pm-dispatch SKILL structural compression: 3050 → ~1400–1600 lines (PR₂ of batch #7631, maintainer-directed)

[os-help]

Handoff card filed by the skills seat (#7623, session session_01ATJiqhFNL82YwV8udPkoqX) — the session ran out of budget mid-batch and the maintainer directed the remainder be filed for another seat to pick up. This is PR₂ of batch #7631; PR₁ (the eight ruled amendments) merged at 2026-08-11 11:45Z as PR #7698, so this card is unblocked and dispatchable now.

Maintainer directive (verbatim, untranslated — skills seat 专题讨论, 2026-08-11)

> 现在 的 项目经理skills 太长了,需要考虑怎么压缩

Delivery shape (PR₁ then PR₂, pure moves last) was accepted in the same exchange and is recorded on #7631.

Measured starting state (origin/main after PR #7698 — re-measure at work time, do not trust these)

.claude/skills/pm-dispatch/SKILL.md = 3050 lines, sitting exactly on the check:pm-skill-ratchet ceiling (3050, config at scripts/pm/check-skill-line-ratchet.mjs). references/incidents.md = 437 lines (append-only). references/compile-surfaces.md = 27.

Composition measured before PR₁ (shape still holds; re-derive the numbers):

section	lines
The round loop	1870 — step 5 Dispatch 587 (Prompt template 326), step 7 Review 380, step 0 sweep 200, step 6 Collect 195, 入队与落地 167, step 8 130
Operational notes	612 (21 notes, each = rule + incident narrative)
Domain lanes	209 (incl. the spec-tooling 沿革 111, self-labelled "沿革, 不是待办")
State model / Epic / Guardrails / report contract	~300, mostly load-bearing

Target and method

• Target ~1400–1600 lines in the main file (roughly −50%).
• Every rule keeps three things in the main file: the imperative, its criteria/command, and a one-line case anchor (issue number). Narratives, 沿革, worked examples and incident retellings move verbatim to references/incidents.md (append-only, one 出处 line per section, matching the convention PR pm-dispatch SKILL batch: eight ruled amendments — four-lens block, ADR-class skills, three-query board, queue criteria, five shift lessons, claim spelling, seat-post bounds, dispatch-contract rank (#7631) #7698 established with 24 such moves) or a new references/operational-notes.md if the notes section warrants its own file.
• Machine-consumed content stays: domain-lane table, 词表 roster, seat/label setup loop, the escalation frame (all four gate-synchronized copies — check:skill-frame-sync), report contract JSON.
• ⛔ No rule deletion. Compression moves prose; removing a binding rule, criterion, or prohibition requires its own maintainer ruling. A reviewer must be able to diff old→new and see every imperative still present.
• Ratchet: lower the ceiling to the achieved count (shrink-only lock-in) in the same PR.

Constraints

• File surface: .claude/skills/pm-dispatch/SKILL.md, .claude/skills/pm-dispatch/references/**, the ratchet config. ⛔ No docs/adr/**, no content/docs/releases/**.
• ADR-class terminal state (pm-dispatch SKILL: skills updates are ADR-class — human review/merge required (maintainer ruling 2026-08-11) #7548, now live in SKILL.md step 7 + Guardrails): draft/review by AI seats; ⛔ no AI seat merges, enqueues, or arms auto-merge — the maintainer merges manually. Round reports carry an "awaiting a human merge" line until it lands.
• Dispatch tier: model: claude-fable-5 mandatory (any card editing .claude/skills/pm-dispatch/**, maintainer 2026-08-10), mode:cloud. ⚠️ The filing session exhausted its Fable budget — whoever picks this up needs headroom for an L-sized card.
• skip-changeset label (.claude/ only; 空 frontmatter changeset 相对 skip-changeset 标签零收益、单向风险 —— 「禁止空 changeset 进 .changeset/」的决策证据(#5292 结案后无处存放) #5471 rejects empty changesets).
• Gates for this surface: check:pm-skill-ratchet, check:skill-frame-sync, check:doc-authoring, check:nul-bytes, plus pnpm --filter @objectstack/lint run check:doc-formula-expressions after building the lint dependency closure.
• Sanitizer discipline on every SKILL.md write (HTML entities for literal angle brackets; read back and verify fragments survived).
• Fixes this card + Part of #7631; close [batch] pm-dispatch SKILL consolidated amendments + compression — eight ruled cards, two serialized PRs (skills seat, round 1) #7631 when this lands.

Prior art to reuse

PR #7698's diff is the pattern: each moved section left an anchor + pointer in place and gained an 出处 line at the destination. The cloud dev session that did PR₁ (session_01KCFsFypEHm1Cnp26yAofxg, now archived) sketched this plan in its report's open_questions[2] on #7631.

[os-zhuang]

Claim: PM loop round 1 (skills seat)
Session: session_01XoWxhuq3WNNaZUTs6kWdk8
Branch: claude/issue-7754-pm-skill-compression
Worktree: objectstack-issue-7754 (cloud session — its own container and clone)
Domain: domain:skills
File surface: .claude/skills/pm-dispatch/SKILL.md, .claude/skills/pm-dispatch/references/**, scripts/pm/check-skill-line-ratchet.mjs (ratchet config; stop on breach; explain in the report)
Container & model: L, mode:cloud, model: claude-fable-5 (mandatory clause — the card edits .claude/skills/pm-dispatch/**; maintainer 2026-08-10 ruling)
Serial constraints cleared: none in flight — zero open PRs touch either skills root (searched 2026-08-11 ~12:5xZ); hot-file queue on SKILL.md empty per seat post #7623; last merge on this file is PR #7698 (today, same-day churn — flagged in the dispatch prompt). Premise re-verified on origin/main: SKILL.md = 3050 lines.

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[os-zhuang]

Dispatched (PM loop round 1, skills seat): cloud dev session session_01EzA8tDHxF9SY1esRC1TEGB, model: claude-fable-5, created 2026-08-11 12:53Z, outcome branch claude/issue-7754-pm-skill-compression. Collection: os-dev-report comment on this issue + draft PR; the PM subscribes to the PR once it exists. Terminal state is ADR-class — the PR awaits a human merge.

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[os-zhuang]

{
  "issue": 7754,
  "status": "done",
  "branch": "claude/issue-7754-pm-skill-compression",
  "pr": "https://github.com/objectstack-ai/objectstack/pull/7766",
  "premise_still_valid": true,
  "summary": "SKILL.md compressed 3050 -> 2568 lines (re-measured on origin/main post-PR #7698 before starting; premise held). 57 narrative/incident/history/worked-example sections moved VERBATIM to references/incidents.md (437 -> 1517 lines, append-only, one provenance line per section, PR #7698 convention). Every imperative/criterion/command kept in the main file as imperative + criteria/command + one-line case anchor with a section pointer; a mechanical sweep of all no-go-marked lines old->new(main+references) verified the 6 textual diffs are condensation artifacts whose imperative survives. Machine-consumed content untouched: domain-lane table, label roster, setup loop, all four frame-sync escalation-frame copies (gate green, byte-identical), step-5 prompt template, maintainer ruling quotes, report-contract JSON. Ratchet lowered 3050 -> 2568 in the same PR (shrink-only). PR #7766 opened as DRAFT and stays draft (ADR-class per #7548) - merging is the maintainer's manual act.",
  "tests": "All five card gates green in the task worktree (self-tests included): pnpm check:pm-skill-ratchet (5/5; 2568/2568, headroom 0); pnpm check:skill-frame-sync (12/12; 4 copies isomorphic, 4 count mentions agree); pnpm check:doc-authoring (375 files clean); pnpm check:nul-bytes (7114 files clean); pnpm --filter @objectstack/lint run check:doc-formula-expressions after building the lint closure (24/24 self-test; 22+9 examples clean). CI on PR #7766: in_progress at report time (report-at-draft-PR contract; PM owns convergence readouts).",
  "open_questions": [
    {
      "question": "Target shortfall: the card's ~1400-1600 line target is not reachable without deleting binding rules, which this card forbids. The card's composition table was measured BEFORE PR #7698; PR-1 had already moved 24 narrative sections out. After this PR the remaining 2568 lines are predominantly imperatives, criteria, commands, templates and gate-pinned copies. What is the disposition of the residual ~1000-line gap?",
      "options": [
        "A - Accept 2568 as the achieved shrink-only lock-in; close #7631 when this lands (no further action).",
        "B - Maintainer-ruled second pass that permits MERGING/DELETING overlapping rules (e.g. notes 1/21 queue-membership family, step-6 liveness family) - needs its own ruling per the red line.",
        "C - Move whole rule-dense conditional-clause blocks into a second on-demand reference - rejected by me: it takes binding text out of the hot file every seat loads, which the escalation-frame/gate design deliberately avoids."
      ],
      "recommendation": "A, because the red line (no rule deletion) is the binding constraint and the maintainer's directive was compression, not rule reduction; B only if the maintainer explicitly wants the file under ~2000 lines, and it should be its own ADR-class card."
    }
  ],
  "out_of_scope_findings": [
    "filed as #7767: pm-dispatch Guardrails carries a dangling pre-existing sentence fragment ('someone else, never dispatch a needs-user-decision issue.') whose parent bullet was lost on main before this card; left byte-identical in PR #7766, repair lead recorded on the issue."
  ]
}

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