feat(robustness+ui): отказоустойчивость main, тесты, a11y-полировка, лицензия

Надёжность main-процесса:
- глобальные uncaughtException/unhandledRejection (лог + flushNow)
- safeHandle/safeOn вокруг всех IPC-хендлеров (не падаем молча, generic-ошибка наружу)
- таймаут 4s на tasklist, Atomics.wait вместо busy-spin на exit-записи
- единый log.error для фоновых сбоев вместо console.error/тишины

Тесты (178 -> 203): meeting-detect, scheduler-gating, store (миграции/карантин/cap).

UI/UX:
- prefers-reduced-motion через MotionConfig + CSS media-блок
- Spinner/Skeleton примитивы, loading-состояния вместо пустых заглушек
- aria-live анонсы достижений и выполнения (useAnnounce)
- оформленные пустые состояния, клавиатура в меню ExerciseCard

Лицензия: проприетарный LICENSE + правка README/CLAUDE.md, счётчик тестов.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

LICENSE

@@ -0,0 +1,49 @@
+Exercise Reminder (Laude)
+Proprietary Software License
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