- diagnostics.py: TunnelCheckResult with SSH process liveness, port
probe, and optional API health check; check_tunnel / check_all_tunnels
- cli.py: bridge status shows LIVE column and [STALE] marker when state
says connected but PID is dead; bridge check wired to diagnostics
- state.py: read_raw_pid helper; _pid_alive exported for reuse
- capabilities.py: capabilities registry stubs
- mcp_server/server.py: expose check_tunnel and tunnel capabilities
over MCP
- SCOPE.md: rapid orientation document
- workplans/OPS-WP-0001-diagnostics.md: workplan backing this feature
- tests: 207 passing (test_cli, test_mcp, test_diagnostics)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
