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技能卡：标签写前同动作内重读——陈旧快照整组回写陷阱行收紧（行中性） #9226
Description
出处（事故驱动）
cloud#1367 / #1380 / #1390：cloud 座位 14:25 按陈旧标签快照做 issue_write 整组回写，冲掉维护者 13:0x 的手工换标（无新评论）。决策评审 PM 已修复回 pm:queue 并留审计评论。已知「labels 整组替换」陷阱第 N 次发作。维护者批准本修复（2026-08-17：「同意」）。
机制缺口（为什么现行行文没防住）
- 现行行文「不先读现值合并再写」没钉「现值」的新鲜度——轮次早段的读数 + 80 分钟后的写，字面满足 read-then-union、语义被绕过。
- 写后回读抓不住这类事故：回读验证「写的 = 想写的」，陈旧意图写成功则回读全绿；回读防 sanitizer/label-bot 吞写，防不了冲掉他人更新的写。唯一有效防线是把读-写窗口压到秒级。
交付（单文件、单行、行中性）
references/platform-readings.md 中 issue_write labels 整组替换陷阱行原位改写（⛔ 不追加新行）：核心增量 =「写标签前同一动作内重读现值合并——隔轮/隔小时的旧读数视为无效快照」；保留既有要素（整组替换非追加、真追加走 REST POST /issues/{n}/labels、写后回读）。SKILL.md 写侧纪律已引事实表，⛔ 不动。
约束
- 行中性（文件现 133/134），⛔ 抬顶,⛔ re-wrap 筹行,⛔ 语义丢失。
- 硬串行：
platform-readings.md是 PR docs(pm): PM token discipline — seat-post throttling, targeted reads, dispatch-prompt slimming at net-zero lines #9207 的热文件——排其合并之后，基线必须含之。 - 条款①路径强制档位，
--tier推导引用；ADR 类 draft PR 挂起等维护者。 - cloud Routine prompt 的提醒句不在本卡范围（维护者 Routines UI 一行,已另行转达）。
Credit
事故诊断与修复处置：决策评审 PM;机制缺口分析与行文：skills 席。
Activity
os-zhuang commentedon Aug 17, 2026
Claim: session_017TNzEetykdh7ceZGwuAPLq
Branch: claude/issue-9226-label-write-reread
席位：skills 车道 PM，seat 自领（技能卡）。
排序：硬串行——
platform-readings.md是 PR #9207 热文件，待其合并后派发。档位：条款①路径强制（
.claude/skills/pm-dispatch/**）。Generated by Claude Code
os-zhuang commentedon Aug 17, 2026
范围补充（可选搭载，skills 席，2026-08-17）：维护者问询 opus 豁免开发 + fable 验证流程时暴露一处未落字项——条款②复审席资格双条件已成文，条款①（技能面 PR）的复核席本身须跑在契约复审档位仅是事实未是条款。本卡若行数允许，SKILL.md 复核段顺路补一句（档位引 dispatch-gates 常量，⛔ 不写模型名）；行中性自筹装不下则弃收本句并在 PR body 报告——主交付仍是 platform-readings 那一行，⛔ 不因搭载句挤占。搭载后本卡面 = SKILL.md + platform-readings.md，串行位置不变（两文件均为 PR #9207 热文件）。
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os-zhuang commentedon Aug 17, 2026
{ "issue": 9226, "status": "done", "branch": "claude/issue-9226-label-write-reread", "pr": "https://github.com/objectstack-ai/objectstack/pull/9238", "premise_still_valid": true, "summary": "Main deliverable landed: in-place, line-neutral rewrite of the issue_write labels trap line in platform-readings.md pinning read-freshness (same-action re-read; cross-round/hour readings are invalid snapshots), all pre-existing elements kept. Piggyback landed, not dropped: SKILL.md review section item 1 of the skill-surface ACCEPT triad now requires the clause-1 review seat to run at the contract-review tier via dispatch-gates constant CONTRACT_REVIEW_TIER, no model name. Draft PR, skill-surface: awaiting human merge, never ready/queue/auto-merge. skip-changeset applied via REST append and read back: documentation, size/xs, skip-changeset.", "files_changed": [".claude/skills/pm-dispatch/references/platform-readings.md", ".claude/skills/pm-dispatch/SKILL.md"], "line_budget": {".claude/skills/pm-dispatch/references/platform-readings.md": "133 -> 133 (ceiling 134)", ".claude/skills/pm-dispatch/SKILL.md": "682 -> 682 (ceiling 682)"}, "gates": "union re-run after final commit at 0627eed38: doc-authoring PASS; doc-formula-expressions PASS (after building @objectstack/lint dep closure); pm-skill-id-lint PASS; pm-skill-ratchet PASS; skill-frame-sync PASS; nul-bytes PASS. Families re-derived from actual changed paths via dispatch-gates.mjs; no additions beyond the derived set. Tier derivation MANDATORY claude-fable-5 (clause 1), quoted verbatim in PR body. CI on the draft PR: in_progress at report time (per 2026-08-10 ruling, convergence read is the review side's).", "deviations": "none — line-neutral held on both files (no ceiling raise, no re-wrap, no semantic loss); piggyback funded by extending an existing line (precedented: file has lines up to 492 chars)", "tests": "docs-only skill-surface change; verification = gate union above at 0627eed38", "open_questions": [], "out_of_scope_findings": [] }Generated by Claude Code
Generated by Claude Code
os-zhuang commentedon Aug 17, 2026
PM review — ACCEPT · awaiting a human merge
PR: #9238 (draft, ADR-class, hanging for the maintainer's manual merge). Final commit
0627eed38.Checklist: main deliverable exact to card — the
issue_writelabels trap line rewritten in place with freshness pinned (same-action re-read; cross-round/cross-hour readings = invalid snapshots), every pre-existing element retained (whole-set replace, REST append path, post-write read-back). Piggyback landed, not dropped: clause-① skill-surface review-seat tier added to ACCEPT-triad item ① viaCONTRACT_REVIEW_TIERconstant, no model name in prose. Line-neutral on both files (133/133, 682/682), 0 ceilings raised, no re-wrap. Gates green at final commit; tier derived clause ① via--tier, quoted in PR body.Spot-checks: diff read in full (2 hunks); no semantic loss, no ⛔ removed.
Deviations: none reported, none found.
Argumentation lives in the PR body; not restated here.
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docs(pm): label writes must re-read current labels in the same action…