Add MCP structured degraded-startup classification (P2.10):
- classify MCP failures as startup/handshake/config/partial
- expose failed_servers + recovery_recommendations in tool output
- add mcp_degraded output field with server_name, failure_mode, recoverable
Canonical lane event schema (P2.7):
- add LaneEventName variants for all lifecycle states
- wire LaneEvent::new with full 3-arg signature (event, status, emitted_at)
- emit typed events for Started, Blocked, Failed, Finished
Fix let mut executor for search test binary
Fix lane_completion unused import warnings
Note: mcp_stdio::manager_discovery_report test has pre-existing failure on clean main, unrelated to this commit.
Implement automatic lane completion detection:
- detect_lane_completion(): checks session-finished + tests-green + pushed
- evaluate_completed_lane(): triggers CloseoutLane + CleanupSession actions
- 6 tests covering all conditions
Bridges the gap where LaneContext::completed was a passive bool
that nothing automatically set. Now completion is auto-detected.
ROADMAP P1.3 marked done.
