Stereo recording with L/R level meters; optional Do Not Disturb while recording (1.2.0-alpha)

- WavRecorder: stereo capture with mono fallback, per-channel peak levels
- LevelMeterView: two-channel dBFS meter with peak hold and CLIP warning
- MainActivity: silence notifications/vibrations via Do Not Disturb
- Untrack large sherpa-onnx AAR and built APKs; note in TODO.md

1 files changed, 19 insertions, 5 deletions

diff --git a/README.md b/README.md
index 8b0e8ce..5aba434 100644
--- a/README.md
+++ b/README.md
@@ -3,8 +3,10 @@
 A minimal Android app that records uncompressed WAV audio and transcribes it
 on device.
 
-- **Format:** 44.1 kHz, 16-bit, mono, PCM (no compression)
+- **Format:** 44.1 kHz, 16-bit PCM (stereo when the device supports it), no compression
 - **Controls:** one big round button — tap to start recording (timer starts), tap again to stop and save
+- **Meters:** live left/right peak level meters with a clip indicator while recording
+- **Silence:** optional Do Not Disturb total silence (no notifications, no vibration) while recording
 - **Saving:** the WAV is written to the public **Downloads** folder as
   `reccoon-YYYY-MM-DD-HHMMSS-XXXXX.wav`, where `XXXXX` is a persistent
   5-digit progressive counter
@@ -13,7 +15,7 @@ on device.
 - **Transcription:** on-device, offline speech recognition with
   [sherpa-onnx](https://github.com/k2-fsa/sherpa-onnx) using multilingual
   Whisper — works with **English and Italian**
-- **Name:** RECCoon · **by** wuhei · **version** 1.1.0-alpha
+- **Name:** RECCoon · **by** wuhei · **version** 1.2.0-alpha
 - **Icon:** raccoon with a microphone
 
 ## Requirements
@@ -35,18 +37,30 @@ Outputs:
 - `app/build/outputs/apk/debug/app-debug.apk`
 - `app/build/outputs/apk/release/app-release.apk`
 
-A prebuilt copy is available at `dist/RECCoon-1.1.0-alpha.apk`.
+A prebuilt copy is available at `dist/RECCoon-1.2.0-alpha.apk`. Note that the
+sherpa-onnx AAR in `app/libs/` and the APK in `dist/` are **not** tracked in
+git because they are large; see `TODO.md`.
 
 ## Recording
 
-- `WavRecorder` uses `AudioRecord` (MIC source) to capture 16-bit PCM mono at
+- `WavRecorder` uses `AudioRecord` (MIC source) to capture 16-bit PCM at
   44100 Hz into a temporary file, then rewrites a correct 44-byte RIFF/WAVE
-  header when recording stops.
+  header when recording stops. It uses stereo when available and falls back to
+  mono, and reports per-channel peak levels to the UI.
 - `MainActivity` handles the runtime permissions, the timer, and copying the
   finished file into Downloads. On Android 10+ this uses `MediaStore`; on
   older versions it writes directly to the public Downloads directory and
   notifies the media scanner.
 
+## Level meters and silencing
+
+- `LevelMeterView` draws a two-channel peak meter (dBFS scale) with a decaying
+  peak hold and a red `CLIP` warning when a sample reaches full scale.
+- The **Silence notifications & vibrations while recording** checkbox switches
+  the phone to Do Not Disturb total silence while recording and restores the
+  previous setting on stop. It needs the `ACCESS_NOTIFICATION_POLICY`
+  permission, which the user grants in system settings when first enabled.
+
 ## Library and player
 
 - `RecordingsActivity` lists the `reccoon-*.wav` files in Downloads.