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Adds nativeWriteAudioDirect / nativeReadAudioDirect JNI functions that accept a DirectByteBuffer instead of ShortArray. The buffer's native memory is accessed directly by Rust via pointer — no GetShortArrayRegion / SetShortArrayRegion, no GC-managed array copies on the audio hot path. This fixes SIGBUS crashes on Android 16 where ART's concurrent mark-compact GC crashes when flipping thread roots during JNI array operations on MAX_PRIORITY audio threads. Old ShortArray methods kept for backward compatibility. AudioPipeline switched to use Direct variants. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>