fix(media_player): the adb_command participant registry key is computed once at registration and stored on the entity — add/remove always match (F4)

tests/entity_stublib.py

@@ -31,6 +31,7 @@ ENTITIES_STUB_NAMES = (
     "nsh.power",
     "nsh.jellyfin",
     "nsh.media_player",
+    "nsh.diagnostics",
     "nsh.remote",
 )
 
@@ -206,12 +207,12 @@ def load_entity_modules() -> dict:
     install()
     from conftest import _SHIELD_DIR, _load_module
 
-    for name in ("helpers", "power", "jellyfin", "media_player", "remote"):
+    for name in ("helpers", "power", "jellyfin", "media_player", "remote", "diagnostics"):
         if f"nsh.{name}" not in sys.modules:
             _load_module(f"nsh.{name}", _SHIELD_DIR / f"{name}.py")
     return {
         name: sys.modules[f"nsh.{name}"]
-        for name in ("power", "jellyfin", "media_player", "remote")
+        for name in ("power", "jellyfin", "media_player", "remote", "diagnostics")
     }