Stabilize iOS/watchOS/tvOS apps and add cross-platform audit remediation

docs/step10_reliability_round2.md

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+# Step 10 Reliability Round 2
+
+## Coverage
+
+- Reviewed and patched:
+  - `iphone/Werkout_ios/BridgeModule+Watch.swift`
+  - `iphone/Werkout_ios/BridgeModule+WorkoutActions.swift`
+  - `iphone/Werkout_ios/CurrentWorkoutInfo.swift`
+  - `iphone/Werkout_watch Watch App/WatchDelegate.swift`
+  - `iphone/Werkout_ios/UserStore.swift`
+- Validation:
+  - `./scripts/smoke/smoke_all.sh`
+  - iOS/tvOS analyzer passes
+
+## Fixes
+
+1. Main-thread state safety for watch session callbacks
+   - Wrapped `didReceiveMessageData` action handling and `activationDidCompleteWith` state transitions on main.
+   - Prevents shared bridge state (`@Published` workout/watch properties + queued message mutations) from being changed off-main.
+
+2. Removed dead closure path that could retain `BridgeModule`
+   - Removed unused `CurrentWorkoutInfo.complete` closure and its assignment in `BridgeModule+WorkoutActions.start(workout:)`.
+   - Reduces lifecycle risk and removes dead behavior.
+
+3. HealthKit authorization crash hardening on watch launch
+   - Replaced force-unwrapped quantity types with guarded optional binding in `WatchDelegate`.
+   - Logs and exits cleanly if required HealthKit quantity types are unavailable.
+
+4. Cross-target notification compile stability
+   - Updated `UserStore.logout` to post `Notification.Name("CreatedNewWorkout")` directly.
+   - Avoids reliance on an iOS-only extension file when `UserStore` is compiled in tvOS target.
+
+## Validation
+
+- Smoke suite passed:
+  - token scan
+  - SharedCore tests
+  - iOS/watchOS/tvOS builds
+