docs(ios): update test app docs with recent implementation details

Updated iOS test app documentation to reflect recent implementation work:
channel methods, permission methods, BGTaskScheduler simulator limitation,
and plugin discovery troubleshooting.

Changes:
- Added channel methods (isChannelEnabled, openChannelSettings) to UI mapping
- Fixed permission method name (requestPermissions → requestNotificationPermissions)
- Added checkPermissionStatus to UI mapping
- Added Channel Management section explaining iOS limitations
- Added BGTaskScheduler simulator limitation documentation (Code=1 is expected)
- Added plugin discovery troubleshooting section (CAPBridgedPlugin conformance)
- Added permission and channel methods to behavior classification table
- Updated Known OS Limitations with simulator-specific BGTaskScheduler behavior

Files modified:
- doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md: UI mapping, debugging scenarios
- doc/test-app-ios/IOS_PREFETCH_TESTING.md: Known limitations, behavior classification

doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md

@@ -69,6 +69,7 @@ The iOS test app **MUST** use the same HTML/JS UI as the Android test app to ens
 - Test notification button
 - Check permissions button
 - Request permissions button
+- Channel management buttons (Check Channel Status, Open Channel Settings)
 - Status display area
 - Log output area (optional, for debugging)
 
@@ -86,12 +87,17 @@ The test app UI must support:
    - Check permissions button
    - Show ✅/❌ indicators for each permission
 
-3. **Notification Testing**
+3. **Channel Management** (iOS parity with Android)
+   - Check channel status button (iOS: checks app-wide notification authorization)
+   - Open channel settings button (iOS: opens app Settings, not per-channel)
+   - Note: iOS doesn't have per-channel control like Android; these methods provide app-wide equivalents
+
+4. **Notification Testing**
    - Schedule test notification button
    - Display scheduled time
    - Show notification status
 
-4. **Status Display**
+5. **Status Display**
    - Show last notification time
    - Show pending notification count
    - Display error messages if any
@@ -101,12 +107,14 @@ The test app UI must support:
 | UI Element / Button | Plugin Method / API Call | Notes |
 |---------------------|-------------------------|-------|
 | "Check Plugin Status" | `DailyNotification.configure()` or status call | Verify plugin load & config |
-| "Check Permissions" | `getNotificationStatus()` | Maps to permission state |
-| "Request Permissions" | `requestPermissions()` | Drives iOS UNUserNotificationCenter |
+| "Check Permissions" | `checkPermissionStatus()` | Returns current notification permission status |
+| "Request Permissions" | `requestNotificationPermissions()` | Requests notification permissions (shows system dialog) |
 | "Schedule Test Notification" | `scheduleDailyNotification()` | Should schedule prefetch + notify |
 | "Show Last Notification" | `getLastNotification()` | Uses deterministic path (Bucket A) |
 | "Cancel All Notifications" | `cancelAllNotifications()` | Uses deterministic path (Bucket A) |
 | "Get Notification Status" | `getNotificationStatus()` | Uses deterministic path (Bucket A) |
+| "Check Channel Status" | `isChannelEnabled(channelId?)` | Checks if notifications enabled (iOS: app-wide) |
+| "Open Channel Settings" | `openChannelSettings(channelId?)` | Opens notification settings (iOS: app Settings) |
 
 **See `IOS_PREFETCH_TESTING.md` Behavior Classification for deterministic vs heuristic methods.**
 
@@ -291,7 +299,22 @@ e -l objc -- (void)[[BGTaskScheduler sharedScheduler] _simulateLaunchForTaskWith
    - Check notification category registered
    - **See also:** `IOS_PREFETCH_TESTING.md – Log Checklist: Section 4`
 
-3. **Build Failures:**
+3. **BGTaskScheduler Fails on Simulator:**
+   - **Expected Behavior:** BGTaskSchedulerErrorDomain Code=1 (notPermitted) is **normal on simulator**
+   - BGTaskScheduler doesn't work reliably on simulator - this is an iOS limitation, not a plugin bug
+   - Notification scheduling still works; prefetch won't run on simulator but will work on real devices
+   - Error handling logs clear message: "Background fetch scheduling failed (expected on simulator)"
+   - **See also:** `IOS_PREFETCH_TESTING.md – Known OS Limitations` for details
+   - **Testing:** Use Xcode → Debug → Simulate Background Fetch for simulator testing
+
+4. **Plugin Not Discovered:**
+   - Check plugin class conforms to `CAPBridgedPlugin` protocol (required for Capacitor discovery)
+   - Verify `@objc extension DailyNotificationPlugin: CAPBridgedPlugin` exists in plugin code
+   - Check plugin framework is force-loaded in AppDelegate before Capacitor initializes
+   - Verify `pluginMethods` array includes all `@objc` methods
+   - **See also:** `doc/directives/0003-iOS-Android-Parity-Directive.md – Plugin Discovery Issue` for detailed troubleshooting
+
+5. **Build Failures:**
    - Run `pod install`
    - Clean build folder (Cmd+Shift+K)
    - Verify Capacitor plugin path