feat(skills): add /prune-memory — curate .claude/memory/ registries
New personal skill to maintain memory registry hygiene. Gap identified
between existing tools:
- /caveman:compress — text-compresses one file, no curation
- /close — appends new entries end-of-session, doesn't prune
- /prune-memory (new) — audits, classifies, applies user-approved cleanup
Operations:
- Mark obsolete entries `status: superseded by <ID>` or `status: deprecated`
(no hard delete — append-only per CLAUDE.md memory rule).
- Merge similar entries (new ID, sources marked superseded).
- Caveman-compress bloated prose-heavy entries inline.
- Repair Index drift (missing rows, orphaned rows).
Workflow: STEP 0 precheck (refuses dirty working tree, git = backup)
→ STEP 1 audit (A obsolete / B similar / C bloated / D drift)
→ STEP 2 plan + mandatory user approval
→ STEP 3 apply safe→destructive
→ STEP 4 verify Index sanity + line-count report.
Follows superpowers:writing-skills CSO conventions: "Use when..." trigger
description (under 1024-char spec), Quick Reference table, Common
Mistakes table, Failure Paths table. v1 ships without baseline TDD test
(noted in skill body); STEP 2 approval gate is the safety net.
Co-Authored-By: Claude <noreply@anthropic.com>
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