PoseCap: Skill for Codex

<background_information> Removes plan files whose decision-record lifecycle is over. Git history retains the content; the working tree stops paying context cost on artifacts the LLM no longer needs to scan.

Three rules anchor the design:

• No CHANGELOG.md, no archive/ subdirectory. WORKFLOW.md Rule #2 forbids changelogs in narrative documents; an archive/ subdir still expands under directory globs. Git history is the ledger; /ad-commit after /ad-archive is the breadcrumb. git log --diff-filter=D -- doc/adr/ reaches it when needed.
• Status-driven, not age-driven. Accepted means binding regardless of age.
• Accepted ADRs require absorption proof. Nygard's tradition treats accepted ADRs as immutable; the kit's lean-tree value justifies removal only when the ADR's substance — not just its slug citation — has been moved into a binding document. The skill enforces this by grepping the named target for the ADR's core claim before allowing git rm. </background_information>

Tasks (doc/tasks/NNNN-*.md): include if Status: done. Exclude proposed, in-progress, blocked.

Specs (doc/specs/NNNN-*.md): include if Status: shipped. Exclude draft, accepted, anything superseded by SPEC-NNNN (chain target stays).

PRDs (doc/product/PRD.md single-product or doc/product/<slug>.md multi-product): include if Status: superseded. Exclude draft, accepted.

ADRs (doc/adr/NNNN-*.md):

• Auto-include if Status: superseded by ADR-NNNN or Status: deprecated. Chain target stays.
• Do NOT auto-include Status: accepted. Accepted ADRs require the explicit Step 3 absorption check.

Legacy plan docs (prose files under doc/ not in adr//tasks//specs//product/; e.g. doc/v0.2-cli-plan.md): present as candidates only when the user explicitly names them. No Status: field — user judgement required.

Step 2 — Present the slate. One block per category, one line per candidate, format:

### Tasks (done) — N candidates
- doc/tasks/NNNN-slug.md   done   <created date>   "<title>"

### Specs (shipped) — N candidates
(none)

### PRDs (superseded) — N candidates
(none)

### ADRs (superseded / deprecated) — N candidates
- doc/adr/NNNN-slug.md   superseded by ADR-MMMM   <date>

Print a one-line summary tail: Total: N candidates across M categories. Hard-delete via git rm; git history retains. No CHANGELOG or archive subdir.

If a category has zero candidates: render heading and (none) — do not skip silently.

If user named legacy plan docs: render under ### Legacy plan docs (user-named) — N candidates.

Step 3 — Confirm + accepted-ADR absorption gate.

Ask the user which categories to sweep. Default phrasing: "Proceed with all auto-included candidates? Or name a subset (e.g. 'tasks only', 'tasks + specs', 'skip ADR-0019')."

If the user adds any Status: accepted ADR to the removal set, run the absorption check before accepting:

1. Ask the user where the decision has been absorbed. Required form: <file>#<section-or-anchor> or <file>:<line> (e.g. ARCHITECTURE.md#data-flow, GUIDELINES.md§Naming, src/lib/profiles.js:23).
2. Extract two-to-four substance keywords from the ADR's title and Decision section (not the slug — substance). Example: ADR-0004 "File-based task tracking" → keywords file-based, task tracking, doc/tasks, Markdown.
3. Grep the absorption target for each keyword. Require at least one keyword match.
4. If grep fails: refuse removal. Print: "ADR-NNNN absorption not verified. Substance keyword <X> not found in <target>. Absorb the rationale first (edit the binding doc), then re-run /ad-archive and re-name this ADR."
5. If grep succeeds: add to removal set, print matched location as evidence.

Do not silently downgrade the check. The absorption rule is the design's load-bearing constraint.

Step 4 — Execute. Single git rm invocation for all confirmed files (one shell call, atomic stage):