Replace the ~370-line bash develop.sh with a Go program using
serpent for CLI flags, errgroup for process lifecycle, and
codersdk for setup. develop.sh becomes a thin make + exec wrapper.
- Process groups for clean shutdown of child trees
- Docker template auto-creation via SDK ExampleID
- Idempotent setup (users, orgs, templates)
- Configurable --port, --web-port, --proxy-port
- Preflight runs lib.sh dependency checks
- TCP dial for port-busy checks
- Make target (build/.bin/develop) for build caching
Mathias Fredriksson