## 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).