slice 1.0.8: sidecar manager (single instance) — ng serve --port 4300

[sausi-7]

Phase 1.0 demo slice · Difficulty: D2

Scope

Spawn one ng serve --port 4300 against workspace/demo/ when the API starts (or on first /demo/start call). Kill on API shutdown via atexit.

No port pool, no multi-project — that's full Phase 1.

Acceptance criteria

• No orphan ng serve after Ctrl+C on the API.
• Health probe at localhost:4300/ returns 200 once compiled.
• Documented in apps/api/README.md.