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.

.claude/rules/architecture.md

@@ -0,0 +1,25 @@
+## Architecture
+
+`coulomb-loop` is a **markdown-first engagement layer** — no application runtime.
+
+```
+activity-core (cron/event)
+  → state-hub roster + coulomb-loop rosters
+  → tasks on target repos
+  → kaizen-agentic schedule prepare / metrics CLI
+  → coding-agent sessions (supplier agents)
+```
+
+### Layers
+
+| Layer | Repo | Role |
+|-------|------|------|
+| Customer contracts | coulomb-loop | Workplans, ADRs, ActivityDefinition copies, `loops/` |
+| Supplier IP | kaizen-agentic | Agents, CLI, ADR-002–006 |
+| Scheduler | activity-core | Temporal schedules, resolvers |
+| Roster | state-hub | Repo list, workstreams, events |
+| Execution state | target repos | `.kaizen/schedule.yml`, memory, metrics |
+
+### Four loops
+
+See `INTENT.md` and LOOP-WP-0001–0004. LOOP-WP-0004 regulates cadence (ADR-003).