feat(pm-dispatch): four 2026-08-13 scheduling rulings — pm:blocking cache, computed pull order, urgent fable triage, simple cross-lane takeover

[hotlong]

Fixes#8433

Implements the maintainer's four 2026-08-13 scheduling-policy opinions (quoted verbatim, untranslated, in references/dispatch-runbook.md; date-tagged skeleton lines in SKILL.md). ADR-class merge path: this stays a draft for the maintainer's hand-merge — no auto-merge, no queue, no ready-flip by any AI seat.

What each item became

1. pm:blocking stored label (State model row + 标签纪律 bullet + seed in scripts/pm/ensure-pm-labels.sh): a sweep-maintained cache of the Blocked-by: reverse index — written/removed only by the triage sweep, off when every dependent closes, never hand-set. The 2026-08-11 sentence 「被依赖」是随上游关单衰变的推导属性…⛔ 不落存储标签 is superseded and was reconciled in both places it lived (标签纪律 bullet, line ~96; the old ordering sentence, line ~340): the text now records the 2026-08-11 → 2026-08-13 supersession with dates, and keeps the invariant a label exists iff it has a named reader (readers: the pull order, list-page scans). The seed follows the script's convention: a comment naming the consumers + a description under GitHub's 100-char limit.
2. Computed total pull order (选择优先级 rewrite): priority:p0 insert-ahead, then pm:blocking (within-tier by unlock fanout, still computed live — the fanout count stays label-free), then target: board items, then type Bug, then the rest; card age breaks ties at every tier. Reconciled with the recorded P1–P5 rejection: what was rejected is hand-maintained gradation values; every tier here reads an existing signal (label, native type field, created_at) with zero per-card maintenance.
3. Urgent direct triage (Backlog sweep skeleton + runbook section): maintainer-named or p0-suspect card ⇒ the seat immediately spins up a claude-fable-5 triage subagent instead of waiting for the triage Routine's shift cadence; authority surface is triage only (no code, no claim, no dispatch); output lands on the card, same format and force as Routine triage.
4. Simple cross-lane blocker takeover (批次独立性 skeleton + runbook section): a mechanical, clear-spec, S-class blocker in another lane may be taken over directly by the blocked seat — full claim discipline on the other lane's card, hot-file serial queue respected, completion note left; design-judgment work stays with the owning lane.

Interpretation points flagged for review (veto per item as ruled on the card)

• pm:blocking ahead of type Bug is the PM's reading, not the maintainer's words — the single ordering choice most likely to be flipped at review.
• target: board items kept as a tier (between pm:blocking and Bug): the card's four-tier order did not name the release board; silently deleting its queue effect had no ruling behind it, so it was retained. Flip or drop at review if the four-tier order was meant to be exhaustive.
• Item 3's single-producer sentence (yield when the triage seat is on shift and already on that card — same boundary as 代扫) is an operationalization from the existing 代扫 rule, not the ruling's words.
• Item 4 keeps two standing absolutes explicit in the runbook: packages/spec remains the spec seat's regardless, and the takeover is dependency-shaped, not a return of 借调 (load-shaped secondment stays deleted).

Region note

Declared surface was SKILL.md queue/triage/dispatch + 标签纪律 sections, the runbook, and ensure-pm-labels.sh. Item 4 falsifies three standing "only/never" phrases outside those sections; leaving them would ship a self-contradicting skill, so three surgical, same-line-count reconciliations were made and are called out here rather than done silently: 跨座位转移 (多仓协调) gains the takeover as its named sole exemption; 跨域例外路径 (Domain lanes) heading now names two boundary channels; Guardrails' lane-claim clause now reads 例外两条. None of the reserved regions (Model tiering, 发现分诊轮, 落卡/升级流程, references/seat-post-protocol.md, platform-readings.md, review-checklist.md) was touched.

SKILL.md line accounting (686/686 shrink-only ratchet → now 685, ceiling untouched)

Additions (+6):

• +1 State model row for pm:blocking
• +1 标签纪律 Blocked-by: bullet (4→5) — supersession record + cache semantics
• +2 Backlog sweep paragraph — item 3 skeleton
• +2 批次独立性 paragraph — item 4 skeleton

Removals (−7), each deferring detail to where it already lives verbatim:

• −1 状态变更不过夜 bullet (5→4) — checker command deferred to the 机械守卫索引 table
• −2 一次性建标签 (3→1) — retired-lane rationale deferred to the script header (its stated authority)
• −1 三分区 bullet (3→2) — full partition semantics live in the runbook
• −2 云卡四课/接手中断 (7→5) — the four takeover increments live in the runbook
• −1 直接验收兜底 bullet (4→3) — per-file checklist lives in the runbook

Constant-line rewrites: 选择优先级 7→7, 跨座位转移 3→3, 跨域例外路径 4→4, Guardrails bullet 5→5. Net −1; the 1-line headroom is left for the serialized cards behind this one (the fable-exemption card must add Model-tiering text).

Verification

Gate list re-derived from the actual changed paths with node scripts/pm/dispatch-gates.mjs — it returned exactly the six families named in the dispatch, no additions. All six pass locally (true exit codes captured):

• check:doc-authoring ✓ (376 files clean)
• @objectstack/lint check:doc-formula-expressions ✓ (after building the lint package's dependency closure — first run was the known fresh-worktree false red on missing formula dist/)
• check:nul-bytes ✓ (7630 files, no raw control bytes)
• check:pm-skill-id-lint ✓ (9 files clean — no issue-ID citations added to skill text)
• check:pm-skill-ratchet ✓ (685 lines, ceiling 686, headroom 1)
• check:skill-frame-sync ✓ (4 decision-frame copies isomorphic; none of my edits touch its anchors)

No changeset: nothing published releases from .claude/** or scripts/pm/** — skip-changeset applies.

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Project	Deployment	Actions	Updated (UTC)
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