feat(FN-1569): add mission validation telemetry APIs and UI

- Emit fix-feature mission events and forward validator telemetry through mission execution
- Add core and dashboard API types plus a validation telemetry route in mission-routes
- Update SSE mission event handling so validation telemetry updates stream reliably to clients
- Add telemetry surfaces in MissionManager with corresponding mission-specific UI styling
- Expand MissionManager and mission e2e test coverage for validation telemetry flows

packages/core/src/index.ts

@@ -276,6 +276,7 @@ export type {
   FeatureEventPayload,
   FeatureDeletedPayload,
   FeatureLinkedPayload,
+  FixFeatureCreatedPayload,
   // Validator run types
   MissionValidatorRun,
   MissionAssertionFailureRecord,