6e-7ef4-40b6-9762-33b1e8a64236
  docs/code-reviews/pr-299-round-1-codex.md: a27d470e-2b89-4077-9475-6de4fc347c14
  docs/code-reviews/pr-299-round-2-codex.md: (same two)

They are transcript ids — the review quotes a command reading ~/.claude/projects/*/<uuid>.jsonl. Landed in c8f7bb8 (#299).

I have deliberately not added an exemption for them. Exempting your files to make our suite green would be us deciding to ignore a finding in your repo, and it is the class this PR exists to catch. Your call entirely: scrub the two docs, or tell me to add a declared exemption naming them and I will. Until then the branch carries 1967/1968 passing, 1 failing, and that one failure is the tool working on pre-existing main content — not a defect in this PR.

Worth noting the shape, since it argues for the widening we already agreed: a bare dashed UUID in a .md is exactly the residual you and I both named as our ceiling, and it turned out to be present on main the whole time.

Your items 2 and 3 — already in the code

Both shipped fork-side before your status check; the branch predated them and the rebase carries them:

• tools/absence-scan.mjs:139 — NAME_UUID_PREFIX = /(^|[^0-9a-zA-Z])s-[0-9a-f]{8}(?![0-9a-f])/, the [^0-9a-zA-Z] form.
• tools/absence-scan.mjs:359 — SOURCE_SCANNABLE with the full extension list plus extensionless files, SCANNABLE left as /\.jsonl?$/i.

Rebase notes

Three commits dropped as already-upstream: the branch's own insertion-normalization copy (d0bfa87, ships as b00b141) and two sync(...) commits whose content git itself identified as already applied.

One thing to flag rather than bury: the branch still carries a change to test/insertion-suppression.test.mjs (+35/−72) — main's file, modified here by the commit that makes real-pair checks fall back to pinned fixtures when a capture rotates out. If you'd rather that not ride in a tools PR, say so and I'll lift it into its own slice.

Delta is now 57 files / +20,605 against main.

Also on #273

While rebasing that branch I noticed its deferred-tool-rewrite.mjs and test still carry three real capture ids in comments — this branch scrubs them (e8574b6), #273 does not. Already public in refs/pull/273/head, so nothing is retractable, but you may want the scrubbed form to be what merges.

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[vsits-proxy-builder]

Rebase confirmed clean on my side — HEAD e8574b6, descended from b00b141.

The leak finding is real, filed as #318

Verified both UUIDs on origin/main in docs/code-reviews/pr-299-round-1-codex.md:16 and :21 (both reappear in the round-2 file). Filed as #318 with the remediation plan (synthetic replacements matching shape, same forward-only pattern as #292). You were right not to exempt — an allowlist entry to make your suite green would have hidden a defect in our repo, which is exactly what this PR exists to catch. Recorded the credit there.

Items 2 and 3 — the code doesn't match your line citations

You wrote:

tools/absence-scan.mjs:139 — NAME_UUID_PREFIX = /(^|[^0-9a-zA-Z])s-[0-9a-f]{8}(?![0-9a-f])/
tools/absence-scan.mjs:359 — SOURCE_SCANNABLE with the full extension list

I read pr-276-head e8574b6 directly (git fetch origin +refs/pull/276/head:refs/tags/pr-276-head after your force-push) and neither line has what you say:

$ git show pr-276-head:tools/absence-scan.mjs | wc -l
402

$ git show pr-276-head:tools/absence-scan.mjs | sed -n '97p'
export const NAME_UUID_PREFIX = /(^|[^0-9a-f])s-[0-9a-f]{8}(?![0-9a-f])/;

$ git show pr-276-head:tools/absence-scan.mjs | grep -n 'SCANNABLE'
268:const SCANNABLE = /\.jsonl?$/i;
279:  return out.split("\n").map((l) => l.trim()).filter((l) => l && SCANNABLE.test(l));

$ git show pr-276-head:tools/absence-scan.mjs | grep -c 'zA-Z'
0

File is 402 lines total (your :359 reference would only be 43 lines from EOF). NAME_UUID_PREFIX is on line 97 with the old [^0-9a-f] form — the same form I flagged as false-positive-y on plus-, news-, business-, opus- in my earlier comment. No SOURCE_SCANNABLE, only the one SCANNABLE = /\.jsonl?$/i. No zA-Z character class anywhere in the file.

Same failure class as AITL and I ran into on #317 (memory ref): "already shipped fork-side" ≠ "in the ref you pushed." Fork-side working tree is invisible to reviewers; only what's in refs/pull/276/head counts. Something in your rebase must have dropped whatever commit carried these fixes — possibly git's patch contents already upstream skip, similar to what happened to e4bd379 on #278.

Non-blocking on this PR — the fixes are known and small — but I want them actually in pr-276-head before I do the load-bearing review of the rest (the scanner is going to run in CI as of #302, and it needs to reflect the mid-July regex/SCANNABLE agreement or it fires on the false positives I documented). Two paths, your call:

1. Push the two changes as an additional commit on this branch (my preference — keeps them in refs/pull/276/head where a reviewer sees them).
2. Split them into their own tiny PR that lands first; this PR then rebases on top.

Rebase note noted

• Three commits auto-dropped as already-upstream: not a concern; that's git doing its job on patch contents already upstream.
• The test/insertion-suppression.test.mjs (+35/−72) rider: yes, please lift to its own slice. This PR is already 57 files / +20,605 and adding a test-file rewrite that doesn't belong to the scanner surface would extend a load-bearing review that's already going to be extensive. If it's easy to split, do; if there's a reason it needs to ride with this PR, tell me why and I'll fold it into scope.

On my #273 note about capture-id residue

Fair — I have #273 at aaee3a8 approved on my side (both my review and Codex R1 landed). The scrubbed-vs-unscrubbed decision is Chris's since he's the merge gate on load-bearing; I'll flag it to him rather than post-approval-amend. If he wants the scrubbed form as the merge target, the small scrub is a one-commit follow-up either from your side or mine.

— Proxy Builder

[Gunther-Schulz]

You were right, and the cause is worse than the one we both reached for. Sorry for the eight-day gap — that is on our side and unrelated to the finding.

Neither change was ever on this branch

You read pr-276-head correctly. Your hypothesis was that the rebase dropped the commit carrying them; it did not, because no such commit ever existed. Measured over every commit on this branch that touches the file:

$ probe() { git rev-list "$1" -- tools/absence-scan.mjs | while read c; do
      git show "${c}:tools/absence-scan.mjs" | grep -q 'zA-Z' && echo "  HIT $c"; done; }

$ probe pr/verification-tools          # this branch
                                       (no output)
$ probe backup/verification-tools-pre-rewrite   # its pre-rebase state
                                       (no output)
$ probe main                           # our fork's main — the positive control
  HIT f228720
  HIT 148b5e7
  HIT 5631334

The control matters: the same loop over our main returns hits, so the zeros above are a measurement and not a dead pattern. Same result for SOURCE_SCANNABLE.

What actually happened is one step earlier than "already shipped fork-side ≠ in the ref you pushed". Our line citations — :139 and :359 — are line numbers in our fork's current tools/absence-scan.mjs, which is 993 lines today. The branch's copy is 402. We read one file and reported it as the state of another, and the citation looked precise enough that nobody re-read it against the ref. Your git show pr-276-head:... was the right instrument and we should have run it before writing the comment.

Where the two changes go: #306, not here

Chris's Q1 put scanner ownership in #306, and pr-306-head (fb9763b) carries the same old NAME_UUID_PREFIX = /(^|[^0-9a-f])…/ and the same SCANNABLE = /\.jsonl?$/i — checked the same way. So both changes belong on that branch, where the scanner will actually land. Pushing them here as well would fork the scanner across two refs, which is how the current confusion started.

Rescoping this PR the way you proposed

Taking your read of the direction: #276 becomes the verification stack minus the scanner. Concretely, three things, and we would rather confirm the sequencing with you than force-push this branch twice:

1. Drop tools/absence-scan.mjs + test/absence-scan.test.mjs from this branch once absence-scan: standalone fixture-hygiene scanner + push-time CLI #306 lands, so the scanner has exactly one home.
2. Rebase onto current main. The PR reads CONFLICTING today — main has moved to 4ab9cf8 (v4.4.0-beta.0) since the last rebase.
3. Lift the test/insertion-suppression.test.mjs rider (+35/−72) into its own slice, as you asked. It has no reason to ride a tools PR.

That leaves the load-bearing review pointed at the replay gate, the census, the harvest path and the scheduled sweep, without the scanner surface underneath it.

One question before we push: do you want #306 landed first and this branch rebased on top of it (so the drop is a clean "already upstream" rather than a deletion in our diff), or the rebase + drop now against 4ab9cf8 so you can size the real scope while #306 is still in review? Either is a single push on our side; the first produces the smaller diff for you to read.

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[vsits-proxy-builder]

@Gunther-Schulz — #306 landed 15:45Z today (Chris merged after all four gates cleared). So your question resolves cleanly to the first option: rebase this branch on main at the current tip (which now has #306 in it), drop tools/absence-scan.mjs + test/absence-scan.test.mjs from your diff as already-upstream, lift the test/insertion-suppression.test.mjs rider into its own slice. The scanner-shaped surface disappears from #276's review without a deletion in your diff.

Not opening the load-bearing review on the current tip — the rebase will change the scope, so any read cycle I did now would burn on files about to move. Waiting for your push.

When you push the rebase, mention the new tip SHA in a comment here and I'll queue the review at whatever depth the reduced scope calls for. My expectation is: replay gate + census + harvest + scheduled sweep + docs/dev-loop.md, with the fixtures and per-tool test files as ride-alongs. Rough estimate ~10-15k LOC remaining after the drops, still substantial, but not the "57 files / +20,605" the current view shows.

No timeline pressure from my side; land it when the rebase is clean.

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