feat(FN-1453): fix mission autopilot progression and state refresh

- Fix mission autopilot slice activation when tasks complete
- Fix state refresh in MissionManager to properly reflect autopilot status
- Fix scheduler to correctly trigger autopilot progression events
- Add unit tests for mission store autopilot state transitions
- Add component tests for MissionManager autopilot toggle and state display
- Add e2e tests for mission autopilot lifecycle (enable → task completion → slice progression)
- Update documentation with autopilot state machine details

packages/engine/src/scheduler.ts

@@ -795,7 +795,10 @@ export class Scheduler {
       }
 
       const mission = missionStore.getMission(milestone.missionId);
-      if (!mission || mission.status !== "active" || !mission.autoAdvance) {
+      // Use autopilotEnabled as canonical, fall back to autoAdvance for backward compat
+      const shouldAutoAdvance =
+        mission?.autopilotEnabled === true || mission?.autoAdvance === true;
+      if (!mission || mission.status !== "active" || !shouldAutoAdvance) {
         return;
       }