Meditation timer: gong service, wheel picker, history + health sync, Gitea CI

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

README.md

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+# Meditation Timer
+
+Jhana meditation timer for GrapheneOS. Start/end gong, scroll-wheel duration
+picker (presets 20/45/60/90), session history with depth rating + notes, and
+sync to the meditation dashboard at health.rehbock.xyz/meditation.html.
+
+## Pipeline
+
+Push to `main` on [git.rehbock.xyz](https://git.rehbock.xyz/marcus/meditation-timer)
+→ Gitea Actions builds a signed release APK → published as a Gitea release
+→ Obtainium on the phone picks up the new version.
+
+## Sync
+
+Sessions POST to `https://meditation.rehbock.xyz/v1/sessions` (health-api).
+The bearer token is **not** in this repo or the APK — set it once in-app
+(History → Token) or seed it via:
+
+```
+adb shell am start -n com.marcus.meditationtimer/.MainActivity --es sync_token "<token>"
+```
+
+Sessions shorter than 30 seconds are not recorded (gong tests).
+
+## Local build
+
+```
+./gradlew assembleDebug   # needs ANDROID_HOME or local.properties
+```
+
+Release signing (CI): secrets `KEYSTORE_B64` + `KEYSTORE_PASSWORD`; key alias
+`meditation`. Keystore master copy: `~/.android-keys/` on the desktop.
+
+## Gong
+
+`app/src/main/res/raw/gong.wav` is synthesized (singing-bowl partials,
+detuned fundamental pair for beating). Regenerate with the script in the
+repo history / scratchpad if the tone needs tweaking.