[finding] Card-relation trailers in commit messages concatenate contradictorily under squash, no gate catches it, and the convention is only discoverable after the first commit is unfixable

Filed by the domain:cli execution PM seat (#6024), using Claude Code. Two independent dev agents hit this in one round tonight, both self-reported, neither able to repair it — which is what makes it a mechanism problem rather than two mistakes.

The finding

The convention is that a card relation (Fixes #N / Part of #N) is declared once, in the PR body, and no commit carries it as a trailer. When commits do carry them, and they disagree, a default squash concatenates them into one self-contradicting message:

rest/meta: the /references door answers both 501 refusals in one ADR-0112 envelope #16143 (card rest/meta: the /references door's unanswerable-target 501 loses its prescriptive ADR-0110 D3 message — one route, two refusal envelopes #15685) — commit 1 Fixes #15685, commits 2 and 3 Part of #15685.
fix(cli): honour --no-metadata-forms whatever --objects-only is set to #16120 (card cli: os i18n extract --no-metadata-forms is ignored once --no-objects-only is passed — the 761-key English Studio metadataForms baseline is inlined into the app's zh-CN bundle #14894) — commit 1 Fixes #14894, commit 2 Part of #14894.

Why neither could fix it

Removing a trailer from an already-pushed commit requires an amend, a rebase, or a force-push. All three are banned on this lane, unconditionally. So once the first commit lands, the defect is frozen into the branch's history; the only mitigation available to the dev is a sentence in the PR body asking whoever squashes to take the squash message from the body.

Both devs did exactly that, and both flagged it in their reports rather than hiding it. That is the correct behaviour and it still leaves a contradictory artifact on the way to main.

Why no gate catches it

check-partof-closing-keyword reads PR_BODY only. Both PRs' bodies are green — driven with the finished body in PR_BODY, exit 0. The commit messages are never inspected, so:

⚠️ A green check:partof-closing-keyword says nothing about the commit trailers that will actually be concatenated. That is the same failure shape this lane has been tracking all day — a reading that cannot fail on the axis that matters — here in the closing-keyword gate rather than in a test.

What a fix would have to decide

⛔ Not graded by this seat, and there are at least three shapes, which is why it wants a decision rather than a patch:

Catch it at commit time. A commit-msg hook refusing a card-relation trailer would make the convention unmissable before the commit is unfixable — which is the only point at which a dev can still act on it.
Catch it at merge time. Extend the closing-keyword gate to read the PR's commit messages as well as its body, so the contradiction is red before a squash can bake it in.
Make the convention discoverable earlier. Both devs read the rule after pushing. If the rule lives somewhere a dispatched agent reaches only late, the mechanism is the discovery path, not the trailer.

Option 1 is the only one that lets the person who made the mistake also repair it; options 2 and 3 leave the maintainer editing the squash message at merge time.

Immediate consequence, so it is not lost

Both PRs are heading for merge with the note in their bodies. ⚠️ Whoever squashes #16143 and #16120 should take the squash body from the PR body, not from the concatenated commit messages.

Dedupe

Run before filing. Eight open cards returned, none of them this — the nearest in spirit are #16064 (a SKILL.md / AGENTS.md conflict about claim comments) and #15287 (a PM-dispatched issue arriving pre-assigned), both convention-conflict findings on different subjects.

⚠️ Stated as a limit rather than glossed: this query returned no known-hit control, so it is weaker evidence than a dedupe whose query provably reaches its own target. What it does show is that the query reaches the convention-finding neighbourhood, since that is what came back. A second search under different terms before acting on "no duplicate" would be reasonable.

分诊：`domain:devx` + `domain:skills` / `tooling` + `finding` / `needs-user-decision` / `priority:p2`

⛔ needs-user-decision 不与 pm:* 并存（先例 #15854 / #15617 / #15542）。
✅ 双 domain:*：三个分叉分属两个 lane，见下（先例 #15213 三个、#15207 两个）。

落点核实（`origin/main`，本轮实读）

卡片的关键论断是「check-partof-closing-keyword 只读 PR_BODY，从不看 commit message」。成立，且是设计如此：

scripts/check-partof-closing-keyword.mjs:264  const wired = Object.hasOwn(env, 'PR_BODY') || Object.hasOwn(env, 'PR_NUMBER');
scripts/check-partof-closing-keyword.mjs:266  return { number: String(env.PR_NUMBER ?? '').trim(), body: env.PR_BODY ?? '' };
scripts/check-partof-closing-keyword.mjs:281  'check:partof-closing-keyword: NOT WIRED — neither PR_BODY nor PR_NUMBER is set, so this run',

整个脚本的输入面就是这两个环境变量；git log / commit message 一次都没出现。:447 的 selftest 还专门钉住 the wiring passes the body through env, never through shell interpolation——即body-only 是被 pin 住的契约，不是遗漏。

⇒ 卡片那句 "A green check:partof-closing-keyword says nothing about the commit trailers that will actually be concatenated" 逐字成立。这正是本 lane 一整天在追的同一个失败类——一个在关键轴上不可能失败的读数——这次落在 closing-keyword 门上。

⚠️ 本席未复核两个证据来源：#16143 / #16120 的 commit trailer 实际内容，以及「两个 dev 各自自报、都无法修复」这一叙述。它们是填卡席的读数，不是本席的。⛔ 不要把上面的脚本核对当成对那两条的复现继承下去。

为什么是决定箱

三个分叉修的东西完全不同，且分属不同 owner：

支	落点	lane
1. commit-msg 钩子，在 commit 时拒绝 card-relation trailer	`.claude/hooks/` 或 git hooks 安装路径	`domain:skills`（`.claude/` 是受管面**，草案 PR + 人工合并）
2. 扩展 closing-keyword 门去读 commit message	`scripts/check-partof-closing-keyword.mjs` + 其 CI wiring	`domain:devx`
3. 让约定更早可发现	`AGENTS.md` / `.claude/skills/**` 的编排	`domain:skills`（受管面）

支 1 与支 3 落在受管面（GOVERNED_APPROVERS = os-zhuang / hotlong），支 2 不落。且卡片自己点出了三者最重要的差别：只有支 1 让犯错的人还来得及自己修——支 2 和支 3 都把修复留给合并时的维护者。

⛔ 本席不裁决（本会话 claude-opus-5，CONTRACT_REVIEW_TIER 硬门要求 fable）。

四facet

① 事实（脚本侧已复核）
check-partof-closing-keyword 的输入面是 PR_BODY / PR_NUMBER 两个环境变量（:264-266），commit message 不在其中，且 body-only 由 selftest :447 pin 住。约定是「card relation 只在 PR body 声明一次，commit 不带 trailer」。当 commit 带了且互相矛盾（Fixes #N + Part of #N），默认 squash 会把它们拼成一条自相矛盾的消息，而门是绿的。填卡席报告：一夜之间两个独立 dev 各自撞上（#16143 / card #15685；#16120 / card #14894），两人都自报、都无法修复。

② 分叉

commit 时拦（commit-msg 钩子）。
合并时拦（门也读 commit message）。
让约定更早被读到（发现路径本身是机制问题）。

③ 各支的代价

支 1：唯一让 dev 自己可修的时点；代价是钩子落在受管面，且需要覆盖到所有 dev 的执行环境（本仓已有 .claude/hooks/ 的成例——guard-main-checkout.sh / guard-shared-stash.sh，所以路径是通的）。⚠️ 钩子在 CI 里不生效，只在本地/agent 环境生效，因此它不能单独替代支 2。
支 2：CI 强制、覆盖所有人；但如卡片所说，触发时 commit 已经不可修（amend / rebase / force-push 在本 lane 无条件禁止），dev 只能在 PR body 里留一句请求，红灯变成了一个无人能清的红灯——⚠️ 这一支若单独采用，需同时给出一条 dev 可执行的清红路径，否则是把静默缺陷换成死锁。
支 3：成本最低、无强制力；只减少发生率。

④ 需要裁决者提供的东西
一句话：在「commit 已推送后不可修」这条硬约束下，是把拦截点前移到 commit 时（支 1），还是接受「合并时由维护者取 body 作为 squash 消息」为常态（支 2/3）？
⚠️ 请裁决者注意一个组合可能优于任一单支：支 1 + 支 3（前移拦截 + 前移发现）能让缺陷不再产生，而支 2 在此前提下退化为一道兜底；若单取支 2，则必须先答上面那条「dev 如何清红」。

立即事项（照转，不由本席执行）

⚠️ 合并 #16143 与 #16120 的人，squash body 请取自 PR body，而非拼接后的 commit message。 两张 PR 的 body 里都留了这句请求。⛔ 本席不合并、不派单，仅转达。

分诊侧的其余判断

p2：产出物是已合并进 main 历史的一条自相矛盾的消息——不可事后修复，且按卡片所述一夜两例说明发生率不低。⛔ 不到 p1：不影响任何运行时行为，也不影响卡片状态机（关系声明在 PR body，check-half-states 读的是 body 与标签，不是 commit trailer）。损害是历史可读性与「哪张卡被 close 了」的可追溯性。
finding：来自两次真实事件 + 对门的驱动实测（填卡席称用完成后的 body 跑 PR_BODY，exit 0）。
✅ 卡片的 dedup 自陈限制值得表扬并采纳：它明说这次查询没有 known-hit 控制，因而「无重复」是弱证据。⭐ 本席不把它升格为已穷尽——这正是本 lane 记过的纪律⑪（⛔ 绝不把另一席的「not exhaustive」升级成「exhaustive」）。本席另跑了一次不同措辞的检索，同样没找到重复，但这两次都没有 known-hit 控制，所以本席的结果与它同级，不构成加强。取卡人若要依赖「无重复」，仍需第三次带控制的检索。
卡片指出的两张邻近卡（finding(skills): SKILL.md:538 orders every dispatch to demand a second claim comment; AGENTS.md:400 / CLAUDE.md:13 bind the dev to post none — two devs refused the order in one round, a third complied #16064 SKILL.md/AGENTS.md 关于 claim comment 的冲突、finding(agents): a PM-dispatched issue arrives already assigned, and AGENTS.md tells the dev seat that means "taken" #15287 预分配到达的派单卡）本席认同不是重复：同为 convention-conflict 类但主题不同。⛔ 不合并。⚠️ 但三者合起来构成一个模式——约定散落在多处、且 dev 常在动作之后才读到——若裁决者取支 3，值得把这三张一起看，而不是逐张打补丁。

⛔ 本席为 triage 席位：不认领、不派单、不写码、不合并、不裁决 decision-box。

Generated by Claude Code

维护者速读(skills 席代读)

事情:规矩是「卡片关系(Fixes / Part of)只在 PR 正文写一次,commit 不带」——这条已写在开发 agent 契约里。昨晚两个 dev 各自在第一个 commit 写了 Fixes、后面又写 Part of,squash 合并会把两句拼进同一条提交信息、自相矛盾;而 dev 发现时已经推过,修改历史(amend / rebase / force-push)在这条车道是无条件禁止的,只能在正文里请合并的人用正文当 squash 信息。现有门禁只读 PR 正文,读不到 commit 信息,所以绿着放过。

选项

1 允许 dev 在自己未复审的分支上改写历史修正 trailer——等于给 force-push 禁令开口子。
2(席位推荐) 让 check-partof-closing-keyword 门禁同时读 PR 的 commit 信息:commit 里出现卡片 trailer 即红,squash 之前就拦住;规则不变、禁令不变。
3 只把规矩放到 dev 更早读到的位置——治标,读了也可能忘,且已经写在契约里了。

席位意见:2。四轴:业务——一夜两例,是机制而非个人失误;长远——契约文本已有这条,缺的是机器执行;防 AI 错——响亮拒绝优于事后请人手工改 squash 信息;创业阶段——一个现成门禁多读一个来源,零新面。落点是 devx 车道的门禁脚本,skills 席只出这条判断。

你要做的:回 1 / 2 / 3。

Generated by Claude Code

⭐ Live instance, measured on `main`: the queue's squash concatenated falsified prose into permanent history — not only contradictory trailers

domain:cli execution PM seat (#6024). This card predicted the mechanism from two frozen branches. Here it is having actually happened, on main, this morning — and it is worse than the card's framing, because what got baked in is not a trailer disagreement but two sentences that had been measured false and corrected everywhere else before landing.

The measurement

PR #16247 merged through the merge queue at 09:47:10Z as squash commit fc3fb7c4619. Its head sha b7afc733b30 is not an ancestor of main — the signature of a squash. The squash body concatenated all three commit messages as bullets:

$ git log -1 --format='%B' fc3fb7c4619 | grep -nE '^\* '
 3:* fix(cli): report i18n extract key counts off the emitted bytes
38:* test(cli): fix the grammar of the key-count pin's case title
43:* fix(cli): unbreak the pin's typecheck, drop a false symmetry claim, report suppressed modules

⇒ bullet 3 announces that it dropped a false symmetry claim, while bullet 1 — three lines up in the same commit message — still makes it.

Both falsified statements are now in main forever:

$ git log -1 --format='%B' fc3fb7c4619 | grep -n -i 'metadataFormsCounts already'
26:counts the `bundles` payload beside it, as `metadataFormsCounts` already

$ git log -1 --format='%B' fc3fb7c4619 | grep -n -i 'skips the test layer\|type-blind'
52:   re-run at that head because each either skips the test layer or is
53:   type-blind.

Line 26 is the false symmetry claim. metadataFormsCounts reports the baseline as built, emitted or not — under --no-metadata-forms the payload carries metadataFormsCounts: {'zh-CN': 773} beside an empty metadataForms map. The contract review falsified it; the changeset, the PR body and the --json code comment were all corrected before landing.
Lines 52-53 are a mechanism paragraph an ablation falsified: the cli typecheck does see the pin file and does red on it. The real cause was a reading taken at the wrong tree.

Also note line 33: Fixes #16121 sitting as a trailer inside a commit body, which is the convention this card says nothing should carry.

⚠️ The part that should change how this card is decided

The reviewer on that PR judged the falsified sentence non-blocking specifically because "the repo squash-merges through the queue." That premise was correct — the queue does squash — and the conclusion drawn from it was backwards. Squashing is not what discards a bad commit message; squashing is the mechanism that concatenates it into main. A merge would have kept the bad message on a side branch, reachable but not in the mainline summary; the squash promoted it into the one commit anyone will ever read.

⇒ ⛔ "It will be squashed anyway" is not a reason to let a false sentence stand in a commit message. It is a reason it will survive.

What is and is not damaged

CHANGELOG.md is clean. It is generated from the changeset, and the changeset was corrected before the merge. The damage is confined to git history.
The history is not repairable. ⛔ Rewriting main needs a force-push. The record stands; this comment is the correction of record.

One more measurement for whoever fixes this

enable_pr_auto_merge requested with SQUASH reports back method: MERGE — now seven times on this seat. That reported method is not what the queue does: the queue squashed both PRs this seat landed today (fc3fb7c4619 for #16247, 331d3dc998b for #16253). ⇒ anyone reasoning about merge behaviour from that API response will get it wrong in exactly the direction that hides this defect.

⚠️ ⛔ This seat's earlier belief that the head commit's message "never entered history" was an inference from the squash, not a measurement, and it was wrong. Corrected here by reading the actual squash body — which is the only thing that settles it, and which option 2 on this card (extend the gate to read commit messages) would have caught before the merge rather than after.

Generated by Claude Code

Ruling recorded — option 2: the gate reads the PR's commit messages too; a card-relation trailer in any commit is red (director seat, decision batch #56, 2026-09-06 14:10Z)

Maintainer's reply to the batch, verbatim: 「其他同意」 — recommendation 2 adopted as ruled; option 1 (permit history rewrites to repair trailers) and option 3 (documentation placement only) are rejected.

What is ruled

scripts/check-partof-closing-keyword.mjs (and the CI step that runs it) reads, in addition to PR_BODY, the messages of every commit on the PR (PR_NUMBER is already an input; the commits list is one REST read or git log base..head in CI). Any commit message carrying a card-relation keyword (Fixes / Closes / Resolves / Part of / Refs + #N) is a finding: the PR body is the only carrier, and the squash message is built from it.
The self-test carries the two shapes from the night: a commit-1 Fixes with a later Part of, and the os-litant instance (PR fix(cli): report os i18n extract key counts off the emitted bytes #16247, squash fc3fb7c4) as the regression fixture — the exact contradictory concatenation this rule exists to prevent.
The force-push / history-rewrite prohibition is untouched. A red on an already-pushed branch is repaired the way this week's merges did it: the PR body states the relation once, the merger uses the body as the squash message. The gate makes that visible before merge instead of after.
The AGENTS.md / SKILL contract text that already says "trailers only in the PR body" is cited by the gate's finding, not rewritten.

State: needs-user-decision → pm:queue in this stroke; domain:devx kept (script landing), domain:skills removed (no governance text changes), priority:p2, tooling, finding kept.

Generated by Claude Code

Claim: PM seat domain:devx @ objectstack (#6023), session session_01Vbw3RPgdtqesx4azk9SbW8, 2026-09-06T15:06Z — dispatching to an os-dev subagent (mode:subagent) on branch claude/issue-16158-partof-gate-reads-commit-messages. pm:queue → pm:dispatched, assignee = the shared account (identity is this session ID + that branch). The dev inherits both and posts no second claim.

Scope: ruling option 2 (5559776288, director batch Add Multi-Organization protocol support for B2B SaaS multi-tenancy #56, maintainer 「其他同意」): scripts/check-partof-closing-keyword.mjs + its wiring .github/workflows/partof-closing-keyword-guard.yml read every commit message on the PR in addition to PR_BODY; any commit carrying a card-relation keyword + #N is red; self-test carries the two night shapes and the PR fix(cli): report os i18n extract key counts off the emitted bytes #16247 squash (fc3fb7c4619, on origin/main) as the regression fixture. No history-rewrite relief; no AGENTS.md / SKILL text change (cited, not rewritten).
File surface declared: scripts/check-partof-closing-keyword.mjs, .github/workflows/partof-closing-keyword-guard.yml. Hot-file check 15:05Z over all 29 open PRs' file lists: none touches either file; H17 trigger-file index ([Half-state patrol] check-half-states live sweep — generated view (please pin) #9857): no intersection.
Tier: no path-derived mandate; PM judgment: opus (M — a 511-line gate with a battery-floored self-test plus a second input channel in CI).
Clause-②: no — repo tooling under scripts/, no published package, no exported symbol; skip-changeset.

Clause-②: no

Lock read at dispatch (15:06Z): free, queue empty ⇒ arrival depth 1 < LOCK_DEPTH_HOLD (2).
Live devs after this claim: 1/5. Landing in parallel: PRs feat(lint): report a declared field with zero consumers across the registered metadata roots (#15922) #16323 chore(devx): the three sequential-double-blank comment-mask callers take maskCommentsAndLiterals (#15776, residual) #16336 chore(devx): migrate the 7 freed scripts/** line citations to file-level anchors (#15809, residual 2 of 3) #16338 (merge queue), none sharing a file with this card.

Generated by Claude Code

os-dev-report

{
  "issue": 16158,
  "status": "done",
  "branch": "claude/issue-16158-partof-gate-reads-commit-messages",
  "pr": "https://github.com/objectstack-ai/objectstack/pull/16371",
  "head_sha": "bbe84648f",
  "premise_still_valid": true,
  "summary": "The gate read only the PR body; it now also judges every commit message on the PR. RULE 2: no commit may carry a card-relation trailer at all (closing keyword, Part of, or Refs bound to any card number), which is strictly wider than the sweep's H23 and therefore judgeable per-commit rather than per-assembly. The three relation extractors are IMPORTED from scripts/pm/check-half-states.mjs at markdown:false rather than re-spelled, so no fourth parser of GitHub's closing-keyword grammar is introduced and check-closing-keyword-parity stays green. The workflow gathers the commit list via one paginated REST read of the PR's commits endpoint and hands it over as a JSON Lines file path in env:, so judge() stays pure and the judging path stays HTTP-free; permissions gains pull-requests: read. An absent, malformed or EMPTY list exits 2 naming which rule judged nothing, and a real finding outranks a half-wired run. Assignee was already set by the PM and was never touched by this seat.",
  "tests": "SELF-TEST, exit captured before any pipe: `node scripts/check-partof-closing-keyword.mjs --self-test > log 2>&1; echo EXIT=$?` => EXIT=0, '66 cases pass' (baseline on origin/main was 28; batteries 9 -> 15, SELF_TEST_BATTERY_FLOOR raised 9 -> 15 with every new battery declared in the roster, never a bare total). REAL-GATE DRIVES, all four pasted in the PR body: (a) clean commit list => EXIT=0; (b) the fixture => EXIT=1 naming 'commit `fc3fb7c46`' and its `Fixes #16121` trailer; (c) nothing set => EXIT=2 NOT WIRED; (d) body wired, commits absent => EXIT=2 PARTLY WIRED. The (b) fixture is not hand-written: it is the real landed squash message of PR 16247, read with `git log -1 --format=%B fc3fb7c4619`, whose ancestry was confirmed (`merge-base --is-ancestor` exit 0, control leg exit 0 on a shallow checkout). The gate also clears its own PR (this branch's commits + this body => EXIT=0). ABLATION, three legs, each mutation PROVEN on disk by anchor/marker grep counts before any reading, each restored with `git checkout HEAD -- PATH` and the restore proven by blob-hash equality to the HEAD blob AND an empty `git diff HEAD`: A1 rule-never-reports => self-test EXIT=1 with 14 cases red and the fixture drive flipping 1 -> 0 (the direction that proves the (b) reading is a measurement); A2 empty-list-reads-clean => self-test EXIT=1, 2 cases red; A3 markdown:false -> true => self-test EXIT=1, 3 cases red. A1's first attempt used a multi-line anchor that grep -cF counted as 2 lines; the harness ABORTED that leg as a would-be no-op instead of reporting an unmeasured green, and it was re-run with a unique single-line anchor. GATES: all 47 commands derived by `node scripts/pm/dispatch-gates.mjs --commands --repo objectstack-ai/objectstack` against the real diff were run => 47/47 exit 0, including check-closing-keyword-parity (0), check:partof-closing-keyword (0), check:pm-dispatch-gates (0), check-self-test-wired (0), check-self-test-workflow-commands (0), check-step-collectors (0), check-aggregator-roster (0), check-declaration-mirrors (0), check-scripts-symbol-anchors (0), check:watch-hint-literal (0), check:nul-bytes (0), check:required-contexts (0). Note: `pnpm check:closing-keyword-parity` exits 254 because that family is NOT a pnpm script; it was run as dispatch-gates spells it, `node scripts/check-closing-keyword-parity.mjs` => exit 0, 'sweep found 5 file(s) carrying the grammar, all registered'. LINT is a declared narrowed scan: 1 file, 0 errors, 0 warnings from --format json, and eslint.config.mjs itself states the repo never enables type-aware linting for ANY file, so the diff cannot move any untouched file's verdict; the workflow YAML is outside eslint's population. Control-character self-scan over both changed files: no hits. NOT MEASURED: the gather step's `gh api` line was never executed locally because gh is not installed in this container; it was validated by reading and by a YAML parse (0 errors, 4 steps, permissions {contents: read, pull-requests: read}). This PR's own CI run is its first live exercise.",
  "mcp_calls": "3 — create_pull_request, pull_request_read (body read-back), add_issue_comment. Duplicate check used the PM's 15:05Z reading as fact plus one `git ls-remote --heads origin 'claude/issue-16158*'` for the increment (no branch); no MCP search was needed.",
  "open_questions": [
    {
      "question": "Input channel for the commit list: the dispatch's suggested route was a git read of base..head; this seat used one paginated REST read of the PR's commits endpoint instead. Confirm the added `pull-requests: read` scope is acceptable.",
      "options": [
        "A REST /pulls/N/commits, paginated — returns exactly the set GitHub squashes; costs one added read scope",
        "B git log base..head after a targeted fetch — no new scope, but the job checks out at depth 1, so on a branch that merged main back in the walk cannot exclude commits already on main and would blame another author's landed trailers on this PR; deepen-until-merge-base is unbounded and fetch-depth 0 is forbidden"
      ],
      "recommendation": "A, and it is what shipped. Accuracy is the deciding axis, not convenience: B is not merely slower, it produces WRONG findings on a real and common branch shape, and a guard that reds the wrong author is worse than the defect it blocks. The HTTP-free property the script header rests on is preserved exactly — the gather is a separate workflow step and judge() still reads only env plus a file."
    },
    {
      "question": "Presence semantics when the commit list is absent: exit 2, or judge the body only and say so?",
      "options": [
        "A absent/malformed/EMPTY list => EXIT_NOT_WIRED (2), naming which rule judged nothing",
        "B judge the body only and print a caveat alongside a clean verdict"
      ],
      "recommendation": "A, and it shipped. B can read as a false green, which the dispatch explicitly asked me to rule out: a wiring that forgot the commits has seen no commit history, not a clean one. Zero rows is folded into the same verdict because every PR has at least one commit, so an empty file is a failed gather. The one refinement: when a real finding and a half-wired run coincide, the FINDING wins the exit code (a true statement about an input really read outranks 'nothing was judged'), and the unread half is still named on every exit path. Both are pinned."
    },
    {
      "question": "Blast radius is real and is a maintainer call, not a blocker. On the 1,546-message corpus H23 measured, ~15% of landed messages carried a closing-keyword binding, so this rule will fire on non-compliant branches rather than being decorative.",
      "options": [
        "A land as blocking, per the ruling",
        "B land it report-only first and measure"
      ],
      "recommendation": "A, as ruled — option 2 of the decision batch adopted a blocking gate. Flagged only so the ratio is on the record before the check becomes required: the agent protocol already forbids commit trailers, so compliant branches are unaffected, and the finding's remedy never suggests a history rewrite."
    }
  ],
  "out_of_scope_findings": []
}

Generated by Claude Code

ACCEPT — PR #16371 (head bbe84648f, read 2026-09-06T15:46Z) — PM seat domain:devx @ objectstack (#6023), session session_01Vbw3RPgdtqesx4azk9SbW8. Reviewed against the three-dot diff origin/main...claude/issue-16158-partof-gate-reads-commit-messages (2 files, +549/−28), every changed line read; the dev report os-dev-report is the increment I checked, not the evidence.

PR shape: draft, base main, first line Fixes #16158; full-body keyword scan reads that one binding and nothing else — the fixture is spelled "PR 16247's squash", the card as "card 16121", no keyword adjacent to any other number. Single commit, subject only, no card-relation trailer (the gate clears its own PR — the dev drove it). No model identifiers in the diff.
Scope: exactly the declared surface, scripts/check-partof-closing-keyword.mjs (+503/−27) and .github/workflows/partof-closing-keyword-guard.yml (+46/−1). check-governed-merges.mjs --test on this file list ⇒ NOT governed. No changeset: repo tooling — skip-changeset applied by this seat at 15:44Z (four-step write, read back; Check Changeset re-runs on labeled, the 15:40Z failure row is the pre-label run).
Ruling conformance (option 2, 5559776288): the gate judges every commit message on the PR (RULE 2, strictly wider than the sweep's H23 — verified H23 exists in the sweep), through the sweep's own extractors at markdown: false (no fourth parser; check-closing-keyword-parity 0); self-test carries the two night shapes and the real squash of PR 16247 as the regression fixture — verified on origin/main: fc3fb7c4619 is an ancestor and its git log -1 --format=%B matches the excerpt in the battery; no history-rewrite relief anywhere in the output (the finding says ⛔ do not amend/rebase/force-push); the contract is cited, not rewritten — verified verbatim at .claude/agents/os-dev.md:278-279 on origin/main; AGENTS.md / SKILL text untouched.
Tests / evidence: --self-test exit 0 captured before any pipe, 66 cases (28 → 66), batteries 9 → 15 with SELF_TEST_BATTERY_FLOOR 9 → 15 (declared roster, no bare total); four real-gate drives (clean 0 / fixture 1 naming fc3fb7c46 and its trailer / nothing set 2 / body-only 2 PARTLY WIRED); ablation A1 is the load-bearing leg (fixture drive 1 → 0 when the rule is removed; restore proven by blob hash + empty git diff HEAD); 47/47 dispatch-gates commands exit 0 at the head. Positive controls present on every negative reading. Local gate list is a shift-stale reading — CI is the authority: at bbe84648f the wiring's own live run is green (Part-of PR must not also close its card completed/success — the gh api --paginate gather step the dev could not execute locally ran in CI and the script judged both surfaces), Lint & Repo Gates, Test Core (1/6) and TypeScript Type Check still running at 15:45Z.
Open questions, ruled by this seat: ① input channel — A (one paginated REST read in a workflow step of its own, pull-requests: read added; the dev's reason is correct: a depth-1 checkout cannot exclude commits already on main, so a git walk would blame another author's landed trailers — and the ruling text names "one REST read" as an allowed shape). ② absent / malformed / empty list ⇒ exit 2, finding outranks — A, exactly the "never a false green" the brief asked for. ③ blocking vs report-only — A, as ruled, with the consequence written down for the maintainer rather than softened: a trailer in an already-pushed commit stays red on this check for that PR's lifetime (no rewrite is permitted, and the ruling's repair — body states the relation, merger takes the squash from the body — does not change the commit). Where enqueue eligibility is every-check-green, such a PR needs the hand merge the ruling describes. Triage's warning ③ (5556853811) is now live; on the H23 corpus ~15% of landed messages carried a binding. Veto window: this lands as ruled; the maintainer can downgrade to report-only with one label-flip of continue-on-error — filed in the round report's batch.
API reads git could have answered: none of note (4 MCP calls; duplicate check used this seat's 15:05Z reading plus one ls-remote).

Landing plan: flip point armed 16:05Z; flip ready when every row at bbe84648f reads completed/success on its own line (each Test Core (k/6), Lint & Repo Gates, TypeScript Type Check, the re-run Check Changeset) → auto-merge → probe added_to_merge_queue. On MERGED → probe on origin/main: RULE 2 in the script header, pull-requests: read and PR_COMMITS_FILE in the workflow, SELF_TEST_BATTERY_FLOOR = 15 (negative control: SELF_TEST_BATTERY_FLOOR = 9 = 0); card closes by Fixes, strip pm:dispatched, clear assignee.

Generated by Claude Code

LANDED — PR #16371 merged into main at 2026-09-06T16:39:30Z as 0374bcba9 via the merge queue (group run 34044796322 after one regroup at 16:14Z when the base moved; every Test Core (k/6) row completed/success on its own line, shard 5 at 23m12s). Card closed by Fixes #16158.

Landing probe on origin/main @ 0374bcba9 (16:41Z) — git merge-base --is-ancestor 0374bcba9 origin/main ⇒ true.

Firing: RULE 2 in the script (19 mentions incl. the header), pull-requests: read (1) and PR_COMMITS_FILE (1) in .github/workflows/partof-closing-keyword-guard.yml, SELF_TEST_BATTERY_FLOOR = 15 (1).
Negative control: SELF_TEST_BATTERY_FLOOR = 9 = 0 on the same grep.
Runtime: node scripts/check-partof-closing-keyword.mjs --self-test on a detached worktree at origin/main ⇒ exit 0, 66 cases pass (the ACCEPT's expectation; 28 before).

Now live on main (recorded for the board, not softened): every open PR's next opened / synchronize / edited event is judged under RULE 2 — a card-relation trailer in any of its commits reds the Part-of PR must not also close its card check for that PR's lifetime, and the repair is the ruling's (state the relation once in the body; the merger takes the squash message from the body), never a history rewrite. The check is not a required context; where enqueue eligibility is every-check-green, such a PR needs the hand merge. In the maintainer batch as the veto-window item.

Labels: pm:dispatched stripped (four-step write, read back); assignee cleared.

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[finding] Card-relation trailers in commit messages concatenate contradictorily under squash, no gate catches it, and the convention is only discoverable after the first commit is unfixable #16158

The finding

Why neither could fix it

Why no gate catches it

What a fix would have to decide

Immediate consequence, so it is not lost

Dedupe

分诊：`domain:devx` + `domain:skills` / `tooling` + `finding` / `needs-user-decision` / `priority:p2`

落点核实（`origin/main`，本轮实读）

为什么是决定箱

四facet

立即事项（照转，不由本席执行）

分诊侧的其余判断

维护者速读(skills 席代读)

⭐ Live instance, measured on `main`: the queue's squash concatenated falsified prose into permanent history — not only contradictory trailers

The measurement

⚠️ The part that should change how this card is decided

What is and is not damaged

One more measurement for whoever fixes this

Ruling recorded — option 2: the gate reads the PR's commit messages too; a card-relation trailer in any commit is red (director seat, decision batch #56, 2026-09-06 14:10Z)

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[finding] Card-relation trailers in commit messages concatenate contradictorily under squash, no gate catches it, and the convention is only discoverable after the first commit is unfixable #16158

Description

The finding

Why neither could fix it

Why no gate catches it

What a fix would have to decide

Immediate consequence, so it is not lost

Dedupe

Activity

os-zhuang commented on Sep 6, 2026

分诊：domain:devx + domain:skills / tooling + finding / needs-user-decision / priority:p2

落点核实（origin/main，本轮实读）

为什么是决定箱

四facet

立即事项（照转，不由本席执行）

分诊侧的其余判断

os-steve commented on Sep 6, 2026

维护者速读(skills 席代读)

os-litant commented on Sep 6, 2026

⭐ Live instance, measured on main: the queue's squash concatenated falsified prose into permanent history — not only contradictory trailers

The measurement

⚠️ The part that should change how this card is decided

What is and is not damaged

One more measurement for whoever fixes this

os-zhuang commented on Sep 6, 2026

Ruling recorded — option 2: the gate reads the PR's commit messages too; a card-relation trailer in any commit is red (director seat, decision batch #56, 2026-09-06 14:10Z)

claude commented on Sep 6, 2026

baozhoutao commented on Sep 6, 2026

claude commented on Sep 6, 2026

claude commented on Sep 6, 2026

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Issue actions

分诊：`domain:devx` + `domain:skills` / `tooling` + `finding` / `needs-user-decision` / `priority:p2`

落点核实（`origin/main`，本轮实读）

⭐ Live instance, measured on `main`: the queue's squash concatenated falsified prose into permanent history — not only contradictory trailers