feat: complete LOOP-WP-0003 and LOOP-WP-0004

Registry hygiene: 3-round pilot bootstrap smoke, helix_forge rollout
expansion, daily cadence promotion (DEC-006). Loop regulator: daily
collector and weekly session cadence (DEC-007), rotation runbook (T09).

loops/regulator/rotation-runbook.md

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+# Repo rotation runbook (ADR-004)
+
+LOOP-WP-0004 T09 — manual rotation during bootstrap; automation deferred to
+`kaizen-agentic metrics rotation-signals` CLI.
+
+## Saturation assessment
+
+Per `rotation-policy.yml`, compute signals for each active repo (14-cycle window):
+
+| Signal | Source |
+|--------|--------|
+| quality_plateau | `avg_quality_delta < 0.02` vs prior window |
+| success_stable | `success_rate >= 0.85` |
+| optimizer_stall | 0 new actionable recommendations |
+| marginal_gain | 0 progress events / merged changes |
+
+**Rotate when:** ≥3 of 4 signals true (saturation_score ≥ 0.75).
+
+```bash
+# Per pilot repo (supplier CLI follow-on)
+kaizen-agentic metrics show coach --target /home/worsch/<repo>
+kaizen-agentic metrics show optimization --target /home/worsch/<repo>
+kaizen-agentic metrics optimize --target /home/worsch/<repo>
+```
+
+## Manual rotation procedure
+
+1. Run regulator session (`session-template.md`); confirm saturation recommendation
+2. Update `loops/kaizen-stack/roster.yaml`:
+   - Move repo from `active` → `saturated`
+   - Promote next slug from `expansion_queue`
+3. Patch saturated repo `.kaizen/schedule.yml`:
+   ```yaml
+   agents:
+     optimization:
+       enabled: false
+   ```
+4. Record decision in state-hub (`record_decision` or progress event)
+5. Append rotation event to `loops/kaizen-stack/health.jsonl`
+
+## Bootstrap status (2026-06-18)
+
+No rotation executed — pilots still accumulating metrics (<14 cycles).
+**Next review:** after 14 daily kaizen-stack cycles or explicit operator request.
+
+## Automation path
+
+After 2 successful manual rotations:
+
+- Enable `saturation_score` in health collector definition
+- Supplier ships `metrics rotation-signals` (KAIZEN-WP-0008 extension)
+- Regulator may auto-recommend; human still commits roster changes