Execution is now identical for local and remote:
- Session calls Spawn()/SpawnRemote() → owns *Process with socket
- Clients call Dial(LocalAddr(socket)) → *Conn over Unix socket
- ollie-remote serves --listen mode with multi-client accept loop
- Builtins (shell, tool_load, skill_load) run in subprocess with registries
Lifecycle:
- Pdeathsig ensures children die with parent (no orphans)
- Cleanup: SIGTERM → 3s grace → SIGKILL (guaranteed)
- Socket paths use atomic counter for uniqueness
- Session Kill() closes Process
Protocol:
- Extended RPC: set_env, set_cwd, detach, list_detached, etc.
- Shell goes through builtin dispatch (parses 'cmd' field correctly)
- Streaming output via JSON-RPC notifications
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