feat(connection): ADB foreground fallback on the watchdog cadence when the protocol push is silent (store priority protocol > ADB); audio-playback hint filtered through SYSTEM_MEDIA_PACKAGES (P3-2b,c)

custom_components/nvidia_shield/adb_session.py

@@ -16,6 +16,7 @@ import logging
 from .ha_adb_common import (
     AdbClientBase,
     MediaSessionInfo,  # noqa: F401  (re-export)
+    parse_foreground,
 )
 from .ha_adb_common import ensure_adb_key as _ensure_adb_key
 
@@ -43,3 +44,13 @@ class AdbMediaSessionPoller(AdbClientBase):
                 prefer its media session over stale sessions from other apps.
         """
         return await self.poll_media_sessions(foreground_package)
+
+    async def poll_foreground(self) -> str | None:
+        """Foreground package via `dumpsys activity activities` (RESEARCH R4).
+
+        The grep keeps the dump tiny; the parser handles the R4 line wrap.
+        """
+        dump = await self.shell("dumpsys activity activities 2>/dev/null | grep -iE 'resumed'")
+        if not dump:
+            return None
+        return parse_foreground(dump)