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

docs/step9_memory_lifecycle_round1.md

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+# Step 9 Memory/Lifecycle Round 1
+
+## Coverage
+
+- Audited lifecycle cleanup and resource teardown in:
+  - `iphone/Werkout_ios/subview/PlayerUIView.swift`
+  - `iphone/Werkout_ios/Views/WorkoutDetail/WorkoutDetailView.swift`
+  - `iphone/Werkout_ios/Views/WorkoutDetail/ExerciseListView.swift`
+  - `iphone/Werkout_ios/Views/ExternalWorkoutDetailView.swift`
+  - `iphone/Werkout_ios/subview/AllExerciseView.swift`
+  - `iphone/Werkout_ios/Views/CreateWorkout/CreateExerciseActionsView.swift`
+  - `iphone/Werkout_ios/AudioEngine.swift`
+  - `WekoutThotViewer/WekoutThotViewer/ContentView.swift`
+- Validation:
+  - `./scripts/smoke/smoke_all.sh`
+
+## Fixes
+
+1. Player view teardown safety
+   - `PlayerView` now pauses previous players when swapping and performs explicit teardown in `dismantleUIView`.
+
+2. Workout detail closure retention risk
+   - Clears `BridgeModule.shared.completedWorkout` on `WorkoutDetailView` disappear.
+
+3. Player pause on dismiss across views
+   - Added `onDisappear` player pause in workout detail exercise list, create-exercise preview, all-exercise preview, external display, and tvOS content view.
+
+4. External display player reuse
+   - Added URL tracking + replay path to avoid reallocating AVPlayer when URL is unchanged.
+
+5. Audio playback resource churn
+   - Stops existing players before replacement and logs failures via `RuntimeReporter` instead of `print`.
+
+## Validation
+
+- Smoke suite passed:
+  - token scan
+  - SharedCore tests
+  - iOS/watchOS/tvOS builds