Drop Spin from docs and helper scripts; run the stack and container
exec via docker compose with docker-compose.yml and docker-compose.dev.yml.
Update firewall-delegation tests to match the new commands.
Update Railpack seed examples to use the expected Flask start command and Go/Rust exposed ports. Adjust smoke coverage to run Symfony by default and accept reachable 4xx responses, and extend seeder tests for per-example branch and port assertions.
Add feature tests covering railpack build pack via REST API and
Livewire UI components, plus a bash smoke test that deploys seeded
railpack-* example apps against the local dev stack and verifies
COOLIFY_*, SOURCE_COMMIT, and RAILPACK_* env vars land correctly.