docs: the phone client, and the Glyph traps worth not re-learning

The android README still described the app as unbuilt and pointed `glyph/libs/`
at a path that does not exist. It now covers what the app is made of, how to get
the SDK, and the three Glyph behaviours that cost an afternoon — two of which
fail with no exception and no log at all.

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

README.md

@@ -11,6 +11,7 @@ Three pieces, one backend:
 | **Backend** | FastAPI + Postgres: the clock, the task mirror, the blocking policy, the reports, the Telegram bot | Docker |
 | **Web app** | React + Material UI — the whole thing in a browser, on any device | Docker (same container) |
 | **Desktop app** | A **native Qt/QML** app: tray, D-Bus, real notifications, and the part that actually blocks websites and apps | Your machine |
+| **Android app** | A native Compose client for the Nothing Phone (3): the interval as an Android 16 Live Update, and the countdown on the rear Glyph Matrix | Your phone |
 
 The server owns the clock. Start a pomodoro on your phone's browser, watch it
 count down in the tray, finish it from the desktop — it is one interval.
@@ -212,6 +213,9 @@ and you can fill everything in from **Settings**.
   come from a separate, validated data palette: the brand is warm, but a chart
   has to stay readable for colour-blind readers in both themes.
 * `desktop/` — the native app. See [`desktop/README.md`](desktop/README.md).
+* `android/` — the phone client. Everything with interesting behaviour lives in a
+  plain-JVM `:core` module, so 225 tests run on a laptop with nothing but a JDK. See
+  [`android/README.md`](android/README.md).
 
 ---
 
@@ -225,6 +229,8 @@ make desktop          # run the native app from the checkout
 make desktop-install  # menu entry + icon
 make helper-install   # the privileged blocking helper
 make report           # build and send today's report right now
+make android-install  # build and install the phone client
+make deploy           # push master and redeploy kadence.timka.su
 ```
 
 The backend also has a CLI, handy from cron or a systemd timer: