feat(ios): enhance background task handlers and documentation

Enhance background task handlers with recovery logic and comprehensive
code documentation:

Background Task Handlers (Section 3.3):
- Enhance handleBackgroundFetch with recovery logic:
  - Verify scheduled notifications after fetch
  - Schedule next background task automatically
  - Improved expiration handling with graceful cleanup
- Enhance handleBackgroundNotify with recovery logic:
  - Verify scheduled notifications state
  - Prepare for next task scheduling
  - Improved expiration handling with graceful cleanup
- Add getNextScheduledNotificationTime() helper method
  - Wraps scheduler.getNextNotificationTime() with timeout
  - Used for automatic next task scheduling

Code Documentation (Section 10.1):
- Add comprehensive file-level documentation to ReactivationManager:
  - Purpose, features, architecture overview
  - Recovery scenarios supported
  - Error handling approach
  - Thread safety notes
  - Cross-references to requirements docs
- Add detailed method-level documentation:
  - performRecovery(): process, scenarios, error handling
  - detectScenario(): detection logic, error handling
  - performColdStartRecovery(): steps, return values
  - detectMissedNotifications(): criteria, error handling
  - verifyFutureNotifications(): verification process
  - rescheduleMissingNotification(): process, throws
  - handleTerminationRecovery(): comprehensive recovery
  - performBootRecovery(): boot recovery process
  - recordRecoveryHistory(): history recording
  - recordRecoveryFailure(): failure recording
  - detectBootScenario(): detection logic
  - updateLastLaunchTime(): storage details
  - verifyBGTaskRegistration(): diagnostic method
- Add @param, @return, @throws tags to all methods
- Document error handling behavior for all methods

Implementation Status (Section 10.2):
- Update ios/Plugin/README.md with current status:
  - Mark all completed features as ✅
  - Add new components (DAO classes, ReactivationManager)
  - Update version to 1.1.0
  - Add recovery scenarios supported
  - Update architecture overview
  - Add last updated date (2025-12-08)

Completes sections 3.3, 10.1, and 10.2 of iOS implementation checklist.

ios/Plugin/README.md

@@ -2,6 +2,9 @@
 
 This directory contains the iOS-specific implementation of the DailyNotification plugin.
 
+**Last Updated**: 2025-12-08  
+**Version**: 1.1.0
+
 ## Current Implementation Status
 
 **✅ IMPLEMENTED:**
@@ -10,12 +13,38 @@ This directory contains the iOS-specific implementation of the DailyNotification
 - Power management (`DailyNotificationPowerManager.swift`)
 - Battery optimization handling
 - iOS notification categories and actions
+- **App Launch Recovery** (`DailyNotificationReactivationManager.swift`)
+  - Cold start recovery
+  - Termination recovery
+  - Boot recovery
+  - Scenario detection
+  - Missed notification detection
+  - Future notification verification
+- **Core Data Integration**
+  - NotificationContent, NotificationDelivery, NotificationConfig entities
+  - DAO classes for all entities (CRUD operations)
+  - Data type conversions (Date ↔ Int64, etc.)
+  - PersistenceController with entity verification
+- **Logging & Observability**
+  - Comprehensive recovery logging
+  - Metrics recording in Core Data History
+  - Execution time tracking
+- **Error Handling**
+  - iOS-specific error codes
+  - Graceful error handling (non-fatal)
+  - Partial results on failures
+- **API Methods**
+  - iOS-specific notification permission methods
+  - Background task status methods
+  - Pending notifications query
+
+**⚠️ PARTIALLY IMPLEMENTED:**
+- `BGTaskScheduler` for background data fetching (basic registration)
+- Background task management (needs enhancement)
 
 **❌ NOT IMPLEMENTED (Planned):**
-- `BGTaskScheduler` for background data fetching
-- Background task management
 - Silent push nudge support
-- T–lead prefetch logic
+- T–lead prefetch logic (enhancement)
 
 ## Implementation Details
 
@@ -25,10 +54,19 @@ The iOS implementation currently uses:
 - `UserDefaults` for local data storage ✅
 - iOS notification categories and actions ✅
 - Power management and battery optimization ✅
+- **Core Data** for structured data persistence ✅
+- **BGTaskScheduler** for background task registration ✅
+- **App Launch Recovery** for notification reconciliation ✅
+
+**Architecture:**
+- **ReactivationManager**: Handles app launch recovery scenarios
+- **DAO Layer**: Core Data access objects for all entities
+- **Data Conversions**: Type conversion utilities (Date, Int, String, JSON)
+- **History Recording**: Core Data persistence for recovery metrics
+- **Error Handling**: Comprehensive error codes and graceful degradation
 
 **Planned additions:**
-- `BGTaskScheduler` for background data fetching
-- Background task management
+- Enhanced background task management
 - Silent push support
 
 ## Native Code Location
@@ -42,23 +80,41 @@ The native iOS implementation is located in the `ios/` directory at the project
 3. `DailyNotificationConfig.swift`: Configuration options ✅
 4. `DailyNotificationMaintenanceWorker.swift`: Maintenance tasks ✅
 5. `DailyNotificationLogger.swift`: Logging system ✅
+6. **`DailyNotificationReactivationManager.swift`**: App launch recovery ✅
+7. **`HistoryDAO.swift`**: Recovery history persistence ✅
+8. **`NotificationContentDAO.swift`**: Notification content CRUD ✅
+9. **`NotificationDeliveryDAO.swift`**: Delivery tracking CRUD ✅
+10. **`NotificationConfigDAO.swift`**: Configuration CRUD ✅
+11. **`DailyNotificationDataConversions.swift`**: Type conversion utilities ✅
+12. **`DailyNotificationErrorCodes.swift`**: iOS-specific error codes ✅
+13. **`DailyNotificationModel.swift`**: Core Data model & PersistenceController ✅
 
-**Missing Components (Planned):**
-- `BackgroundTaskManager.swift`: Handles background fetch scheduling
-- `NotificationManager.swift`: Manages notification creation and display
-- `DataStore.swift`: Handles local data persistence
+**Background Task Components:**
+- `DailyNotificationBackgroundTasks.swift`: Background task handlers ⚠️ (basic)
+- `DailyNotificationBackgroundTaskManager.swift`: Task management ⚠️ (basic)
 
 ## Implementation Notes
 
 - Uses UserDefaults for lightweight data storage ✅
+- Uses Core Data for structured data persistence ✅
 - Implements proper battery optimization handling ✅
 - Supports iOS notification categories and actions ✅
 - Handles background refresh limitations ✅
+- **App launch recovery with scenario detection** ✅
+- **Comprehensive error handling (non-fatal)** ✅
+- **Metrics recording and observability** ✅
+- **BGTaskScheduler registration** ✅
+
+**Recovery Scenarios Supported:**
+- ✅ Cold Start: App terminated, notifications may need verification
+- ✅ Termination: App terminated, all notifications cleared
+- ✅ Boot: Device rebooted, full recovery needed
+- ✅ Warm Start: No recovery needed (optimization)
 
 **Planned Features:**
-- BGTaskScheduler for reliable background execution
+- Enhanced background task budget management
 - Silent push notification support
-- Background task budget management
+- Advanced prefetch logic
 
 ## Testing