feat(kb-management): name/acronym gate + entity-creation trigger + staleness observability

[jordanrburger]

Part of the de-personalized Patterns batch — upstreaming accumulated instance rules into the engine phases (Phase-1 work for the connector-based migration, #156). Follows the method from #157.

What

Three rules added to phases/core/kb-management.md (assembles into SKILL + DREAMING — mode: [briefing, consolidation, dreaming]):

• Never Guess a Name or Acronym Expansion (Pattern Fix README install instructions; add .claude-plugin/marketplace.json (closes #3) #14) — cite the full form from a primary source (signature, org docs, issue/PR body, calendar invite) or leave the token abbreviated and [unverified]. Never invent a plausible expansion — it reads as fact and propagates. Applies to org names, product/codenames, team names, and people's full names alike.
• Entity-creation trigger (Pattern feat: port Fathom connector to v0.4 engine layout #19) — mint a new entity file when a person/org/technology recurs across 3+ independent sources. Enriching files you already have is not a substitute for creating the ones you're missing.
• Staleness observability + search depth (Pattern perf(cc-session-cache): batch + cache the per-JSONL Python startups (closes #75) #88) — every KB file carries a machine-readable last_updated: (and ideally latest-commit date) so a scan can rank by staleness and a refresh driver can queue over-threshold files; opportunistic-only refresh lets the long tail rot. And don't scope completeness searches to a fixed channel set / from:me-style filters — a known-to-exist fact your scan missed is a search-depth miss, not an absence.

Verification

• Assembly checked via _assemble(cfg, kind): all three rules land in SKILL and DREAMING and do not leak into RESEARCH (matches the file's mode: [briefing, consolidation, dreaming]).
• Diff grepped clean of names / employer / customers / Slack IDs / repo-PR-Linear IDs / user paths. Pattern Fix README install instructions; add .claude-plugin/marketplace.json (closes #3) #14's originating example named a real customer — scrubbed; the rule is stated generically.

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