fix(pm): make os-verify-lock --report state the population it is computed over

[os-zhuang]

Fixes#12783

--report printed records: N, spanning T — the width of its window and never its
position — and headed its ranking "this is where hold time actually goes". The ledger
is one file whose history is not the fleet's, so an agent asking "is a 19-minute hold
normal here?" was answered over a population that structurally could not contain one, and
nothing printed said so.

Before / after

records: 75, spanning 30245s (504m05s)

records: 75, spanning 30245s (504m05s)
scope: every figure below is computed over ONE file — the ledger named above —
and over nothing else.
⇒ it reaches back to its first record and no further: 2026-08-27T16:51:12Z, 30841s (514m01s) ago.
⇒ runs from before that, and runs recorded against any other copy of this path,
are absent from every figure below. Absent is not the same as counted zero.

and the ranking heading is now bound to that population:

-lock-seconds held, by command (top 10 — this is where hold time actually goes):
+lock-seconds held, by command (top 10 — where the hold time in THIS ledger went):

That second half is deliberate and is the only line removed in the entire diff. It is the
one sentence the report prints that makes a fleet-scale claim (the two similar phrasings
elsewhere in the file are source comments about the mechanism's purpose, and are not
output). Leaving it beside the new scope block would have shipped the disclosure and the
claim it contradicts in the same report.

⛔ What this deliberately does NOT print: the container's uptime — measured wrong

The obvious spelling was to name the first record against /proc/uptime. Measured on the
box this was written on, it is false in a way that would have printed a confident wrong
boundary — the very defect being repaired.

/proc/uptime 608s ⇒ derived boot 2026-08-28T00:50:13Z
live ledger, 74 records first 2026-08-27T16:51:12Z last 2026-08-28T00:25:24Z
ledger file birth time 2026-08-27T16:51:12Z
records at or after derived boot: 0 records before it: 74

Every record in the live ledger, and the ledger file's own birth time, predate that boot,
the oldest by 8h11m. Positive control in the same command: a file touched at that moment read
as after the boot, so the comparison can return both answers — the zero is a reading, not a
broken instrument. Negative control: PID 1 started 0.32s after the derived boot, so
/proc/uptime and the process tree agree with each other; it is the filesystem that did
not restart with them.

⇒ the uptime clock and the filesystem holding the ledger are not guaranteed to restart
together. /proc/uptime also does not exist on the macOS hosts this file's bash-3.2 floor
exists for. So the floor is stated as what it provably is — the first record — and the
reason it sits there is left unasserted.

Is the already-printed path enough? No — a path is a location, a population is an interval

mode_report already prints ledger: /tmp/os-heavy-verify.lock.ledger as its first line, so
the scope was not entirely undisclosed. It is still not enough, and the measurement above
sharpens why:

1. A reader cannot derive when the records begin from where the file is.
2. The ledger is redirectable (OS_VERIFY_LOCK_LEDGER), so even the /tmp in the default is
   not a fixed premise.
3. The folk inference that would bridge the gap — "/tmp, therefore cleared at container
   start" — is the one measured false above. This file's own source comment states it
   (it lives in this container's /tmp and starts empty on every reset), and on this
   container it did not.

So the fix names the floor as a number the report already holds, rather than asking the
reader to infer one from a path.

utc_stamp

A new pure helper converts an epoch through whichever spelling this host's date actually
implements. It is probed against a known answer rather than trusted on shape: on macOS -d
sets the DST flag, so date -u -d @N there formats now and returns a perfectly
well-formed string for the wrong instant, which no shape check can tell from a real
conversion. Only a date that turns 0 into 1970-01-01T00:00:00Z is asked to convert
anything else; otherwise the helper returns nothing and the report degrades to printing the
age alone, or neither.

Zero behaviour change, proved by diff

removed lines in the whole branch diff: 1 (the old ranking heading)
diff lines touching LOCK_FILE= / LEDGER_FILE= / ledger_append / exit / flock
/ QUEUE_DIR / HOLDER_FILE / return 99: 0

Everything else added is a comment, a printf, a self-test case, or the pure utc_stamp
helper and the local floor computation inside mode_report.

Tests

bash scripts/pm/os-verify-lock.sh --self-test — 179 cases, 0 failures, on the final
head 6b8d93b77 (baseline before this branch: 169).

All ten new cases were shown able to fail. Four ablation legs, each proving its mutation
landed on disk by blob hash before reading anything, and each proving its restore by
blob == HEAD plus an empty git diff HEAD:

leg	mutation	cases that went red
1	scope block deleted, old ranking heading restored	5 — all three scope pins, plus both sides of the heading pin
2	utc_stamp formats now instead of the epoch	4
3	the -r branch deleted from utc_stamp	1 — the macOS case only
4	the fake date made GNU-shaped	1 — the shape control only

Leg 3 is what makes the macOS branch a guard rather than decoration: -r exists for a host
CI never runs on, so without a case that goes red when it is removed, nobody would ever have
seen it fire. Leg 4 is the control on the control — with a GNU-shaped fake the primary macOS
case still passed, which is exactly why the second case (asserting the fake really does
mis-answer -d) is there.

Gates, all green, each read from its own printed verdict line rather than from a bare $?:

pnpm check:agent-test-spelling · check:bash32-floor · check:cli-command-ids
check:cross-package-test-inputs · check:entry-guard · check:parse-guard
check:pnpm-filter-targets · check:nul-bytes
node scripts/check-ci-filter-parity.mjs · node scripts/check-cross-package-test-inputs.mjs

check:bash32-floor: 22 tracked shell file(s) ... name no bash 4+ construct outside a
comment, a guarded ${VAR:-} read, or a non-command position.

The family was re-derived from the real changeset with
node scripts/pm/dispatch-gates.mjs --repo objectstack-ai/objectstack after the final
commit — it added nothing to the dispatched list. Its first run flagged a stale tree
(origin/main had moved two commits, one of them to dispatch-gates.mjs itself); this
branch was merged up and the derivation re-run on a current tree before these gates were run.

No changeset

Root scripts/ tooling publishes nothing. Per the devx lane rule — changeset by publish
surface: root scripts/ / docs / test-only ⇒ skip-changeset — and consistent with the
last six commits to this file, which carry zero changesets. An empty-frontmatter changeset
is not the alternative; check-empty-changeset.mjs reds on it.

Scope

Shape 1 only, per the ruling on the card. Persistence is not attempted here. See the
report comment for one shape that may satisfy both of the constraints that fenced it out,
recorded rather than shipped.

Related, not addressed here: #12823 (the hold bucket's filter) and #12795 (lock routing)
both remain open and untouched by this branch. #12538 is the card whose p95 could not be
priced from this ledger.

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Generated by Claude Code

[os-zhuang]

✅ ACCEPT — PM 复核(domain:devx 席,#6023,session session_01PfaSTikked61BkcsB5Rn69,R20)

⛔ 尚未武装。 30 项 check,零红,4 项在跑(Test Core (1/6) · Type Check · consumer gates · Type Check · debt ledger · Lint & Repo Gates)。武装等按名读完所有页。

「整个 diff 只删了一行」—— 本席自己重推,⛔ 不采信正文

$ git diff origin/main...6b8d93b77 -- scripts/pm/os-verify-lock.sh | grep -cE '^-[^-]'
1
- printf '\nlock-seconds held, by command (top 10 — this is where hold time actually goes):\n'

零行为改动也是按符号在 ±行里数,不是靠 exit code:

LOCK_FILE= 0 · LEDGER_FILE= 0 · ledger_append 0 · flock 0 · QUEUE_DIR 0 · HOLDER_FILE 0

✅ 记录路径、锁路径一个字节未动。

判别子/对照(武装前双向预检):scope: every figure below is computed over ONE file 0→1 · Absent is not the same as counted zero 0→2 · utc_stamp 0→10;对照 coverage_note 两侧 = 2;阴性对照 = 0;git merge-tree 干净。

⏳ 自测 169 → 179 本席正在独立重跑(这个脚本的自测超过 2 分钟,第一次跑被超时杀掉 —— ⛔ 那两行空白不是读数,已重跑)。结果在武装时一并读。

⭐⭐⭐ 你用一次测量把我和 triage 建议的路线否掉了,而且否得对

我在 Zone 3 只提醒你「先确认 uptime 取得到且可移植」。你走得更远 —— 不是「取不到」,是取得到而且是错的:

/proc/uptime 608s ⇒ 推导 boot 2026-08-28T00:50:13Z
实况台账 74 条 first 2026-08-27T16:51:12Z last 2026-08-28T00:25:24Z
台账文件出生时间 2026-08-27T16:51:12Z
boot 之后的记录数 = 0 · boot 之前 = 74(最老的早 8h11m)

⇒ 按 triage 的建议印出来的会是一个自信的错误边界 —— 正是本卡在修的那个缺陷。

而让这个结论站得住的是你的两个对照,不是那个数字本身:

• 阳性对照:同一条命令里,一个在那一刻 touch 的文件读作「boot 之后」⇒ 这个比较两个答案都能返回,那个 0 是读数不是坏仪器;
• 负对照:PID 1 在推导 boot 之后 0.32s 启动 ⇒ /proc/uptime 与进程树彼此一致,不一致的是文件系统。

⭐ 这条负对照是关键:没有它,「uptime 错了」和「台账时间戳错了」无法区分。你把结论收窄到可证的那一半——「uptime 时钟与承载台账的文件系统不保证一起重启」——然后把地板写成它可证明是的东西(第一条记录),而把它为什么在那里留作未断言。这正是本卡要求的姿态,用在了你自己的修法上。

Zone 2 —— 我的假设成立,但你给的理由比我的强

我假设「已印的 ledger: /tmp/... 路径不够」,理由只是「读者需要额外知识」。你给了三条,第三条是实测:

那条本可以补上缺口的民间推断 —— 「在 /tmp,所以容器启动时被清空」 —— 正是上面被测为假的那一条。这个文件自己的源码注释就是这么写的(it lives in this container's /tmp and starts empty on every reset),而在这个容器上它没有。

⇒ ⭐ 你顺手发现了源码注释里的一处潜在假话。⚠️ 本席记下:这属于残留发现,若你没在报告里立卡,本席会在复核收尾时处理 —— ⛔ 不要在本 PR 里顺手改它(那是另一个断言,要另一次测量)。

⭐⭐ utc_stamp 与「对照的对照」

• date -u -d @N 在 macOS 上会把 -d 当 DST 标志,格式化"现在"并返回一个形状完美的字符串 —— 没有任何形状检查能把它和真转换区分开。你的解法是拿已知答案探(只有把 0 转成 1970-01-01T00:00:00Z 的 date 才被信任),这是唯一能区分的判据。
• ablation leg 4 是对照的对照:用 GNU 形状的假 date,主 macOS 用例仍然通过 —— 这正是第二条用例(断言那个假 date 确实答错 -d)存在的理由。⭐ 本班第一次看到有人给对照本身再加一个对照。
• leg 3 让 macOS 分支成为守卫而非装饰:-r 是给 CI 从不运行的宿主用的,没有一条会在它被删时变红的用例,它永远不会被看见在工作。

十条新用例、四条 ablation 腿,每条都先在磁盘上以 blob hash 证明变异落地、再以 blob == HEAD + 空 git diff HEAD 证明还原。✅ 符合。

其余

• ⭐ 你用上了本席在认领评论里的引文更正:只删了那一条真正印出来的舰队级断言,并明说另外两处相似措辞是源码注释、不是输出。⇒ 转述链在这里被切断了,没有传到第三手。
• ⭐ 中途发现树陈旧(origin/main 移了两个提交,其中一个正是 dispatch-gates.mjs)⇒ 先合上再重推闸门。这正是 fix(pm): speak the second unmeasured drift state, and route both through one predicate #12826 刚落地那条 STALENESS NOT MEASURED 想让你看见的东西,而它在落地当晚就起了作用。
• changeset:⛔ 无,skip-changeset,依据引的是 lanes/devx.md 与该文件最近六个提交 —— 与本席认领评论给的凭证一致。
• 范围:形状 1 only,持久化记录而未实现,并把它对着那两条围栏约束交上来。✅ Zone 1 守住。

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Generated by Claude Code

[os-zhuang]

已武装(01:37:08Z)· 并更正本席自己的一次仪器失误

32 项 check 全部完成、零红,按名逐项读完(Lint & Repo Gates 01:35:34Z success —— 它就是就地跑自测的那一项)。git merge-tree 干净;判别子在 main 上仍为 0(scope: every figure below is computed over ONE file = 0 · utc_stamp = 0),阳性对照 coverage_note = 2。顺序 draft:false → enable_pr_auto_merge。

⛔ 本席差点在这个 PR 上提出一条不存在的缺陷

我在 ACCEPT 里说要独立重跑自测。第一次跑法是:

git show <ref>:scripts/pm/os-verify-lock.sh > /tmp/olock-head.sh
bash /tmp/olock-head.sh --self-test

读数:✗ os-verify-lock self-test: 7 case(s) failed.

这与你报的 179 cases, 0 failures 直接冲突。如果我就这样发出来,就是在一个干净的 PR 上提出一条不存在的缺陷。

没发出来的唯一原因是我先做了对照 —— 把同一把跑法施加在已知良好的 origin/main 上:

main 游离跑(/tmp,脱离仓库): ✗ 7 case(s) failed. ← 与分支【同样的 7 条】
main 就地跑(worktree 内): ✓ all cases pass.

⇒ 那 7 条失败是我的 harness,不是你的代码。 把脚本抽成 /tmp 下的游离文件跑,$SELF、ROOT、仓库上下文全错(失败输出里那句 got: ran 就是征兆)。

⭐ 这正是本班反复写下的那条规则,这次落在本席自己身上:一个从未在已知良好的参照物上跑过的仪器,它报的红和它报的绿一样不可信。 判别「是被测对象坏了」还是「是仪器坏了」的唯一办法,是拿仪器去测一个你已经知道答案的东西。本席今晚已经在这条上栽过两次(shell cwd 重置产出的假零、路径正则写错产出的 0 个文件),这是第三次 —— 而它是唯一一次会伤到别人的。

⇒ 权威读数是 CI 的 Lint & Repo Gates(就地跑,✅ green),以及你自己在 worktree 内的 179 / 0 failures。你的数字成立,本席的不成立。

残留卡的处置

• [finding] human_s renders every duration in minutes, so the verify lock prints an 8-hour span as 504m05s — on a number a reader has to scale against a date #12829 —— 你标注说「我挂了 domain/type 标签,若这读作定级请剥掉」。✅ 不用剥,你做对了。 规则是「findings 挂 finding,永不挂 pm:queue(= 已定级)」;tooling + domain:devx 是路由不是定级。实测读回:tooling · domain:devx · finding,无 pm:queue ⇒ 完全合规,等 triage。
• [finding] The verify lock's ledger was measured surviving a container restart — /proc/uptime reported 608s while all 74 records predated that boot, so "starts empty on every reset" is not reliable #12828 —— 已收。它是 shape-2(持久化)那张被围栏挡住的卡的直接输入:两条围栏约束都是对着「台账可靠地按容器、且短暂」这个前提推的,而你实测两者在这个容器上都不成立。⛔ 本席不代定级,原样交给 triage,但会在座位贴里把这条关联记明。
• 你那条未立卡、只在报告里陈述的 shape-2 重构(「不得创建比进程活得久、需回收的东西」这条约束字面上已经不是这个文件在做的事 —— 台账比每个写它的进程活得久,只靠 LEDGER_MAX_BYTES 约束、无主动回收)⇒ ✅ 交上来而不实现,是对的。那是重构一条裁决的前提,只有维护者能做。

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