test(init): tests/test_init.py lands — domain async_setup units + YAML seed parsing/normalization, flow-init seeding records, hostless drop, duplicate guards (UI host + virtual unique_id) and single-visit interactive routing; scoped stub hygiene mirrors scoped_stubs (t30 G6/U1)

tests/entity_stublib.py

@@ -113,6 +113,12 @@ def install() -> None:
     """Register the stub modules (idempotent)."""
     if "homeassistant.components.media_player" in sys.modules:
         return
+    # honor per-file flow stub versions already in place (e.g. the
+    # config-flow/pairing/protocol files) — the hub's base would strip the
+    # base plumbing the flow tests already installed (t30 leak).
+    ce = sys.modules.get("homeassistant.config_entries")
+    if ce is not None and hasattr(ce, "OptionsFlowWithReload"):
+        return
 
     vol = types.ModuleType("voluptuous")
     vol.Required = lambda key, default=None: key
@@ -191,6 +197,7 @@ def install() -> None:
             return {"type": "create_entry", "title": title, "data": data}
 
     config_entries.OptionsFlow = _OptionsFlowStub
+    config_entries.SOURCE_IMPORT = "import"
     config_entries.OptionsFlowWithReload = _OptionsFlowWithReload
     sys.modules["homeassistant.config_entries"] = config_entries