Add native Android app scaffold (M0): whisper.cpp engine via JNI
- android/: Gradle/Kotlin project (AGP 9.4, Compose, NDK 27.1), monorepo
subdir as planned; whisper.cpp v1.9.3 vendored via pinned fetch script
- core/whisper: JNI wrapper (beam size, threads, language) + WhisperEngine
Kotlin API mirroring the desktop engine contract
- app (M0 scope): in-app GGML model download from Hugging Face, engine
load, WAV picker with resampling, on-device transcription, share sheet
- build validated: assembleDebug OK, libwhisper_jni.so + ggml packaged
fegger
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