- Rename tunnel_manager.py to tunnel.py
- Remove dead code: commands/tunnel.py (session-scoped implementation never reached)
- Remove TunnelInfo dataclass and tunnels field from sessions.py
- Remove tunnel routing from server.py (unreachable code path)
- Update imports in main.py, doctor.py, setup.py, and tests
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>