feat: scalable entities & patterns architecture

- Entity format: 3-line compact registry (### Name / key facts / status+links)
  Heavy entries promoted to thread files. Cross-domain pointers for shared entities.
- Pattern satellites: core patterns.md cap reduced from 110→70 lines (5.5KB).
  Domain-specific patterns go in satellite files loaded only by owning skill.
- Reflect: pattern routing rules, entity format enforcement (step 3b)
- Housekeeping: entity registry enforcement (step 5b), glacier inactive entities
- Evolve: scorecard metrics for pattern distribution + entity compression ratio
- README: updated entity example to 3-line format

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -94,15 +94,16 @@ Here's what builds up over time. None of this is pre-filled — it emerges from
 - 2026-03-12 [insight]: Realized I've been avoiding the budget conversation. Not about money — about control.
 ```
 
-**`memory/work/acme/entities.md`** — people and context:
+**`memory/work/acme/entities.md`** — compact 3-line registry:
 
 ```markdown
-### Sarah Chen
-- Role: Engineering Manager (direct report to VP Eng)
-- Context: Joined Jan 2025. Runs platform team. Prefers async updates over meetings.
-- Notes: Advocated for my promotion. Values shipping over polish.
+### Sarah Chen (Engineering Manager)
+- Direct report to VP Eng | Joined Jan 2025 | Runs platform team | Prefers async over meetings
+- status: active | last: 2026-03-10
 ```
 
+Heavy entries get promoted to thread files — the entity stub just links: `→ [[work/acme/sarah-chen]]`.
+
 ### Progressive Condensation
 
 Two processes: