Bootstrap coulomb-loop engagement: governance, loops, and activity definitions.

Register with state-hub, accept DEC-001–004 and ADR-004 rotation policy, scaffold
pilot roster, hourly ActivityDefinition copies, and bootstrap log after schedule
init on three custodian pilot repos.

loops/regulator/rotation-policy.yml

@@ -0,0 +1,38 @@
+version: "1"
+adr: ADR-004
+status: design  # implementation in LOOP-WP-0004 T09
+
+window_cycles: 14
+signals_required: 3  # of 4 below
+
+signals:
+  quality_plateau:
+    metric: avg_quality_delta
+    threshold: 0.02
+    comparison: prior_window
+  success_stable:
+    metric: success_rate
+    threshold: 0.85
+    operator: gte
+  optimizer_stall:
+    metric: new_actionable_recommendations
+    threshold: 0
+    operator: eq
+  marginal_gain:
+    metric: progress_events_or_merged_changes
+    threshold: 0
+    operator: eq
+
+actions_on_saturation:
+  - set_roster_status: saturated
+  - disable_schedule_agent: optimization
+  - promote_next_from: expansion_queue
+  - record_decision: state-hub
+  - elevate_priority: optimization_session
+
+revisit_saturated:
+  cadence: monthly
+  triggers:
+    - ci_regression
+    - new_active_workstream
+    - manual_operator_request