0.6.0 — Phase 33: worker-native skills, MCP tunnel, file locality

- Skill discovery tools (search_skills/install_skill) + registry (19 skills)
- Skill sync server→worker over the channel (reconcile on reconnect)
- /skills:ro container mounts + home symlinks both sides
- MCP tunnel: loopback streamable-http bridge → mcp_rpc channel op →
  worker spawns MCP servers inside agent containers (podman exec -i)
- Per-agent mcp_servers roster config + daedalus_home fix (per-agent
  SettingsStore) + skills_dirs opt-in fix
- file_push: server→worker file transfer, files stay on the rig
- Live-tested on dev-rig: remotion 3s mp4 render, Blender 4.5 render
  via MCP through the agent tool loop