fix: preserve GPUI lifetime and avoid WASAPI silence warnings

scripts/validate/linux-rig.sh

@@ -128,6 +128,26 @@ else
     result "${name}" 1
 fi
 
+# 10. Silence is healthy: no playback streams, idle >10s before monitor capture.
+for mode in silence muted-mic; do
+    name="audio-${mode}"
+    mic=""
+    setup=""
+    if [[ "${mode}" == muted-mic ]]; then
+        mic="--mic"
+        setup="pactl set-default-source clipbin-rig-sink.monitor; pactl set-source-mute clipbin-rig-sink.monitor 1;"
+    fi
+    CLIPBIN_RIG_NO_AUDIO=1 "${rig}" bash -c "sleep 12; test -z \"\$(pactl list short sink-inputs)\" || exit 1; pactl list short sinks | grep SUSPENDED || exit 1; ${setup} '${probe}' record ${mic} --seconds 16 --out '${out}/${name}'; status=\$?; pactl list short sinks; exit \$status" \
+        > "${out}/${name}.log" 2>&1
+    probe_exit=$?
+    if [[ "${probe_exit}" == 0 ]] && has "${out}/${name}.log" "status=Recording" \
+        && ! has "${out}/${name}.log" "status=(degraded|failed)"; then
+        result "${name}" 0 "no playback for >10s, capture remains healthy"
+    else
+        result "${name}" 1
+    fi
+done
+
 echo
 if [[ "${failures}" == 0 ]]; then
     echo "All scenarios passed. Logs in ${out}"