Android launcher: drop process-group reaping; orphan recovery stops only the app's own container

Matching the APK path in command lines could hit an unrelated process, and
the pgid file had a registration race. The launcher keeps the flock (not
inherited by Lepton) and, holding it, stops only lepton-steamlaunch-<instance>,
whose name is this app's alone. A Lepton host process may linger briefly.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

frame/android/lepton-app.sh

@@ -30,22 +30,10 @@ fi
 exec 9>"$DIR/launch.lock"
 flock -n 9 || { echo "Android app is already running" >&2; exit 1; }
 CONTAINER="lepton-steamlaunch-$SteamAppId"
-# Lepton doesn't hold the lock, so a launcher SIGKILLed before Lepton made its
-# container leaves a Lepton that nothing tracks: end that process group first.
-# Only a group still running this app.apk, never an unrelated reused id.
-PGID_FILE="$DIR/launch.pgid"
-if [[ -f "$PGID_FILE" ]]; then
-  old="$(cat "$PGID_FILE")"
-  if [[ "$old" =~ ^[0-9]+$ ]] && ps -A -o pgid=,args= | awk -v g="$old" '$1 == g' | grep -qF -- "$DIR/app.apk"; then
-    echo "Stopping the previous launch (process group $old)" >&2
-    kill -TERM -- "-$old" 2>/dev/null || true
-    for _ in 1 2 3 4 5 6 7 8 9 10; do kill -0 -- "-$old" 2>/dev/null || break; sleep 0.5; done
-    kill -KILL -- "-$old" 2>/dev/null || true
-  fi
-  rm -f "$PGID_FILE"
-fi
 # Holding the lock means no launcher owns a running container: it was orphaned
-# (this script SIGKILLed), so stop it rather than refuse every later Play.
+# (this script SIGKILLed), so stop it rather than refuse every later Play. The
+# name is this app's alone. A Lepton host process whose launcher was killed
+# before it made the container may linger briefly; nothing else is killed.
 if [[ "$(podman inspect --format '{{.State.Running}}' "$CONTAINER" 2>/dev/null || true)" == true ]]; then
   echo "Stopping orphaned $CONTAINER" >&2
   podman stop -t 5 "$CONTAINER" >/dev/null 2>&1 || true
@@ -74,7 +62,6 @@ cleanup() {
     kill -KILL "$child" 2>/dev/null || true
     wait "$child" 2>/dev/null || true
   fi
-  rm -f "$PGID_FILE"
 }
 trap cleanup EXIT
 trap 'exit 143' TERM
@@ -83,7 +70,6 @@ trap 'exit 129' HUP
 # 9>&-: the lock is this launcher's alone; Lepton's tree mustn't keep it held.
 setsid --wait "$LEPTON" waitforexitandrun -- "$DIR/app.apk" 9>&- &
 child=$!
-echo "$child" > "$PGID_FILE"
 rc=0
 wait "$child" || rc=$?
 child=""