feat: advance LOOP-WP-0002/0003/0004 without activity-core blockers

Document event payload contract, draft disabled ActivityDefinitions for
CI/regulator/registry hygiene, initialize loop health snapshots and
regulator dashboard, record DEC-005 kaizen-stack promotion, and close
supplier-independent workplan tasks.

loops/quality-escalation/event-payload.md

@@ -0,0 +1,60 @@
+# Event payload contract — `kaizen.metrics.recorded`
+
+Customer contract for LOOP-WP-0002 T03. Supplier implementation:
+`kaizen-agentic metrics record --emit-event` (shipped KAIZEN-WP-0008 T03).
+
+## NATS subject
+
+```
+activity.kaizen.metrics.recorded
+```
+
+## Envelope (activity-core EventEnvelope)
+
+```json
+{
+  "id": "550e8400-e29b-41d4-a716-446655440000",
+  "type": "kaizen.metrics.recorded",
+  "version": "1.0",
+  "timestamp": "2026-06-18T12:00:00Z",
+  "publisher": "kaizen-agentic",
+  "attributes": {
+    "agent": "coach",
+    "project": "kaizen-agentic",
+    "summary": {
+      "success_rate": 0.75,
+      "execution_count": 12,
+      "avg_quality": 0.81
+    }
+  }
+}
+```
+
+### Attribute fields
+
+| Field | Type | Notes |
+|-------|------|-------|
+| `agent` | string | Agent from `metrics record <agent>` |
+| `project` | string | Repo slug (`KAIZEN_PROJECT_SLUG` or directory basename) |
+| `summary.success_rate` | float | Rolling rate from `summary.json` after append |
+| `summary.execution_count` | int | Total executions |
+| `summary.avg_quality` | float | From `avg_quality_score` in ADR-004 summary |
+
+## ActivityDefinition binding
+
+`low-success-rate-review` uses `type: event-payload` → `context.metrics`.
+Rule evaluates `context.metrics.summary.success_rate` (requires activity-core R1).
+
+## CLI (target repo)
+
+```bash
+kaizen-agentic metrics record coach --success --time 120 --quality 0.9 --emit-event
+```
+
+Requires `pip install 'kaizen-agentic[events]'` and `NATS_URL`.
+
+## Related
+
+- Supplier spec: `kaizen-agentic/docs/integrations/kaizen-metrics-recorded-event.md`
+- Thresholds: `loops/quality-escalation/thresholds.yml`
+- Definition: `activity-definitions/low-success-rate-review.md`