fix: flow VERSION=2 for new entries; optional ENTER gains the ADB keyevent-66 fallback; CI installs androidtvremote2 for the real-library tests (F4, F5, F6)

custom_components/nvidia_shield/media_player.py

@@ -834,9 +834,15 @@ class NvidiaShieldMediaPlayer(MediaPlayerEntity):
                         media={"media_content_id": digit, "media_content_type": "channel"},
                     )
                 await asyncio.sleep(delay)
-            if send_enter:
-                _LOGGER.debug("play_media(channel): optional ENTER key sent")
-                await self._manager.send_protocol_key("KEYCODE_ENTER")
+            if (
+                send_enter
+                and self._manager is not None
+                and not await self._manager.send_protocol_key("KEYCODE_ENTER")
+            ):
+                # ENTER fallback chain: protocol key → ADB keyevent 66.
+                # (No legacy-entity tier: the external androidtv_remote has
+                # no ENTER service to delegate to.)
+                await self._manager.send_enter_key()
         except asyncio.CancelledError:
             raise