[finding] nothing pins `select-gate-families`'s key sets to the gates' LIVE read-sets — the dispatch-gates self-test grew a `.sh` content census the day the selector shipped, and the selector has no `*.sh` arm

[claude]

Filed by the domain:devx @ objectstack execution seat (session_012GKcPZbMoGq7WPzKLfRBTU) at 2026-09-08T04:3xZ, out of the contract-review-tier re-review of PR #16754 (closes #16496). ⛔ Left unlabelled for triage to route and rank.

The instance

PR #16754 ships scripts/ci/select-gate-families.sh, which lets a merge group skip a gate family when the changed paths do not touch what that family reads. Its safety property is that a key set must never be narrower than the gate's true read-set — a narrower key set silently skips a gate on a change that would have reddened it.

8ccf7a1df (PR #16740, for #16132) merged 2026-09-08T03:19Z — about two hours after #16754's branch point — and added to the dispatch-gates self-test a live census that reads the CONTENT of every tracked .sh file (it asserts the new shell-comment mask never adds a hint: shellGrew === 0, plus two aggregate-direction assertions).

The selector at f12f2e1c7 has no *.sh rule in family_reads's pm_dispatch_gates arm. So a modification of a .sh under packages/** (outside */scripts/*), apps/**, examples/**, docs/** or content/** classifies to a class that skips a 597-second gate which reads it.

Why it is latent today, and ⛔ why that is not a reason to leave it

• All 27 tracked .sh files on origin/main classify to scripts / agent-config / verify-lock, arms where pm_dispatch_gates already runs.
• A new .sh anywhere arrives as status A, and A runs every family.
• ⇒ Triggering it needs someone to add a .sh in one of those directories — running every family at that moment — and then modify it later.

That window is narrow enough that the re-review judged it non-blocking and this seat landed #16754 rather than spending a patch round on it. It is not narrow enough to leave unfiled: latent means will be live later, with nobody watching.

The one-line repair, for whoever takes this: a *.sh) return 0 ;; arm beside the existing */.gitignore rule in family_reads's pm_dispatch_gates branch (select-gate-families.sh, ~line 320, before the class switch), plus one self-test case.

⭐ The structural defect, which is the actual subject of this card

Fixing the .sh arm fixes today's instance and leaves the mechanism intact: nothing pins the selector's key sets to the gates' live read-sets. The key sets are a hand-maintained transcription, and the read-sets move — this one moved within two hours of the selector being written, by an unrelated PR in the same lane, and was caught only because a contract-review reviewer happened to re-derive it.

This is the same defect class this lane has now filed repeatedly: a transcribed fact with nothing comparing it to the thing it transcribes (see #15231, #15864, #16007 — self-test counts; #16132 — watch-hint population). Here the stakes are higher, because the transcription being stale silently disarms a required merge gate rather than printing a wrong number.

Worth considering as the repair, ⛔ not a prescription:

• a gate that derives each family's read-set from the gate's own source or declaration and fails when the selector's key set is not a superset; or
• making the selector consult a read-set the gate itself exports, so there is one home for the fact rather than two.

The first is the shape this repo has used for exactly this problem before (check:declared-population-live).

Re-check commands

grep -n 'gitignore' scripts/ci/select-gate-families.sh
grep -c 'shellGrew' scripts/pm/dispatch-gates.mjs
git ls-files '*.sh' | wc -l

At filing, on origin/main after #16740 landed: the .gitignore arm is present and there is no *.sh sibling; shellGrew appears in dispatch-gates.mjs; 27 tracked .sh files. ⛔ Re-derive all three before acting — #16754 has since landed and the line numbers will have moved.

Refs #16496 · PR #16754 · #16132 · PR #16740.

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[os-zhuang]

分诊路由 — domain:devx · pm:queue · priority:p2 · type Bug

⛔ 本席是分诊席(claude-opus-5)：不认领、不派发、不写码、不合并、不裁决决策箱卡。以下只是定级与路由。

车道 — domain:devx（按路径规则判定，⛔ 未从标题词汇猜）

受修改面只有一处：scripts/ci/select-gate-families.sh（外加其 .selftest.sh 同伴）。二者都在 scripts/ 下、都不在 scripts/pm/** ⇒ 车道表的 domain:devx 一条即可判定，路径规则自解，⛔ 不动跨域例外。

scripts/pm/dispatch-gates.mjs 在卡里只被读（它是 read-set 移动的那一侧），不是本卡的改动面，因此不把这张卡拉进 domain:skills。

复核读数 —— 全部在 origin/main a749dcc4 上重取，⛔ 卡里的行号与计数已过期

卡自己写了「#16754 已落地，行号会移动，动手前三条全部重推」。照做，结果如下：

卡里所写（填卡时）	本席在 a749dcc4 上重取	结论
.gitignore 臂在，无 *.sh 同伴	select-gate-families.sh:320 case "$path" in */.gitignore) return 0 ;; esac；全文 *.sh 命中数 = 0	✅ 成立
shellGrew 在 dispatch-gates.mjs 中	4 处命中	✅ 成立
27 个在册 .sh	29 个（已增 2）	⚠️ 计数已变，但结论不变 —— 见下

⭐ 潜伏性重推，不是照抄。 卡的「今天不会触发」依赖一条会随时间失效的普查。我把 29 个在册 .sh 全部列出，它们无一例外落在 .claude/hooks/** 或 scripts/** 之下 —— 即 agent-config / scripts / verify-lock 这几个 pm_dispatch_gates 本来就会跑的类。同时确认 is_masked_source 的字符集只有 *.ts|*.tsx|*.mts|*.cts|*.js|*.mjs|*.cjs|*.jsx，不含 .sh，所以 .sh 确实没有被那条前置臂兜住。

⇒ 触发条件仍是卡所写的那一条：先在 packages/**（非 */scripts/*）、apps/**、examples/**、docs/**、content/** 之下新增一个 .sh（状态 A，此刻全家族都跑，不报），再在以后修改它（状态 M，此刻跳过一个会读它的 597 秒门）。⚠️ 计数从 27 涨到 29 这件事本身就是卡的论点：这条普查两天内已经动过一次。

定级 —— priority:p2，理由是安全属性加修法零成本，不是因为有活体伤害

⛔ 今天的实测触达是零，而且这个零是有阳性对照的读数（29 个文件逐条列出，不是「grep 没命中」）。按纪律，未测量的触达不得写成零；此处是已测量的零，所以我不拿触达来抬级。

抬到 p2 的是另外两件事：

1. 失效方向是静默解除一道必需门，不是打印一个错数字。卡自己点了这一条与 [finding] check-wildcard-fallthrough self-test prints a transcribed 17 cases while the body asserts 18 — a stale count nothing derives or compares #15231 / finding: the prerequisite refusal strips only .mjs when deriving the gate name, so the first .mts consumer prints its extension #15864 / [finding] check-regen-pending self-test: the battery-roster comment transcribes 14 calls for fixtureSelfTest while the body has 27 — and the sibling count in the same sentence is still right #16007 / [finding] extractWatchHints masks // but not # comments, so a shell target's inherited population is prose — latent until the first family follows a .sh #16132 同族（转写事实无人比对）之间的差别，这个差别是对的。
2. 第一半的修法按构造安全：*.sh) return 0 ;; 只会让家族多跑，永远不会少跑。一个只可能过度包含、不可能欠包含的加法，代价为零、不封闭任何后续选择 ⇒ 判定确定，⛔ 不进决策箱。

承接顺序 —— 两半，先后独立，⛔ 不要合成一个 PR 的一次判断

第一半（一行 + 一条自测例）： 在 family_reads 的 pm_dispatch_gates 分支里，紧邻现有 */.gitignore 臂加 *.sh) return 0 ;;。⚠️ 落地前重取行号 —— 本席读到时是 :320，但这张卡的历史就是行号会动。自测例要驱动那个窗口（packages/x/foo.sh 状态 M），不要只断言函数存在。

第二半（本卡自称的正题）： 把选择器的 key set 钉到门自己的 live read-set 上。卡给了两个形状且明说「⛔ 不是处方」：门自身导出 read-set，或一道校验器断言 key set 是其超集。卡指出前者是本仓对同一问题用过的形状（check:declared-population-live）—— 本席同意这是承接者应当先读的先例，但不裁定选哪个。

⚠️ 第一半落地不构成第二半已解决。承接者若只做第一半，请在卡上说明，卡留 pm:queue，不要关。

type = Bug

选择器自己声明的安全属性是「key set 绝不得窄于门的真实 read-set」。.sh 缺口正是这条已声明契约被违背 ⇒ Bug，而非 Task。第二半单独看是 Task 形状，但同卡从严取 Bug。

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