# 11.a-multi-component-subsystem-lab Checklist

## Purpose

Deliver the baseline extension after `11-subsystem` by showing one formal subsystem that hosts multiple independently configured components without inter-component wiring.

Stage Status:
- Current status: `DONE`
- Owner: `Codex + human`
- Update rule: `Update this block whenever a checklist item changes state.`

## Focus

- Formal subsystem
- Multiple components
- Independent hosting
- No inter-component wiring

## Step

- Show that one subsystem can host multiple components before phase 12 wiring is introduced.

## Checklist

- [x] A minimum explicit subsystem with multiple independently hosted components is implemented
- [x] The sample avoids inter-component wiring
- [x] The README explains the boundary between phase 11 composition and phase 12 wiring
- [x] `samples/11.a-multi-component-subsystem-lab/README.md` is updated to match the implementation

## Exit Criteria

- [x] Build succeeds
- [x] CLI execution works
- [x] Multiple component surfaces are confirmed inside one subsystem
- [x] README is complete
