fix(dx): audit CLAUDE.md, error handling, and test coverage
- Update CLAUDE.md: document Detach, DisableCapture, ShutdownTimeout,
auto-registration, graceful shutdown, and error handling conventions;
add missing go-log and go-io dependencies
- Replace ServiceError type in process_global.go with coreerr.E()
sentinel errors for consistency with the rest of the package
- Wrap raw error returns in Registry.Register, Registry.Unregister,
and PIDFile.Release with coreerr.E() for proper context
- Add tests for Service.Kill, Service.Output, Service.OnShutdown,
Service.OnStartup, Service.RunWithOptions, Service.Running,
Process.Signal, Daemon.Run (context cancellation),
Daemon.Stop (idempotent), DisableCapture, Detach, env vars,
exec.WithDir, exec.WithEnv, exec.WithStdin/Stdout/Stderr,
exec.RunQuiet
- Coverage: root 82.7% → 88.3%, exec/ 61.9% → 87.3%
Co-Authored-By: Virgil <virgil@lethean.io>
87ef2dbe16