- Add Catch2 test framework with MockIO and TimeSimulator utilities
- Implement 10 TI for SchedulerModule (task lifecycle, hyperfocus, breaks)
- Implement 10 TI for NotificationModule (queue, priority, silent mode)
- Fix SchedulerModule: update m_lastActivityTime in process()
- Add AISSIA_TEST_BUILD guards to avoid symbol conflicts
- All 20 tests passing (69 assertions total)
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Co-Authored-By: Claude <noreply@anthropic.com>