docs: add comprehensive testing infrastructure for P0 features
- Add comprehensive-testing-guide-v2.md with detailed test procedures
- Add testing-quick-reference-v2.md for quick access to test commands
- Add reboot-test-v2.sh for automated reboot testing
- Covers all P0 production-grade features:
* Channel management (P0 Priority 1)
* PendingIntent flags & exact alarms (P0 Priority 2)
* JIT freshness re-check (P0 Priority 3)
* Recovery coexistence (P0 Priority 4)
- Includes manual and automated testing procedures
- Ready for comprehensive test run after P0 completion
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