Add iOS prefetch testing guide with detailed procedures, log checklists,
and behavior classification. Enhance iOS test app requirements with
security constraints, sign-off checklists, and changelog structure.
Update main directive with testing strategy and method behavior mapping.
Changes:
- Add IOS_PREFETCH_TESTING.md with simulator/device test plans, log
diagnostics, telemetry expectations, and test run templates
- Add DailyNotificationBackgroundTaskTestHarness.swift as reference
implementation for BGTaskScheduler testing
- Enhance IOS_TEST_APP_REQUIREMENTS.md with security/privacy constraints,
review checklists, CI hints, and glossary cross-links
- Update 0003-iOS-Android-Parity-Directive.md with testing strategy
section, method behavior classification, and validation matrix updates
All documents now include changelog stubs, cross-references, and
completion criteria for Phase 1 implementation and testing.
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