Oboe fails silently to open the AAudio input stream without
android.permission.RECORD_AUDIO, so the call audio would never actually
flow even after phase 3's engine wiring.
- AndroidManifest.xml: declare RECORD_AUDIO and MODIFY_AUDIO_SETTINGS, and
android.hardware.microphone as a required feature. These files are the
cargo-tauri-generated scaffold — nothing in .gitignore excludes them, so
the intended Tauri 2 mobile workflow is to commit them once populated.
- MainActivity.kt: override onCreate to call ActivityCompat.requestPermissions
for the audio perms on first launch. The dialog shows exactly once; the
grant is persisted per-package. onRequestPermissionsResult logs the
outcome so we can spot failures in logcat.
A full native Tauri permission plugin integration is deferred to
Step 6 (polish) together with notifications, icon, and background service.
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