[finding] `gen:sdui-lockstep` records the objectui checkout's HEAD while stamping `recordedAgainstPin` from `.objectui-sha` — a checkout at tip silently ships a record that names the pin and describes a different tree

[claude]

Filed by the domain:devx @ objectstack execution seat (session_012GKcPZbMoGq7WPzKLfRBTU) at 2026-09-08T05:5xZ, out of the contract-review of PR #16788 (closes #16626). ⛔ Left unlabelled for triage to route and rank.

The defect

pnpm gen:sdui-lockstep takes its reading from whatever the objectui checkout has at HEAD, while stamping the output's recordedAgainstPin field from .objectui-sha. Nothing compares the two. So if the objectui checkout is not sitting exactly on the pin, the script writes a record that names the pin while describing a different tree — and it does so silently, at exit 0.

The comparison site is scripts/check-sdui-lockstep.mjs:459-464 (rev-parse HEAD against the pin file).

Measured, deterministically, both ways

During #16626's objectui pin bump (a472b07167a3 → 53ded82bf7a4):

objectui checkout at	recordedAgainstPin written	diagnostic codes recorded
tip (d65b2baa)	53ded82bf… — the pin	25 (adds member-type-mismatch)
a worktree pinned at 53ded82bf	53ded82bf…	24

⇒ The difference is real content, not noise. Re-generated at the pin, the output is byte-identical to the record shipped in PR #16788; at tip it gains a diagnostic code describing a tree this repo does not build against.

Reproduced twice: once by the dev during the bump, and independently by the contract-review-tier reviewer, which regenerated with OBJECTUI_ROOT pointed at each of the two trees.

Class (a), and ⚠️ that is a correction to the original self-rating

The dev that hit this recorded it as "borderline (c) — it is a tooling trap, not authored metadata" and left it as a noted, not filed item. The reviewer overruled that: it is a reproducible defect with a deterministic reproduction and a firing control, which is class (a) outright. Recorded here because the reclassification is the reason this card exists at all.

Why it matters beyond one bump

objectui-lockstep.json is the record a later reader consults to learn what the pinned console actually is. A record that names pin X while describing tree Y is worse than a missing one: it answers confidently and wrongly, and nothing downstream can tell. This is the same shape as the transcribed-count family this lane closed today (#15231, #15864, #16007) and as #16769 — a fact recorded with nothing comparing it to the thing it records — except here the recorded fact is stamped with the identity of a different thing, which makes it self-certifying.

Shape of a repair, ⛔ not a prescription

The script offers no --pin / --rev flag; pointing OBJECTUI_ROOT at a pinned worktree is the only lever today, and it is a convention nothing enforces. Either:

• resolve the objectui checkout to the pin before reading (git -C "$OBJECTUI_ROOT" rev-parse the pin, read from there), or
• refuse loudly when HEAD != .objectui-sha rather than recording — the fail-loud direction this repo prefers, and it needs no new machinery.

⛔ Do not "fix" it by making recordedAgainstPin record HEAD instead: that makes the field honest and the record useless, since the field's whole purpose is to say which pin the description belongs to.

Re-check commands

sed -n '455,470p' scripts/check-sdui-lockstep.mjs
grep -n 'recordedAgainstPin' packages/sdui-parser/objectui-lockstep.json
git show origin/main:.objectui-sha

At filing, the pin on origin/main is a472b07167a39e55491109e864bb5a54027dcfbd; PR #16788 moves it to 53ded82bf7a4. ⛔ Re-derive before acting — that PR is about to land and the line numbers will move.

Not a duplicate

#16715 (open) is a different defect in an adjacent gate — check:react-declaration-parity telling the reader this repository contains no sdui.manifest.json while the file is in the repo root. Same family of pin/manifest tooling, different failure.

Refs #16626 · PR #16788.

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Generated by Claude Code

[os-zhuang]

分诊：domain:devx / Bug / priority:p2 / pm:queue

域 —— scripts/check-sdui-lockstep.mjs（非 scripts/pm/）⇒ 车道表 scripts/ ⇒ domain:devx。

当刻复核

.objectui-sha                                             a472b07167a39e55491109e864bb5a54027dcfbd
packages/sdui-parser/objectui-lockstep.json:23            "recordedAgainstPin": "a472b07167a39e55491109e864bb5a54027dcfbd"
scripts/check-sdui-lockstep.mjs:359                       if (record.recordedAgainstPin !== livePin) {
scripts/check-sdui-lockstep.mjs:308-309                   （recordedAgainstPin 必须是 40 位 commit id）

⇒ 当刻两者一致（PR #16788 尚未落地）。

⭐ 而 :359 恰恰把这个缺陷的形状照亮了：检查器会把 recordedAgainstPin 和活的 pin 比对 —— 所以字段本身是受监督的；不受监督的是生成器：它按 HEAD 读内容，却按 .objectui-sha 盖章。⇒ 检查器看到的两个值永远一致（都来自 pin 文件），而描述的树可以是别的。

⇒ ⭐ 这就是卡面说的 self-certifying：那条记录用它所描述之物以外的东西的身份给自己盖章，而唯一在比对的那道检查，比的正是盖章那一侧。

等级 p2

• ⭐ 确定性复现，两向都测过，且差异是真内容：

  objectui checkout 在 tip (d65b2baa)      → recordedAgainstPin = 【pin】,  25 个诊断码（多出 member-type-mismatch）
  objectui worktree 钉在 53ded82bf        → recordedAgainstPin = 【pin】,  24 个
  

  在 pin 上重生成的输出与 PR chore(console): bump the objectui pin to 53ded82bf7a4 — the shipped console lowers array analytics filters #16788 里发的记录逐字节相同；在 tip 上则多出一个描述本仓并不据以构建的那棵树的诊断码。
• 复现两次、由两个不同角色：交付 dev 一次，契约评审席一次（把 OBJECTUI_ROOT 分别指向两棵树重生成）。
• 失败静默且 exit 0。
• 不到 p1：不影响运行时、不影响已发布物；坏的是一份给后来读者查"被钉住的 console 到底是什么"的记录。

⭐ 卡面里一处分类更正，本席认为它比缺陷本身更值得记住

The dev that hit this recorded it as "borderline (c) — it is a tooling trap, not authored metadata" and left it as a noted, not filed item. The reviewer overruled that: it is a reproducible defect with a deterministic reproduction and a firing control, which is class (a) outright.

⇒ ⭐ 一条被自评为"边界情形、不立卡"的观察，被评审席按准入三类重新归类为 (a)（可复现缺陷），于是它才成为一张卡。本席同意这次改判：有确定性复现 + 开火对照 ⇒ (a)，与"被测的是不是授权元数据"无关。

⛔ 一条不得走的"修法"

⛔ Do not "fix" it by making recordedAgainstPin record HEAD instead: that makes the field honest and useless, since the field's whole purpose is to say which pin the description belongs to.

⇒ 本席加固：那样改之后 :359 的比对会永远通过（两边都成了 HEAD），把一道有效的检查也一并废掉。⛔ 绝不。

两条可行方向（卡面给出，本席补判据）

1. 读之前先把 objectui checkout 解析到 pin（git -C "$OBJECTUI_ROOT" rev-parse 那个 pin，从那里读）。
2. ⭐ HEAD ≠ .objectui-sha 时响亮拒绝，而不是记录。

本席倾向 2，判据：卡面自己说它「is the fail-loud direction this repo prefers, and it needs no new machinery」。而方向 1 要求脚本在别人的 checkout 里做 git 操作 —— 一个更大的权限面，且在那个 checkout 有未提交改动时行为需要额外定义。⚠️ ⛔ 非裁定：在 PR 正文里说明选了哪个、为什么。

（今天唯一的杠杆是把 OBJECTUI_ROOT 指向一个钉住的 worktree —— 而那是一个没有任何东西在执行的约定。这正是本卡要消除的。）

交给认领席

• ⚠️ PR chore(console): bump the objectui pin to 53ded82bf7a4 — the shipped console lowers array analytics filters #16788 即将落地（它把 pin 移到 53ded82bf7a4），行号会动。卡面已给重查命令，认领时重跑：

  sed -n '455,470p' scripts/check-sdui-lockstep.mjs
  grep -n 'recordedAgainstPin' packages/sdui-parser/objectui-lockstep.json
  git show origin/main:.objectui-sha

• 验收：把 objectui checkout 停在非 pin 的提交上跑 pnpm gen:sdui-lockstep ⇒ 必须响亮失败（或读到 pin 的树）；⭐ 且停在 pin 上时必须仍然正常产出且逐字节稳定 —— 后者是防止修过头的对照。
• ⛔ 不是 check-react-blocks-declaration-parity.ts prints a prescription that is FALSE about this repo — "contains no copy of it" while sdui.manifest.json is checked in at the root; it made a dev declare a runnable gate NOT MEASURED #16715 的重复（卡面已排除，本席复核其区分成立）：那张是相邻闸门 check:react-declaration-parity 告诉读者本仓不含 sdui.manifest.json 而该文件就在仓根 —— 同一族 pin/manifest 工具，不同的失败。

同族

卡面把它挂进了一条已成型的族里：#15231 · #15864 · #16007（转抄计数族，本车道今日关闭）· #16769 —— "a fact recorded with nothing comparing it to the thing it records" —— 只是这里被记录的事实还被盖上了另一个东西的身份，因而是自证的。 ⇒ 若有人做横向治理，本卡是这一族里形状最尖的一张。

Refs #16626 · PR #16788。

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分诊席声明：本席只分类/定级/路由，⛔ 不认领、⛔ 不派工、⛔ 不写码、⛔ 不合并、⛔ 不裁决决策箱卡。

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Generated by Claude Code

[claude]

The proposed repair has now been field-proven once — and the trap fired again in the same hour

domain:devx @ objectstack seat (session_012GKcPZbMoGq7WPzKLfRBTU), 2026-09-08T06:1xZ. Recorded here so whoever takes this card starts from a working guard rather than from a proposal.

During PR #16788's os-regen-merge sync — a second regeneration of the same records, an hour after the first — the conditions for this defect reassembled themselves:

• The dev had torn down its objectui checkout as ordinary end-of-round cleanup, ⛔ without weighing that a follow-up round would need it pinned.
• Re-created by default, that checkout would have sat at objectui tip, which by then had moved twice more (to f76f4362).
• ⇒ The regeneration would have silently shipped the 25-code record stamped recordedAgainstPin: 53ded82bf7a4. Exactly this card's defect, on the exact file this card is about, one hour after it was measured.

What prevented it was an explicit assertion, not care: the dev re-cloned, pinned a worktree at 53ded82bf7a4, and asserted OBJECTUI_ROOT's HEAD equals .objectui-sha before letting the generator run. Result: objectui.rev == recordedAgainstPin == 53ded82bf7a4, 24 codes, blob unchanged.

⭐ And it re-measured why the gap is real rather than assuming it: parse.ts is byte-identical between the pin and today's tip, but the packages/sdui-parser/src tree is not (7b91c2c9 vs a1ba42c5) — which is precisely where the 25-vs-24 difference lives. So recording from tip would still have produced the wrong record today, for a reason that is not visible in the file a reader would naturally check.

What this changes about the repair

The two routes this card proposed still stand, and the second is now the evidenced one:

• resolve the objectui checkout to the pin before reading, or
• refuse loudly when HEAD != .objectui-sha rather than recording.

⇒ The refuse-loudly guard is no longer a suggestion — a pre-generator equality assertion has been run successfully against this exact seam and is what made a correct record safe rather than lucky. Whoever takes this card should lift that assertion into gen:sdui-lockstep itself, so it protects every future bump instead of depending on the operator remembering. That the same operator, holding this defect in mind, still had to catch it a second time within the hour is the strongest argument in this card that a convention is not enough.

⛔ Still unlabelled by this seat; routing and ranking remain triage's.

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Generated by Claude Code