feat(docs): complete P2.6 type safety cleanup and P2.7 system invariants
P2.6: Type Safety Cleanup - Replaced 'any' return types in vite-plugin.ts with concrete types (UserConfig, transform return type) - Documented TypeScript mixin 'any[]' exception in PlatformServiceMixin.ts - Audit confirmed: zero 'any' in codebase except documented TS mixin limitation - All external boundaries use 'unknown', all data payloads use 'Record<string, unknown>' P2.7: System Invariants Documentation - Created SYSTEM_INVARIANTS.md documenting all 6 enforced invariants - Added to docs/00-INDEX.md under Policy & Contracts section - Each invariant includes: What, Why, How, Where Progress Docs Updates: - Updated 00-STATUS.md: marked P2.6/P2.7 complete, added type safety invariant note - Updated 01-CHANGELOG-WORK.md: added 2025-12-22 entries for P2.6/P2.7 - Updated 03-TEST-RUNS.md: added P2.6 type safety audit test run - Updated P2-DESIGN.md: marked P2.6 acceptance criteria complete - Updated SYSTEM_INVARIANTS.md: added Type Safety Notes section Baseline Tag: - Created v1.0.11-p0-p1.4-p1.5-p2.6-p2.7-complete TypeScript compilation: ✅ PASSES Build: ✅ PASSES CI: ✅ All checks pass
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Matthew Raymer
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# iOS Prefetch Plugin Testing and Validation Enhancements - Applied
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**Date:** 2025-11-15
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**Status:** ✅ Applied to codebase
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**Directive Source:** User-provided comprehensive enhancement directive
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## Summary
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This document tracks the application of comprehensive enhancements to the iOS prefetch plugin testing and validation system. All improvements from the directive have been systematically applied to the codebase.
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---
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## 1. Technical Correctness Improvements ✅
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### 1.1 Robust BGTask Scheduling & Lifecycle
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**Applied to:** `ios/Plugin/DailyNotificationBackgroundTaskTestHarness.swift`
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**Enhancements:**
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- ✅ **Validation of Scheduling Conditions:** Added validation to ensure `earliestBeginDate` is at least 60 seconds in future (iOS requirement)
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- ✅ **Simulator Error Handling:** Added graceful handling of Code=1 error (expected on simulator) with clear logging
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- ✅ **One Active Task Rule:** Implemented `cancelPendingTask()` method to enforce only one prefetch task per notification
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- ✅ **Debug Verification:** Added `verifyOneActiveTask()` helper method to verify only one task is pending
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- ✅ **Schedule Next Task at Execution:** Updated handler to schedule next task IMMEDIATELY at start (Apple best practice)
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- ✅ **Expiration Handler:** Enhanced expiration handler to ensure task completion even on timeout
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- ✅ **Completion Guarantee:** Added guard to ensure `setTaskCompleted()` is called exactly once
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- ✅ **Error Handling:** Enhanced error handling with proper logging and fallback behavior
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**Code Changes:**
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- Enhanced `schedulePrefetchTask()` with validation and one-active-task rule
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- Updated `handlePrefetchTask()` to follow Apple's best practice pattern
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- Added `cancelPendingTask()` and `verifyOneActiveTask()` methods
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- Improved `PrefetchOperation` with failure tracking
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### 1.2 Enhanced Scheduling and Notification Coordination
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**Applied to:** Documentation in `IOS_TEST_APP_REQUIREMENTS.md`
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**Enhancements:**
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- ✅ Added "Technical Correctness Requirements" section
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- ✅ Documented unified scheduling logic requirements
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- ✅ Documented BGTask identifier constant verification
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- ✅ Documented concurrency considerations for Phase 2
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- ✅ Documented OS limits and tolerance expectations
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---
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## 2. Testing Coverage Expansion ✅
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### 2.1 Edge Case Scenarios and Environment Conditions
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**Applied to:** `doc/test-app-ios/IOS_PREFETCH_TESTING.md`
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**Enhancements:**
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- ✅ **Expanded Edge Case Table:** Added comprehensive table with 7 scenarios:
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- Background Refresh Off
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- Low Power Mode On
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- App Force-Quit
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- Device Timezone Change
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- DST Transition
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- Multi-Day Scheduling (Phase 2)
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- Device Reboot
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- ✅ **Test Strategy:** Each scenario includes test strategy and expected outcome
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- ✅ **Additional Variations:** Documented battery vs plugged, force-quit vs backgrounded, etc.
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### 2.2 Failure Injection and Error Handling Tests
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**Applied to:** `doc/test-app-ios/IOS_PREFETCH_TESTING.md` and `IOS_TEST_APP_REQUIREMENTS.md`
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**Enhancements:**
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- ✅ **Expanded Negative-Path Tests:** Added 8 new failure scenarios:
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- Storage unavailable
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- JWT expiration
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- Timezone drift
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- Corrupted cache
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- BGTask execution failure
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- Repeated scheduling calls
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- Permission revoked mid-run
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- ✅ **Error Handling Section:** Added comprehensive error handling test cases to test app requirements
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- ✅ **Expected Outcomes:** Each failure scenario includes expected plugin behavior
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### 2.3 Automated Testing Strategies
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**Applied to:** `doc/test-app-ios/IOS_PREFETCH_TESTING.md`
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**Enhancements:**
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- ✅ **Unit Tests Section:** Added comprehensive unit test strategy:
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- Time calculations
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- TTL validation
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- JSON mapping
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- Permission check flow
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- BGTask scheduling logic
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- ✅ **Integration Tests Section:** Added integration test strategies:
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- Xcode UI Tests
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- Log sequence validation
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- Mocking and dependency injection
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- ✅ **BGTask Expiration Coverage:** Added test strategy for expiration handler
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---
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## 3. Validation and Verification Enhancements ✅
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### 3.1 Structured Logging and Automated Log Analysis
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**Applied to:** `doc/test-app-ios/IOS_PREFETCH_TESTING.md`
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**Enhancements:**
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- ✅ **Structured Log Output (JSON):** Added JSON schema examples for:
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- Success events
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- Failure events
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- Cycle complete summary
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- ✅ **Log Validation Script:** Added complete `validate-ios-logs.sh` script with:
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- Sequence marker detection
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- Automated validation logic
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- Usage instructions
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- ✅ **Distinct Log Markers:** Documented log marker requirements
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### 3.2 Enhanced Verification Signals
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**Applied to:** `doc/test-app-ios/IOS_PREFETCH_TESTING.md` and `IOS_TEST_APP_REQUIREMENTS.md`
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**Enhancements:**
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- ✅ **Telemetry Counters:** Documented all expected counters:
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- `dnp_prefetch_scheduled_total`
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- `dnp_prefetch_executed_total`
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- `dnp_prefetch_success_total`
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- `dnp_prefetch_failure_total{reason="NETWORK|AUTH|SYSTEM"}`
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- `dnp_prefetch_used_for_notification_total`
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- ✅ **State Integrity Checks:** Added verification methods:
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- Content hash verification
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- Schedule hash verification
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- Persistence verification
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- ✅ **Persistent Test Artifacts:** Added JSON schema for test run artifacts
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- ✅ **UI Indicators:** Added requirements for status display and operation summary
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- ✅ **In-App Log Viewer:** Documented Phase 2 enhancement for QA use
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### 3.3 Test Run Result Template Enhancement
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**Applied to:** `doc/test-app-ios/IOS_PREFETCH_TESTING.md`
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**Enhancements:**
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- ✅ **Enhanced Template:** Added fields for:
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- Actual execution time vs scheduled
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- Telemetry counters
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- State verification (content hash, schedule hash, cache persistence)
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- ✅ **Persistent Artifacts:** Added note about test app saving summary to file
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---
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## 4. Documentation Updates ✅
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### 4.1 Test App Requirements
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**Applied to:** `doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md`
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**Enhancements:**
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- ✅ **Technical Correctness Requirements:** Added comprehensive section covering:
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- BGTask scheduling & lifecycle
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- Scheduling and notification coordination
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- ✅ **Error Handling Expansion:** Added 7 new error handling test cases
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- ✅ **UI Indicators:** Added requirements for status display, operation summary, and dump prefetch status
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- ✅ **In-App Log Viewer:** Documented Phase 2 enhancement
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- ✅ **Persistent Schedule Snapshot:** Enhanced with content hash and schedule hash fields
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### 4.2 Testing Guide
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**Applied to:** `doc/test-app-ios/IOS_PREFETCH_TESTING.md`
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**Enhancements:**
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- ✅ **Edge Case Scenarios Table:** Comprehensive table with test strategies
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- ✅ **Failure Injection Tests:** 8 new negative-path scenarios
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- ✅ **Automated Testing Strategies:** Complete unit and integration test strategies
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- ✅ **Validation Enhancements:** Log validation script, structured logging, verification signals
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- ✅ **Test Run Template:** Enhanced with telemetry and state verification fields
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---
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## 5. Code Enhancements ✅
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### 5.1 Test Harness Improvements
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**File:** `ios/Plugin/DailyNotificationBackgroundTaskTestHarness.swift`
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**Changes:**
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- Enhanced `schedulePrefetchTask()` with validation and one-active-task enforcement
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- Added `cancelPendingTask()` method
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- Added `verifyOneActiveTask()` debug helper
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- Updated `handlePrefetchTask()` to follow Apple best practices
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- Enhanced `PrefetchOperation` with failure tracking
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- Improved error handling and logging throughout
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**Key Features:**
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- Validates minimum 60-second lead time
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- Enforces one active task rule
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- Handles simulator limitations gracefully
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- Schedules next task immediately at execution start
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- Ensures task completion even on expiration
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- Prevents double completion
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---
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## 6. Files Modified
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1. ✅ `ios/Plugin/DailyNotificationBackgroundTaskTestHarness.swift` - Enhanced with technical correctness improvements
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2. ✅ `doc/test-app-ios/IOS_PREFETCH_TESTING.md` - Expanded testing coverage and validation enhancements
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3. ✅ `doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md` - Added technical correctness requirements and enhanced error handling
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---
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## 7. Next Steps
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### Immediate (Phase 1)
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- [ ] Implement actual prefetch logic using enhanced test harness as reference
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- [x] Create `validate-ios-logs.sh` script ✅ **COMPLETE** - Script created at `scripts/validate-ios-logs.sh`
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- [ ] Add UI indicators to test app
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- [ ] Implement persistent test artifacts export
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### Phase 2
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- [ ] Wire telemetry counters to production pipeline
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- [ ] Implement in-app log viewer
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- [ ] Add automated CI pipeline integration
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- [ ] Test multi-day scenarios with varying TTL values
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---
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## 8. Validation Checklist
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- [x] Technical correctness improvements applied to test harness
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- [x] Edge case scenarios documented with test strategies
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- [x] Failure injection tests expanded
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- [x] Automated testing strategies documented
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- [x] Structured logging schema defined
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- [x] Log validation script provided ✅ **COMPLETE** - Script created at `scripts/validate-ios-logs.sh`
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- [x] Enhanced verification signals documented
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- [x] Test run template enhanced
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- [x] Documentation cross-referenced and consistent
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- [x] Code follows Apple best practices
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---
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## References
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- **Main Directive:** `doc/directives/0003-iOS-Android-Parity-Directive.md`
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- **Testing Guide:** `doc/test-app-ios/IOS_PREFETCH_TESTING.md`
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- **Test App Requirements:** `doc/test-app-ios/IOS_TEST_APP_REQUIREMENTS.md`
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- **Test Harness:** `ios/Plugin/DailyNotificationBackgroundTaskTestHarness.swift`
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- **Glossary:** `doc/test-app-ios/IOS_PREFETCH_GLOSSARY.md`
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---
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**Status:** All enhancements from the directive have been systematically applied to the codebase. The plugin is now ready for Phase 1 implementation with comprehensive testing and validation infrastructure in place.
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