Extract the storage layer into core/ (bundled in the integration)

Extract the storage layer into core/ (bundled in the integration)

tests/test_dao_rules.py

@@ -42,7 +42,7 @@ NOW = "2026-09-14T12:00:00+00:00"
 
 
 async def _prepare(path) -> tuple:
-    database = NestQuestDatabase(_make_hass_mock())
+    database = NestQuestDatabase(_make_hass_mock().async_add_executor_job)
     await database.open(path)
     await apply_migrations(database)
     rules = ScheduleRulesDao(database)
@@ -325,7 +325,7 @@ def test_rule_delete_concurrent_with_definition_create_is_safe(
     create's validation pauses mid-flight before the delete starts.
     """
     async def _main(order: str):
-        database = NestQuestDatabase(_make_hass_mock())
+        database = NestQuestDatabase(_make_hass_mock().async_add_executor_job)
         await database.open(tmp_path / f"rule-delete-race-{order}.db")
         try:
             await apply_migrations(database)
@@ -1218,12 +1218,12 @@ def test_rules_and_definitions_sql_lives_only_in_dao_module() -> None:
     scan_roots = [package, repo_root / "tests"]
 
     allowed = {
-        "custom_components/nestquest/dao_rules.py",  # this DAO
-        "custom_components/nestquest/dao_instances.py",  # validates the
+        "custom_components/nestquest/core/dao_rules.py",  # this DAO
+        "custom_components/nestquest/core/dao_instances.py",  # validates the
         # definition exists + fetches its assignee before generating an
         # instance (the instance must snapshot the definition's child)
-        "custom_components/nestquest/schema.py",  # declares the DDL
-        "custom_components/nestquest/migrations.py",  # applies the DDL
+        "custom_components/nestquest/core/schema.py",  # declares the DDL
+        "custom_components/nestquest/core/migrations.py",  # applies the DDL
         "tests/test_schema.py",  # tests the DDL
         "tests/test_migrations.py",  # tests migration application
         "tests/test_dao_rules.py",  # this file, scanned separately