Service.OnStartup now creates sandboxed I/O medium, opens SQLite store,
starts gRPC listener on Unix socket, loads .core/view.yml manifest, and
launches Deno sidecar with CORE_SOCKET env var. Full shutdown in reverse.
New files: listener.go (Unix socket gRPC server), runtime/main.ts (Deno
entry point), integration_test.go (full boot with real Deno).
34 tests pass (33 unit + 1 integration).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Process launch with context cancellation, socket directory auto-creation,
channel-based stop synchronization. Uses sleep as fake Deno in tests.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>