feat: adb_command is a conforming action — always registered in async_setup (option gates USE), services.yaml with required command/entity, strings services+exceptions, ServiceValidationError on empty/unknown-target/ADB-down; participant registry stays (t29 G8)

tests/entity_stublib.py

@@ -15,6 +15,7 @@ ENTITIES_STUB_NAMES = (
     "voluptuous",
     "homeassistant",
     "homeassistant.config_entries",
+    "homeassistant.exceptions",
     "homeassistant.core",
     "homeassistant.const",
     "homeassistant.components",
@@ -134,6 +135,17 @@ def install() -> None:
     config_entries.OptionsFlow = type("OptionsFlow", (), {})
     sys.modules["homeassistant.config_entries"] = config_entries
 
+    exceptions = types.ModuleType("homeassistant.exceptions")
+
+    class ServiceValidationErrorStubError(Exception):
+        def __init__(self, *args, **kwargs):
+            super().__init__(*args or (kwargs.get("translation_key"),))
+            self.translation_domain = kwargs.get("translation_domain")
+            self.translation_key = kwargs.get("translation_key")
+
+    exceptions.ServiceValidationError = ServiceValidationErrorStubError
+    sys.modules["homeassistant.exceptions"] = exceptions
+
     core = types.ModuleType("homeassistant.core")
     core.HomeAssistant = object
     core.callback = lambda fn: fn
@@ -216,9 +228,20 @@ def load_entity_modules() -> dict:
     install()
     from conftest import _SHIELD_DIR, _load_module
 
-    for name in ("helpers", "power", "jellyfin", "media_player", "remote", "diagnostics"):
+    for name in (
+        "helpers",
+        "power",
+        "jellyfin",
+        "media_player",
+        "remote",
+        "diagnostics",
+        "init",
+    ):  # "init" maps the integration __init__.py (t29 G8 async_setup)
+        if name == "init" and "nsh.init" in sys.modules:
+            continue
         if f"nsh.{name}" not in sys.modules:
-            _load_module(f"nsh.{name}", _SHIELD_DIR / f"{name}.py")
+            file_name = "__init__.py" if name == "init" else f"{name}.py"
+            _load_module(f"nsh.{name}", _SHIELD_DIR / file_name)
     return {
         name: sys.modules[f"nsh.{name}"]
         for name in ("power", "jellyfin", "media_player", "remote", "diagnostics")