The playbook only touches the idle slot

The lab playbook does not stop the live slot. It reads state.json, picks the opposite of live, and renders compose for that slot only.

Six taught steps

1. Read state. The first deploy pretends the other slot is live so the first step stays deterministic.
2. Check the target port. If another process holds it, stop.
3. Pull the image and start the idle slot.
4. Run the health check.
5. Patch the Caddy route.
6. Stop the old slot and write the new state.

services:
  titikterang:
    image: registry.titikterang.local:5000/titikterang:v1.2.3
    ports:
      - "8080:3000"

services:
  titikterang-green:
    image: registry.titikterang.local:5000/titikterang:v1.2.4-dev
    ports:
      - "127.0.0.1:18081:3000"

The playbook sketch lives in examples/titikterang/ansible.