feat: schedule init --engagement for customer bootstrap presets

Add --engagement, --agents, and --bootstrap-cadence flags to scaffold
hourly/daily/weekly engagement schedules. Hourly bootstrap keeps
cadence: daily with hourly cron overrides per coulomb-loop ADR-003.
Document activity-core requirements in activity-core-handoff-engagement.md.
Closes KAIZEN-WP-0008 T02 and T04.

docs/integrations/customer-engagement-playbook.md

@@ -0,0 +1,66 @@
+# Customer Engagement Playbook (supplier)
+
+How kaizen-agentic supports a **customer engagement repo** (e.g. coulomb-loop)
+that orchestrates improvement loops across a pilot roster.
+
+## Roles
+
+| Repo | Role |
+|------|------|
+| Customer (coulomb-loop) | Roster, ActivityDefinition copies, cadence policy, loop health |
+| Supplier (kaizen-agentic) | Agents, CLI, integration contracts |
+| Target repos | `.kaizen/` state (schedule, memory, metrics) |
+| activity-core | Cron + event orchestration, task creation |
+
+## Bootstrap checklist
+
+### 1. Customer repo
+
+- Register engagement in state-hub
+- Commit pilot roster (`loops/kaizen-stack/roster.yaml`)
+- Copy ActivityDefinitions to `activity-definitions/`
+- Enable definitions incrementally (metrics → coach → optimization)
+
+### 2. Target repos (per pilot)
+
+```bash
+kaizen-agentic schedule init --engagement <customer-slug> \
+  --agents coach,optimization --bootstrap-cadence hourly
+kaizen-agentic schedule validate
+kaizen-agentic memory init coach
+kaizen-agentic memory init optimization
+```
+
+Hourly bootstrap writes `cadence: daily` with hourly `cron` overrides — see
+[activity-core-handoff-engagement.md](activity-core-handoff-engagement.md) R2.
+
+### 3. Session close (each agent run)
+
+```bash
+kaizen-agentic metrics record <agent> --success --time <s> --quality <0-1>
+kaizen-agentic metrics record <agent> --success --time <s> --quality <0-1> --emit-event
+```
+
+### 4. activity-core
+
+Hand off [activity-core-handoff-engagement.md](activity-core-handoff-engagement.md)
+requirements before enabling event-driven quality escalation.
+
+## Cadence promotion
+
+Customer regulator (LOOP-WP-0004) approves promotion. Re-init or patch schedules:
+
+```bash
+# Stabilize phase
+kaizen-agentic schedule init --engagement <slug> \
+  --bootstrap-cadence daily --force
+
+# Operate phase
+kaizen-agentic schedule init --engagement <slug> \
+  --bootstrap-cadence weekly --force
+```
+
+## Related
+
+- [KAIZEN-WP-0008](../../workplans/kaizen-agentic-WP-0008-coulomb-loop-supplier-engagement.md)
+- coulomb-loop `INTENT.md` and `workplans/LOOP-WP-*`