semantics: complete DEF-to-region migration, fix regressions

- Convert legacy [DEF🆔Type] anchors to #region/#endregion across 329 files
- Reinstate _normalize_timestamp_value in sql_generator.py
- Fix MarkerLogger→logger migration in events.py (molecular CoT markers)
- Fix dataset_review orchestrator dependencies (_build_execution_snapshot)
- Fix config_manager stale-record deletion (moved to save path only)
- Add 77 missing [/DEF:] closers in 5 unbalanced test files
- Update assistant_chat.integration.test.js for #region format
- Apply molecular-cot-logging markers (REASON/REFLECT/EXPLORE) via logger.* methods

backend/src/core/auth/config.py

@@ -1,21 +1,19 @@
 # #region AuthConfigModule [C:2] [TYPE Module] [SEMANTICS auth, config, settings, jwt, adfs]
+#
 # @BRIEF Centralized configuration for authentication and authorization.
-# @LAYER Core
-# @INVARIANT All sensitive configuration must have defaults or be loaded from environment.
-# @RELATION DEPENDS_ON -> [pydantic]
-#
+# @LAYER:     Core
+# @RELATION DEPENDS_ON -> pydantic
 #
+# @INVARIANT: All sensitive configuration must have defaults or be loaded from environment.
 
-# [SECTION: IMPORTS]
 from pydantic import Field
 from pydantic_settings import BaseSettings
-# [/SECTION]
 
 # #region AuthConfig [TYPE Class]
 # @BRIEF Holds authentication-related settings.
-# @PRE Environment variables may be provided via .env file.
-# @POST Returns a configuration object with validated settings.
-# @RELATION INHERITS -> [pydantic_settings.BaseSettings]
+# @PRE:     Environment variables may be provided via .env file.
+# @POST:    Returns a configuration object with validated settings.
+# @RELATION INHERITS -> pydantic_settings.BaseSettings
 class AuthConfig(BaseSettings):
     # JWT Settings
     SECRET_KEY: str = Field(default="super-secret-key-change-in-production", env="AUTH_SECRET_KEY")
@@ -41,7 +39,7 @@ class AuthConfig(BaseSettings):
 
 # #region auth_config [TYPE Variable]
 # @BRIEF Singleton instance of AuthConfig.
-# @RELATION DEPENDS_ON -> [AuthConfig]
+# @RELATION DEPENDS_ON -> AuthConfig
 auth_config = AuthConfig()
 # #endregion auth_config