Configure audio attributes before MediaPlayer preparation, keep vibration independent from sound failures, and guard loop/focus cleanup against stale callbacks. Preserve ringback players on repeated phase requests.
Add 35 alert lifecycle tests against real Kotlin sources with controlled Android API failures. Validation: 328 JVM tests, assembleDebug, core build, and full check.sh (225 tests plus proxy/burst/load) passed. Previous sources fail 32 of the 35 new cases.
evgeny
5a6eabf4fc