docs(pm): fold the SKILL.md serial chain — lane consolidation, lane job descriptions, request cards, foreign-gate parking, family dispatch

[os-warren]

Fixes#9854
Fixes#9871
Fixes#9852
Fixes#9776
Fixes#9663

Family dispatch — five ruled cards, one branch, per-card commits. First live run of the mechanism that the fifth member itself legalizes (maintainer fold order, verbatim: 「开始折叠派发」; fold authority: 「SKILL.md 串行链 为什么不能合并成一个卡伐」). Every member carries a claim comment naming this branch; each lands as its own commit. Governed surface — this PR stays draft; the maintainer merges.

Per-commit map (commit order = member order)

commit	card	delivers
3f64a39	9854	Domain-lane table merge: engine-core + metadata + drivers rows collapse into one domain:engine row (package families verbatim; the 2026-08-05 investment-freeze note rides its packages); identity's four plugins fold into the domain:services row; the four retired labels are marked retired IN the table (label objects stay). Companion roster sync in scripts/pm/ensure-pm-labels.sh — its own header mandates "keep both in sync BY PR whenever a lane is added or retired", and it records that domain:engine re-enters circulation after its own earlier retirement. Stale-lane-name sweep: one hit (the metadata-from-engine-core secondary-split sentence in the spec intra-seat reference) rewritten; .claude/agents/os-dev.md and all other pm-dispatch references: zero hits.
c7683ca	9871	Six lane job descriptions in references/lanes/ (engine, services, cli, devx, skills, spec), each 范围 + 常设承诺 + 席内判断, migrated from the live seat posts' prose, self-contained (id-lint auto-covers them). Seat-post template shrinks 6 → 4 sections in SKILL.md 座位贴协议 and references/seat-post-protocol.md; a post points at its lane file; live seat-post bodies deliberately untouched (migration is seat work). CEILINGS entries at landed counts + a self-test case.
22ba7c2	9852	Request-card protocol on the 跨座位转移 clause: a cross-seat ask of any kind (a reading, a card-opening obligation, an access need) is work and lands as a card in the target lane's queue with provenance + a one-line executable criterion; a seat-post knock or ruling comment is never the only carrier; the waiting card flips pm:blocked + Blocked-by: at the request card in the same stroke; unreachable target repo routes via the seam-card rule (repo: label + named reader). No new labels, no new sweep.
684466c	9776	Done-but-unlandable state, on the pm:blocked row directly adjacent to the 放行双查 discharge rules: no new label; Blocked-by: at the gate card plus a machine-readable Unlock-action: re-check PR body line that swaps the unlock action from re-queue-for-work to re-check-the-PR; the re-queue premise check treats an existing finished open PR as landing work; the parked PR must name the gate card in its own body.
7371c47	9663	批次独立性 absorbs the family-dispatch scope clarification: one dev covering N same-region ruled cards satisfies the independence invariant trivially; admission = the five gates as filed (gate 3 — every member already ruled, none in the decision box — and gate 5 — the named exclusion list — are load-bearing); fold-or-serial is a mandatory question whenever 2+ queued cards share a hot file, with the maintainer's verbatim 「你自己定的工作方式你也会忘。」 in the clause; the folded-claim conventions (shared branch named in every member claim, per-card commits, multi-Fixes PR body, lead claim carries the serial-constraints check) land in the claim protocol, written from this dispatch's own record.

Ratchet economics — one coherent pass funds all five additions

file	before	after	ceiling
.claude/skills/pm-dispatch/SKILL.md	682	682	682 (headroom 0)
references/seat-post-protocol.md	101	101	101
references/lanes/engine.md	new	41	41
references/lanes/services.md	new	31	31
references/lanes/cli.md	new	37	37
references/lanes/devx.md	new	38	38
references/lanes/skills.md	new	36	36
references/lanes/spec.md	new	44	44

Payments, all genuine dedup/relocation — no re-wrap of existing content: table 5 rows → 2 (-3); spec intra-seat reference relocated to lanes/spec.md (-8 incl. its stale sentence); the spec-only fixture-triage dispatch rule relocated to lanes/spec.md as its home (-3); the platform-readings TOC enumeration and the ccusage tool description collapse to pointers at the facts table that already carries them, verified against its actual headings (-2); the seat-post migration detail defers to seat-post-protocol.md (-1). Additions: request-card clause (+5), family-dispatch clause (+8 at the file's native line density — new text, not re-wrapped existing text), lane-file pointer in 座位贴协议 (+2), foreign-gate rule (+0, extends the pm:blocked table row, which is a single line by markdown table syntax). One extension rides an existing claim-protocol line (folded-claim conventions appended where the branch-naming rule already lives).

Gates — union run at head 7371c47, after the final commit

Derived by node scripts/pm/dispatch-gates.mjs (no paths — script took the changeset from merge-base): 9 matched families. All green, exit codes captured before any pipe:

• pnpm check:pm-skill-ratchet — "✓ … SKILL.md is 682 lines (ceiling 682; headroom 0)" + all six lane files at headroom 0, self-test 14 cases
• pnpm check:pm-skill-id-lint — "✓ check-skill-id-lint: 15 file(s) clean" (the six lane files are inside the scan set)
• pnpm check:doc-authoring — "✓ doc authoring guard: 377 files clean"
• pnpm check:skill-frame-sync — "binding sentence present in all 4; 4 count mention(s) agree"
• pnpm check:pm-governed-prose — "✓ … 2 instruction surface(s) name all 5 registered governed surfaces"
• pnpm check:pm-governed-merges — self-test 77 assertions
• pnpm check:cross-package-test-inputs / node scripts/check-cross-package-test-inputs.mjs — "OK: 12 package(s) … all declared"
• pnpm --filter @objectstack/lint run check:doc-formula-expressions — "✓ … 22 record-scoped formula example(s) … judged clean" (first run was the classic unbuilt-dist prerequisite in a fresh worktree; green after building the lint dependency closure)
• pnpm check:nul-bytes — "OK (scanned 6288 text file(s) … no raw ASCII control bytes)"

Notes for the merging maintainer

• Seat work after merge (recorded on the lead card, not this PR's): label rename engine-core → engine (measured: no leftover domain:engine label object exists, get_label 404 — the rename path is clear), 44-card migration, seat-post consolidation + per-seat 4-section shrink, bash scripts/pm/ensure-pm-labels.sh rerun.
• scripts/pm/check-half-states.mjs self-test fixtures use the literal domain:engine-core as an arbitrary label string; they assert nothing about the lane vocabulary and were left untouched (judged inert, reported here).
• One migrated-prose conflict was resolved in SKILL.md's favor: the devx seat post records flipping governed ADR PRs ready-for-review so the merge button works, while SKILL.md's ACCEPT-path fork says such PRs are never flipped ready. The devx lane file follows SKILL.md (恒 draft、留维护者); flagged in the dev report for the skills seat to reconcile.
• skip-changeset applied: the diff is .claude/skills/** + scripts/pm/** only — nothing published.

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