docs: record the wedged-app failure mode and point Phase 7 at it

AGENTS.md

@@ -148,7 +148,10 @@ Open maps and search a place.
 *DoD:* the Hub calls `/act` and the phone responds.
 
 **Phase 7 — Resilience**
-Wake the screen, reconnect after a drop, fail cleanly on a missing element.
+Wake the screen, reconnect after a drop, fail cleanly on a missing element, and
+handle an app that stops consuming input (a memory-starved phone can deliver a
+tap that the app never acts on — see `docs/phase-3-spotify-recipe.md`, attempts
+9, 10 and 13).
 *DoD:* a dropped ADB session recovers without a restart.
 
 **Phase 8 — Documentation**

docs/phase-3-spotify-recipe.md

@@ -345,6 +345,36 @@ Artemis made this worse than it needed to be: `uiautomator dump` starts a JVM on
 the phone, and the wait helpers were polling every 400ms. `ui.PollInterval` is
 now 1500ms, which cuts that load by roughly two thirds.
 
+13. **A second query met the wedged app again.** Straight after the successful
+    run, `spotify_play query="Beatles Hey Jude"` failed at the clear-the-search-box
+    step: the app never acted on the tap, and a 90-second rest did not clear it.
+    Not a recipe fault — the same wedge as attempts 9 and 10, and this time the
+    evidence is complete:
+
+    ```
+    $ adb shell input motionevent DOWN 993 186
+    $ adb shell dumpsys input | sed -n '/Input Dispatcher State/,/Input Reader State/p'
+      TouchStatesByDisplay:
+        LogicalDisplayId 0:
+          TouchedWindows:
+            0: name='44f7f5b com.spotify.music/com.spotify.music.MainActivity',
+               targetFlags=FOREGROUND | SPLIT   ... FINGER
+
+    $ adb shell dumpsys activity lastanr | tail -2
+      <no ANR has occurred since boot>
+    $ adb shell ps -A -o PID,NAME,%CPU | grep spotify
+      11987 com.spotify.music  41.5
+    $ adb shell grep -E 'MemFree|SwapFree' /proc/meminfo
+      MemFree:  253508 kB
+      SwapFree: 338264 kB
+    ```
+
+    The touch reaches Spotify's window; the app does not consume it; Android has
+    not declared an ANR; the phone has 250MB free and has used 3.5GB of its 3.9GB
+    swap. The first run of the heartbeat, from a quieter phone, completed in 35
+    seconds. This is the phone's resource state, not the recipe, and detecting
+    "the app has stopped taking input" belongs to Phase 7 (resilience).
+
 ### Reproducing it
 
 ```sh