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Wrap-up: Phase 3a — split the watch predicate from the merge gate#24

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Jul 25, 2026
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Wrap-up: Phase 3a — split the watch predicate from the merge gate#24
topij merged 4 commits into
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chore/update-handoff-2026-07-25

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@topij topij commented Jul 25, 2026

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Session wrap-up for 2026-07-25 (second session).

Not docs-only. Alongside the narrative files this fixes a stale comment on the merge gate in scripts/dev_session.sh (with kit-manifest.json rehashed) and broadens one test. See "Found in review" below.

Handoff

Records Phase 3a and the two corrections the design took:

  • The Phase 3 sequencing decision — and why the proposed flag-based order was replaced. The flag existed to defer a breakage caused by done conflating two predicates; splitting them removed the need for it.
  • Split the watch-loop predicate from the merge gate (additively) #22 merged: converged / mergeable split, done kept as an unchanged alias. Tests 196 → 202.
  • The first cut failed open. My own adversarial re-read caught that, not CodeRabbit — its pass on that commit raised a local-declaration nit and a test nitpick.

Also resolves the previous session block's ▶ Next:, which still described the superseded ordering, and defines the "Phase 3 / cs-toolkit back-port" vocabulary that previously existed nowhere outside this file — making the design's stated justification unverifiable from this repo.

Friction

Two entries at H, both with proposed fixes. They are issue-shaped and flagged in the handoff as unfiled — triage-friction-log should graduate them:

Found in review

This PR was reviewed by the panel mechanism it proposes — two cold-context subagents, one correctness-lensed, one adversarial. They overlapped on nothing.

The correctness lens found that scripts/dev_session.sh still described the rejected first design at the merge gate: "done is the watch-loop predicate … deliberately true on a PR that carries no review receipt". In the merged code done is an alias of mergeable, so that was false and the next clause circular. It shipped to main in #22 and three of my own passes read past it. Fixed here.

The adversarial lens then found nine issues in the wrap-up itself, including:

  • This PR body asserting the fallback "met the doctrine's floor" — the framing the diff had already retracted. Rewritten above.
  • The handoff claiming the alias equivalence was "pinned across the whole boolean input space", when the exhaustive test covers decide_done — the function with no in-engine caller — while the report key that actually provides the protection was pinned by four examples. Same function-vs-key confusion the session lists as a finding. Corrected, and the key's test broadened to a 24-case matrix.
  • "was rejected in review" reading as though an independent reviewer caught the fail-open.
  • A ▶ Next: sigil used to mark a superseded item — session-start reads every Next: trail, so that would surface a resolved item as actionable. Now ✔ Superseded.
  • A third quote-vs-restate slip (paraphrasing /upgrade in a way that inverted its verb), in a session whose own recorded lesson is that a doc quoting a contract must quote it.

For the operator

Two things wrap-up.md asks me not to do unilaterally, flagged rather than assumed:

  1. I edited the previous session block's closing line (to kill a relative "session above" reference that breaks once archive_plan_sessions.py demotes the block). The workflow authorizes a ▶ Next: line on the latest block only.
  2. I added a block-quote glossary defining "Phase 3" at the top of the new session block — a new structural element.

Both are revertable if you'd rather they weren't there.

Budgets at HEAD: handoff 182/400, friction log 67/150 — no archive sweep needed. 202 tests pass.

Summary by CodeRabbit

  • Documentation

    • Expanded session handoff notes with updated Phase 3a status, merge checks, follow-up decisions, and next steps.
    • Added guidance on independent fallback reviews and ensuring review records match the final change set.
    • Clarified how merge readiness is determined and documented related safety considerations.
  • Reliability

    • Improved validation coverage across review receipts, merge states, status checks, and pull request conditions.

…erge gate

Records the sequencing decision and the two corrections it took, resolves the
previous block's now-superseded `Next:` (it proposed a flag whose purpose
disappeared once the predicates were split), and adds two friction entries about
the fallback review pass standing in for a rate-limited primary reviewer.

Claude-Session: https://claude.ai/code/session_01V27wAgECMEApqAvmJMFyqm
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Review profile: CHILL

Plan: Pro Plus

Run ID: 3ce42ddf-6ec5-4596-ada9-c140869cdc91

📥 Commits

Reviewing files that changed from the base of the PR and between c503f4e and 09a327c.

📒 Files selected for processing (5)
  • config/dev-model.yaml
  • docs/kit-friction-log.md
  • docs/kit-handoff.md
  • kit-manifest.json
  • scripts/dev_session.sh
📝 Walkthrough

Walkthrough

The PR documents review receipt failure modes and Phase 3a handoff decisions, clarifies merge-gate semantics, expands predicate-alias test coverage, and updates the script checksum in the manifest.

Changes

Review gate updates

Layer / File(s) Summary
Review incidents and Phase 3a handoff
docs/kit-friction-log.md, docs/kit-handoff.md
Adds review receipt failure-mode entries and records Phase 3a predicate separation, sequencing changes, and follow-up notes.
Merge-gate semantics and validation
scripts/dev_session.sh, scripts/tests/test_pr_watch.py
Clarifies that merge gating uses convergence and receipt binding, and tests done/mergeable identity across expanded report and receipt combinations.
Script checksum synchronization
kit-manifest.json
Updates the recorded checksum for scripts/dev_session.sh.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related issues

Possibly related PRs

  • topij/agentic-dev-kit#3: Introduces closely related pr_watch review-receipt and merge-state logic covered by the expanded tests.
  • topij/agentic-dev-kit#22: Contains the related done versus mergeable refactor and merged-gating semantics.
🚥 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 summarizes the main change: Phase 3a wrap-up and splitting the watch predicate from the merge gate.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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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  • Create PR with unit tests
  • Commit unit tests in branch chore/update-handoff-2026-07-25

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Findings from a cold-context subagent review of #24 — the mechanism proposed in
this PR's own friction entry, tried on this PR.

- `dev_session.sh` still described the REJECTED first design at the merge gate:
  "`done` is the watch-loop predicate ... deliberately true on a PR that carries
  no review receipt". In the merged code `done` is an unchanged alias of
  `mergeable`, so that is false and the following sentence is circular. The
  Python docstrings were updated during the rework; this bash comment was not.
  The session's headline lesson is "documentation does not reach a stale
  reader" — and it shipped one inside the gate it was written about.

- The handoff and friction log described self-review as satisfying "the
  doctrine's floor". There is no such floor: rule 2 says a single-lens verdict
  is "not a green light", and rule 3 wants re-review to convergence, which the
  fallback's same-pass approve did not meet. Recorded as a rule violation.

- Both friction entries now carry a proposed fix, per wrap-up.md; a misquote of
  safety-critical-changes.md is corrected (the repo's own lesson is that a doc
  quoting a contract must quote it, not restate it); the "Phase 3" vocabulary is
  defined so its justification is checkable from this repo; and the superseded
  `Next:` marker no longer uses a relative reference that breaks once
  archive_plan_sessions.py demotes the block.

Also requested a CodeRabbit pass over #22's merged design — the one concrete
action #22 generated, which was recorded only in a PR comment.

Claude-Session: https://claude.ai/code/session_01V27wAgECMEApqAvmJMFyqm
Second lens (adversarial, cold context) over #24's own diff. It confirmed the
rewritten merge-gate comment is accurate, then found nine issues in the wrap-up.
Addressed:

- The PR description still said the fallback "met the doctrine's floor" — the
  exact framing the previous commit retracted from both files. Rewritten, along
  with two other false body claims ("docs-only"; stale budget numbers).
- The handoff claimed the alias equivalence is "pinned across the whole boolean
  input space". The exhaustive test covers `decide_done` — the function with no
  in-engine caller — while the report KEY that provides the protection was
  pinned by four examples. That is the same function-vs-key confusion listed two
  bullets later as a finding. Claim corrected; the key's test broadened from 4
  cases to a 24-case matrix over converged/blocked/receipt state.
- "was rejected in review" read as though an independent reviewer caught the
  fail-open. It was my own adversarial re-read; CodeRabbit's pass on that commit
  raised a `local` nit and a test nitpick. Attributed.
- The outstanding CodeRabbit review of #22's merged design lived only in a PR
  comment. Now an explicit open item in the handoff, with the unfiled H-severity
  friction entries.
- `▶ Next:` was used to mark a SUPERSEDED item; `session-start` reads every
  `Next:` trail, so that surfaces a resolved item as actionable. Now `✔`.
- A third quote-vs-restate slip: the `/upgrade` paraphrase inverted its verb.
- `dev_session.sh` gave naming clarity as the reason to read `mergeable`. The
  real reason is that it is absent from any pre-split engine, so a version skew
  fails closed — a safety property, not a style preference.
- Friction entry's "severity raised from M" had no referent, and cited this PR's
  own review as corroboration without saying so. Both stated plainly.

Claude-Session: https://claude.ai/code/session_01V27wAgECMEApqAvmJMFyqm

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/kit-friction-log.md`:
- Around line 36-46: Update the safety-critical PR heading in
docs/kit-friction-log.md to say “without any independent review” instead of
claiming there was no review of the final design. Preserve the surrounding
explanation that the fallback reviewed the current head and satisfied the
receipt while the primary review was stale.
🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

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Review profile: CHILL

Plan: Pro Plus

Run ID: 116c7898-2f79-4816-b698-e984751c478a

📥 Commits

Reviewing files that changed from the base of the PR and between 49f6793 and c503f4e.

📒 Files selected for processing (5)
  • docs/kit-friction-log.md
  • docs/kit-handoff.md
  • kit-manifest.json
  • scripts/dev_session.sh
  • scripts/tests/test_pr_watch.py
🚧 Files skipped from review as they are similar to previous changes (1)
  • docs/kit-handoff.md

Comment thread docs/kit-friction-log.md
Comment on lines +36 to +46
- **A safety-critical PR merged without any review of its final design (severity: H).**
Also #22: CodeRabbit's only completed review was bound to the first commit; the design then
changed materially (the fail-open rework), and the rate limit never lifted. The receipt
mechanism records *that a review happened at this head* — satisfied by the fallback — with
no notion of "the primary reviewer saw an earlier, materially different design."
**Proposed fix:** invalidate a receipt when the diff changes *shape* rather than only when
the head moves — e.g. require a fresh receipt when a later push touches a file the recorded
review never saw. Cheaper interim: have `pr_watch` surface the primary bot's last-reviewed
SHA next to the current head, so the gap is visible at merge time instead of reconstructible
only from the PR thread. Related to #23 but distinct: #23 is about detecting the outage,
this is about what a receipt should mean when the outage outlasts a redesign.

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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Say “without any independent review” here.

The heading says no review covered the final design, but the entry states that the fallback reviewed the current head and satisfied the receipt. The actual gap was the absence of an independent/primary review, so the current wording overstates the incident.

Proposed wording
-- **A safety-critical PR merged without any review of its final design (severity: H).**
+- **A safety-critical PR merged without any independent review of its final design (severity: H).**
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
- **A safety-critical PR merged without any review of its final design (severity: H).**
Also #22: CodeRabbit's only completed review was bound to the first commit; the design then
changed materially (the fail-open rework), and the rate limit never lifted. The receipt
mechanism records *that a review happened at this head* — satisfied by the fallback — with
no notion of "the primary reviewer saw an earlier, materially different design."
**Proposed fix:** invalidate a receipt when the diff changes *shape* rather than only when
the head moves — e.g. require a fresh receipt when a later push touches a file the recorded
review never saw. Cheaper interim: have `pr_watch` surface the primary bot's last-reviewed
SHA next to the current head, so the gap is visible at merge time instead of reconstructible
only from the PR thread. Related to #23 but distinct: #23 is about detecting the outage,
this is about what a receipt should mean when the outage outlasts a redesign.
- **A safety-critical PR merged without any independent review of its final design (severity: H).**
Also `#22`: CodeRabbit's only completed review was bound to the first commit; the design then
changed materially (the fail-open rework), and the rate limit never lifted. The receipt
mechanism records *that a review happened at this head* — satisfied by the fallback — with
no notion of "the primary reviewer saw an earlier, materially different design."
**Proposed fix:** invalidate a receipt when the diff changes *shape* rather than only when
the head moves — e.g. require a fresh receipt when a later push touches a file the recorded
review never saw. Cheaper interim: have `pr_watch` surface the primary bot's last-reviewed
SHA next to the current head, so the gap is visible at merge time instead of reconstructible
only from the PR thread. Related to `#23` but distinct: `#23` is about detecting the outage,
this is about what a receipt should mean when the outage outlasts a redesign.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@docs/kit-friction-log.md` around lines 36 - 46, Update the safety-critical PR
heading in docs/kit-friction-log.md to say “without any independent review”
instead of claiming there was no review of the final design. Preserve the
surrounding explanation that the fallback reviewed the current head and
satisfied the receipt while the primary review was stale.

…and stale config vocabulary

Round-3 convergence pass (cold context, regression-focused) plus CodeRabbit's
review of the current head — which agreed on the first item.

- **I overstated my own failure.** Both files said the final commit of #22 was
  "reviewed by nothing". The fallback pass did see `32f3e4f` (it posted seconds
  after that commit, naming it); what never happened is an INDEPENDENT review,
  and a rule-3 re-review after the fixes. Accuracy cuts both ways — an
  overstated violation is still an inaccurate handoff.

- **The previous round's fix to `dev_session.sh` overshot.** It claimed `done`
  is a key "an older engine might carry with different semantics". Every
  pre-split kit `pr_watch` emitted `done` with exactly this merge-authorization
  meaning — that is this PR's own thesis — so both keys are safe against a kit
  version skew. Rewritten to state the real reason: `mergeable` is the precise
  name, `done` the one retained for compatibility. This is the pattern rule 3
  exists for: my fix made an accurate comment inaccurate.

- `kit-handoff.md` pointed at friction entries "below" that live in a different
  file — added by the same commit that removed a relative reference elsewhere.

- `config/dev-model.yaml` still described `unavailable_markers` and
  `informational_checks` in terms of `done`. Post-split the load-bearing
  property is that informational checks never block `converged` (the anti-wedge
  property). Commit 74da7c8 claimed to have swept every stale reference; it had
  not.

Claude-Session: https://claude.ai/code/session_01V27wAgECMEApqAvmJMFyqm
@topij

topij commented Jul 25, 2026

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Fixed in the latest push — and you were right, which is worth stating plainly since it corrects an error in my direction rather than the usual one.

docs/kit-friction-log.md and docs/kit-handoff.md both said the final commit of #22 was "reviewed by nothing." That overstates. The fallback pass posted 17 seconds after 32f3e4f, naming that commit — so it did cover the final code. What never happened is an independent review, and a rule-3 re-review after the fixes. Both files now say that instead.

Two notes for the record:

  1. An overstated self-criticism is still an inaccurate handoff. The whole point of that document is that a future session can trust it; "no review happened" would have sent someone looking for a gap that isn't the real one. The real gap is narrower and more specific — no independent pass — and that is the one worth fixing.

  2. This is the first review you've given this PR that landed on the current head; your earlier pass on Split the watch-loop predicate from the merge gate (additively) #22 was bound to its first commit and the design changed materially afterwards. Your rate limit lifting in time to catch this is the reason the correction exists. There is a filed issue (pr_watch cannot see reviewer unavailability reported as a status-check description #23) about pr_watch being unable to reliably detect when you're unavailable — this PR's friction log carries the related one about what a review receipt should mean when the outage outlasts a redesign.

Also fixed this round, from a cold-context review pass: a regression my own previous fix introduced into the cmd_merge comment (it claimed an older pr_watch might carry done with different semantics — untrue, every pre-split engine emitted it with exactly the current merge-authorization meaning), a cross-file reference that said "below", and stale pre-split vocabulary in config/dev-model.yaml that an earlier commit had claimed to have swept.

@topij
topij merged commit f0f41cf into main Jul 25, 2026
3 checks passed
@topij
topij deleted the chore/update-handoff-2026-07-25 branch July 25, 2026 11:15
topij added a commit that referenced this pull request Jul 25, 2026
…) (#25)

* Resolve queued-vs-unavailable on both surfaces (#19 + #23)

Two issues, one predicate. A configured review bot's status check is excluded
from the blocking tally so a bot that never reports cannot wedge the watch loop
— but that exclusion made an *unavailable* bot indistinguishable from one that
reviewed and found nothing (#23), and a merely *queued* bot indistinguishable
from a finished one (#19). Neither could be fixed by letting that check block,
because the exclusion is the anti-wedge property.

The way out is that nothing here touches `decide_converged`. The anti-wedge
property lives entirely in that predicate and is left alone; every new signal
feeds the merge gate, which already requires someone to explicitly record a
review receipt. So the gate can wait longer, but the poll/fix/ack loop can
always finish.

`summarize_review_bots` resolves each `review.bots` entry to:

- unavailable — an `unavailable_markers` hit on a comment body OR on the bot's
  status-check DESCRIPTION (#23; `gh pr view --json statusCheckRollup` carries
  no description at all, hence the second `gh pr checks` fetch). Never blocks;
  it is the action signal to run the fallback, and it survives `--mark-seen` so
  the gap stays readable at merge time. It also cancels the pending block below
  — a bot that announced it is not reviewing will never leave pending.
- pending — the bot's check is non-terminal and no outage was announced. Blocks
  `mergeable` and makes `--record-review` refuse (#19: on #16 a receipt was
  taken against a queued CodeRabbit and four valid findings landed post-merge),
  until it ages past `review.bot_pending_grace_minutes` (default 15) — the bound
  that keeps a dead bot from wedging the gate.

Also here because the fix does not work without them:

- `"review rate limited"` added to `unavailable_markers`. The mechanism alone
  detects nothing: on #22 the check description used that wording while #24's
  comment said "review limit reached", an hour apart from the same bot.
- kitconfig now parses decimal scalars, gated on a literal `.` so `nan`/`inf`/
  `1e5` stay strings as PyYAML resolves them. Without it a `2.5` grace silently
  fell back to the default.
- `_load_review_config` returns a NamedTuple; the shape grew, and positional
  unpacking makes every future growth a breaking change for every reader.
- `safety-critical-changes.md` now matches `pr_watch.py`. It computes the gate
  `dev_session.sh` merely re-checks, and was matching only the latter.

Blockers are strictly additive: `done` (the legacy alias an older
`dev_session.sh` reads) can only go true→false, so per-file engine skew makes
merges wait, never fire early. Tests 204 → 217.

Closes #19
Closes #23

Claude-Session: https://claude.ai/code/session_011KVJzDj7Z2nYkUjqbGgSVp

* Give the grace clock a source that actually exists

Found by running the first cut against this PR: CodeRabbit's pending status
context reports `startedAt: 0001-01-01T00:00:00Z` — the zero time, i.e. no
timestamp. So the age fallback ("unmeasurable ⇒ fail open, don't block") was not
an edge case at all: it was the *only* path CodeRabbit ever took, and the #19
guard printed "age unmeasurable, NOT blocking" against a live review-in-progress.
The guard was dead code for the one bot it was written for.

The clock now falls back to when this engine first saw the bot pending,
persisted per PR. Because it is our clock and only ever advances, every pending
bot reaches the grace bound — so the fail-open branch is gone entirely rather
than merely narrowed, and there is no unmeasurable case left to wedge on.

Stored as `bot_pending_since: {"head": sha, "bots": {bot: iso}}` — self-
describing rather than scoped by the sibling `state["head"]`. That field is the
false-settle guard's input; making `record_review` maintain it just to scope
this clock would put two intents on one key, and that key decides whether a
just-pushed commit may settle.

`record_review` persists the first sighting BEFORE refusing. Without it a cold
`--record-review` restarts the clock at zero on every retry, so the refusal
could never expire and the override would be the only way through — a wedge
dressed as a guard.

Verified live on this PR: the merge gate now reports
`review bot coderabbit has not reported yet (check CodeRabbit pending 0.0m
< 15m grace)`. Tests 217 → 221.

Claude-Session: https://claude.ai/code/session_011KVJzDj7Z2nYkUjqbGgSVp

* Address CodeRabbit's findings on 233fdd0

All four valid, including one real bug in my own migration.

**init.sh corrupted an inline `unavailable_markers` list.** The awk insert
anchored on `^  unavailable_markers:`, which also matches an inline flow list
(`unavailable_markers: ["a", "b"]`) — equally valid YAML and equally supported
by kitconfig. It then appended a `    - ` line under a key that already has a
scalar value, producing a malformed mapping, and wrote it straight over the
adopter's config. Now only a bare block-list key is migrated; an inline list
falls through to the existing by-hand warning. Verified against both shapes.

**`fetch_check_details` degraded silently.** Both new guards depend on that
fetch, so an older `gh` rejecting one of the requested `--json` fields would
disable #19's and #23's detection with no trace — "checked and clean"
indistinguishable from "never checked", the failure mode that cost this repo
three silent-no-op bugs in one session. It now warns on stderr, once per process
rather than per poll (a warning repeated every round of a watch loop is skimmed
past exactly like silence).

**The PyYAML parity claim is now checked, not restated.** The float-gating
docstring argued "PyYAML resolves these as strings" while asserting only the
expected values — which would pass just as happily if the reference resolver
disagreed with every one of them. Compared against `yaml.safe_load` directly.

**`.tmp.$$`** for the migration temp file, matching `append_to_section`.

Tests 221 → 222.

Claude-Session: https://claude.ai/code/session_011KVJzDj7Z2nYkUjqbGgSVp

* Address the dual-lens review: three real defects, all in the new code

Two fresh-context passes over the diff (adversarial + general-correctness) found
almost disjoint sets, which is the doctrine's claim about why a gate needs both.

**A stale outage comment permanently cancelled the pending block — #19 walking
back in through the door built to close it.** `collect_comments` returns the
whole PR history, unscoped by head or age, so one transient rate limit on commit
1 put the bot in `unavailable_bots` for the rest of the PR and waved through
every later queued review. Rate limits are transient by construction, which
makes "this bot was rate-limited earlier" the ORDINARY state of a later poll,
not a corner case. Now only a CHECK-surface outage cancels: a check describes
the bot's state now, a comment describes the past. Comment outages are still
reported — that is #23's action signal — they just cannot speak for the present.

**A corrupt or foreign `bot_pending_since` value wedged the merge gate forever.**
`age = parse(stored) or 0.0` pinned an unparseable value at the maximally-
blocking age *and* wrote it back, so every later poll re-read the same poison.
Reachable from a corrupt state file, an older engine, or a richer future format.
Anything unreadable is now replaced rather than coerced, so the window stays
bounded whatever wrote the state.

**The init.sh migration silently orphaned every existing marker on a 2-space
block list.** The guard checked the key line's indent while the awk anchored on
4-space items, so a config formatted with dashes at the key's own indent (what
several YAML formatters emit, and what kitconfig explicitly supports) got the
new marker inserted at the wrong depth — dropping all the originals, while the
post-condition grep still passed and `mv`'d it over the adopter's config. That
is fail-OPEN on the very markers this PR exists to extend. Now indent-aware,
verified against 4-space, 2-space and inline shapes.

Also: `review_bots.signal` makes a failed check-read machine-readable (the merge
gate consumes stdout; a stderr warning is not a guard on an autonomous path);
the override is recorded on the receipt; comment authors match anchored rather
than by substring (that input is attacker-controlled on a public repo, check
names are not); the grace bound compares the exact age, not the rounded display
value; `render` no longer claims "past the grace" for a check cancelled by an
outage; kitconfig's float rule is YAML 1.1's own (signed exponent required) with
its three remaining divergences pinned as divergences; and init.sh's idempotency
grep is scoped to the marker block so it cannot silently skip both the migration
and its warning.

Tests 222 → 229.

Claude-Session: https://claude.ai/code/session_011KVJzDj7Z2nYkUjqbGgSVp

* Fix the regressions the fix round introduced (re-review #2)

The doctrine's "re-review after every fix round, not one pass" earning its keep:
a third fresh-context pass found that two of the three fixes were incomplete and
that the round introduced a new data-loss path.

**`record_review` computed the bot signal and threw it away.** When the check
read fails there are no blockers to raise, so the receipt was taken with the #19
guard simply switched off — and unlike the explicit override, which the same
round had just made auditable, this left no trace at all. The commit message
even justified `signal` as machine-readable evidence while no consumer read it.
Now recorded on the receipt as `bot_signal`, surfaced by the renderer. Still not
a refusal: an old `gh`, or a PR with no checks, is an environment problem, and
refusing would turn it into a wedge whose only exit is the override flag.

**The poison-clock fix missed the parseable half.** A *future-dated*
`bot_pending_since` survives `_age_minutes`, gets clamped to age 0 by
`max(0.0, …)`, and is re-persisted verbatim — so the block lasts until real time
catches up with the stamp. Measured at 30 days on a copied state file. Anything
beyond a small skew tolerance is now treated as unusable and restamped, so the
window is bounded whatever wrote it. The previous test only covered unparseable
values, which is why this survived.

**The new `review.bots` migration lost adopter values.** `grep -q '^  bots:'`
misses a 4-space-indented `review:` block and then appends a duplicate at 2
spaces, which the reader resolves last-key-wins — silently dropping a
`[bugbot, coderabbit]` down to `[coderabbit]`. It also reported success when it
had written nothing, and was satisfied by an unrelated `bots:` under any other
section.

**The marker migration still no-opped silently, and could write to the wrong
section.** Scoping the *idempotency grep* to the block left the outer key anchor
whole-file, so: a tab- or 4-space-indented key skipped both migration and
warning; a same-named list under an earlier section got the marker while the
success message claimed `review.unavailable_markers` had it; a comment or blank
line mid-list truncated the idempotency view and re-inserted a marker already
present; and a file with no trailing newline failed the `wc -l` post-condition.

Both migrations now go through `section_range` / `section_lines`, which bound
every read and write to the `review:` section at any indent. Every whole-file
`grep '^  key:'` in a migration is a latent bug in two directions at once — it
misses the key at another indent and matches a same-named key elsewhere — and
this change had shipped one of each.

Also: kitconfig's float pattern is now transcribed from PyYAML's resolver rather
than approximated. Hoisting the sign out of the alternation diverged on `+.5`,
`-.5` and `-.5e+3` — the exact "float() is too loose" class the previous commit
claimed to have eliminated. Parity verified over 24 forms; the two remaining
gaps (`.inf`/`.nan`, sexagesimal) are pinned as gaps. Plus the blocker string no
longer reads `pending 15.0m < 15m grace`, and three docs describing anchored
author matching as substring are corrected.

Migrations verified against seven real config shapes (4-space, 2-space, inline
flow, comment-mid-list, empty list, no-trailing-newline, same-named key under
another section), each round-tripped through the real kitconfig.

Tests 229 → 231.

Claude-Session: https://claude.ai/code/session_011KVJzDj7Z2nYkUjqbGgSVp

* Stop doing surgery on adopters' config, and test what's left (re-review #3)

Third pass. It found that 8a1d5df applied its own section-scoping fix to ONE of
three guards in the same function, that the marker insertion had a third
corruption mode, and that the highest-blast-radius code in the diff had no tests
at all. All three are the same underlying mistake: shell text-munging on a file
the adopter owns, defended one special case at a time.

**The marker migration is gone.** Three review rounds produced three distinct
ways for list surgery to corrupt a config — wrong indent orphaned every existing
entry; a whole-file key anchor wrote into a same-named list under another
section; and inserting before "the first line that is not an item" splices a
multi-line item in half, yielding YAML PyYAML refuses to load *entirely*. Each
passed the migration's own post-conditions and printed success. The payoff was
one string in a list. `init.sh` now detects the gap and prints exactly what to
add — a trade that stops being worth defending after the third corruption.

**Guards are section-scoped everywhere now, not in one place.** A whole-file
`grep '^  key:'` fails in two directions at once: it misses the key when the
adopter's section uses another indent, and it is satisfied by a same-named key
elsewhere. `migrate_kit_schema` had one of each; `migrate_runtime_schema` still
had three more, which is why a 4-space config was non-idempotent — every run
re-appended `fallback_commands`.

**Per-key review migration.** One `noise_markers` guard used to gate a block
defining five keys, so an adopter with `unavailable_markers` but no
`noise_markers` got a second definition of it — and both readers resolve
last-key-wins, silently replacing their list with the kit's defaults.

**`append_to_section` re-indents to the section it is writing into.** Appending
a 2-space block to a 4-space section produced a mapping with two indent levels:
PyYAML fails on the WHOLE file, kitconfig tolerates it and applies
last-key-wins. Note what did NOT ship: making this function return non-zero on
"section not found" seemed like the obvious way to stop callers reporting false
success — under `set -eu`, with callers that don't test its status, it aborted
init.sh on the first config missing any optional section. Caught by running it.

**Engine fixes.** The observed clock now wins over a check's own stamp whenever
we have one: preferring the check let the age REGRESS when a future-dated stamp
slid inside the skew tolerance, restarting a window that had already expired and
making merge_blockers non-monotonic in wall-clock time. And `bot_signal` is
recorded only for `unavailable`, not for `skipped` — "you configured no bots"
was being reported as "the guard did not run", putting a permanent false warning
on every receipt a bot-less adopter takes.

**Tests, finally.** Eight config shapes (2-space, 4-space, flush-indent, inline
flow, decoy section, header with trailing space, multi-line item, no trailing
newline) × corruption, idempotency, exactly-once, and the instruct-when-it-can't
path. Every corruption above fails at least one. The kitconfig-vs-PyYAML
disagreement on multi-line scalars is asserted as a known reader limitation
rather than skipped, so closing it later fails loudly.

Verified the shipped config is unchanged relative to main (both reformat the
same 5 comment-alignment lines via the pre-existing set_field).

Tests 231 → 249.

Claude-Session: https://claude.ai/code/session_011KVJzDj7Z2nYkUjqbGgSVp

* Address CodeRabbit's review of the current head

Its first pass covered `233fdd0`; this is its first look at the actual design,
after the grace clock and three rounds of fallback-panel fixes. All three
findings valid.

**The "ACTION NEEDED" message walked inline-list adopters into the corruption
it replaced.** Dropping the list surgery left an instruction that always prints
`- "review rate limited"` — a block item. An adopter whose `unavailable_markers`
is a flow list (`["a", "b"]`) who follows that literally hangs a block item off
a flow scalar and breaks their config. The step is read-only, so it could not
corrupt anything itself; it would just have talked someone else into doing it.
Now detects the style and says "add the string inside the brackets" instead.

**`zip(pending, exact_ages, strict=True)`** — the lists are appended in lockstep,
so a later edit adding a `continue` between them would pair each entry with the
wrong age, silently, and only for a bot with more than one pending check.

**The no-PyYAML type test covered 3 of 21 tokens**, which inverts the invariant
its own neighbour states ("kept as one list so the parity check cannot quietly
cover a smaller set"). The parity test skips precisely where the engines run —
a bare env with no PyYAML — so those three were the only coverage that
environment had. Now parametrized over the full set with a declared expected
type, plus a guard that the two sets stay equal, so adding a token cannot leave
it untested where it matters most.

Tests 249 → 270.

Claude-Session: https://claude.ai/code/session_011KVJzDj7Z2nYkUjqbGgSVp

* Cover the branch a mutation proved was dead-codeable (re-review #4)

**The style-detection branch had no test, proven by mutation.** Hardwiring the
condition to a constant — so inline-list adopters get the corrupting `- ` advice
— still passed the whole suite. The only assertion checked the block direction.
Sharpest part: `_MIGRATION_SHAPES` already contained an `inline_flow` fixture and
the commit message advertised the path as covered; the fixture was there, the
assertion was never written. Now parametrized per style, and the same mutation
fails.

**Style detection missed a real flow spelling.** `head -n 1 | grep '\['` only
sees the key line, so a flow list whose value sits on the FOLLOWING line
(`unavailable_markers:\n    ["a", "b"]`) read as block style and got the
corrupting advice. Presence of `- ` items is the discriminator now, which also
gives the empty-key case its own answer: no value means the engine defaults
apply, and those already contain the marker, so asking for it is noise.

**A marker named only in a trailing comment counted as present.** The grep ran
over raw lines, and the kit's own shipped config carries a
`# the status-check wording of …` comment on that exact line — so an adopter
with the phrase in a comment and not in the list would be told nothing. Matched
against comment-stripped values now.

**The no-PyYAML type assertions covered 21 of 25 tokens** while the guard's
docstring claimed they covered the same set as the parity check. The parity test
walks two collections; the guard compared against one. The four missing tokens
are the divergences — exactly where this reader departs from PyYAML on purpose,
so an accidental change there looks like a fix. Both collections are covered now,
and the divergent tokens' string-identity assertion moved out from behind the
`importorskip` it never needed.

Tests 270 → 281.

Claude-Session: https://claude.ai/code/session_011KVJzDj7Z2nYkUjqbGgSVp

* Don't give confident advice about a list the reader can't read

Round 6 found that the previous round promoted a list spelling to "supported"
in the instruction table without checking whether the kit's own reader parses
it. `kitconfig` — what every engine uses — resolves a flow list whose brackets
don't close on the key line to `{}`, and a multi-line one to the string `"["`:

    unavailable_markers: ["a", "b"]        -> ['a', 'b']
    unavailable_markers:\n  ["a", "b"]     -> {}
    unavailable_markers: [\n "a",\n "b"\n] -> '['

So an adopter in either of the latter shapes has NO markers in effect at all,
and "add the string inside the brackets" is advice that fixes nothing. Those
shapes now get told what is actually wrong — the whole list is inert — which is
considerably bigger news than one missing marker. The style detection is
unchanged for the shapes that do work.

Two smaller ones from the same pass:

- **Comment-stripping was quote-unaware**, so a marker containing an issue
  number (`- "tracked in #23: review rate limited"`) was truncated before the
  match and the adopter was asked for a marker they already had. Now scans
  character-wise and only cuts a `#` outside quotes.
- **`grep -qi`'s case-insensitivity had no test** — dropping `-i` passed all 281
  — which is the same untested-branch class the previous round existed to close.

Also corrected in the PR body: the baseline is 202 tests, not 204 (measured at
the merge-base); "four ways to corrupt" is three, matching what init.sh's own
comment enumerates — the fifth round's finding was about the replacement
message, not surgery; and the migration matrix is 8 shapes × 2 tests plus a
separate 5-row instruction table, not 8 × 4.

Tests 281 → 285.

Claude-Session: https://claude.ai/code/session_011KVJzDj7Z2nYkUjqbGgSVp

---------

Co-authored-by: Topi Jarvinen <topi.jarvinen@gmail..com>
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