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/plugins/backup.py

@@ -1,10 +1,10 @@
 # #region BackupPlugin [TYPE Module] [SEMANTICS backup, superset, automation, dashboard, plugin]
 # @BRIEF A plugin that provides functionality to back up Superset dashboards.
-# @LAYER App
-# @RELATION IMPLEMENTS -> [PluginBase]
-# @RELATION DEPENDS_ON -> [superset_tool.client]
-# @RELATION DEPENDS_ON -> [superset_tool.utils]
-# @RELATION USES -> [TaskContext]
+# @LAYER: App
+# @RELATION IMPLEMENTS -> PluginBase
+# @RELATION DEPENDS_ON -> superset_tool.client
+# @RELATION DEPENDS_ON -> superset_tool.utils
+# @RELATION USES -> TaskContext
 
 from typing import Dict, Any, Optional
 from pathlib import Path
@@ -33,63 +33,63 @@ class BackupPlugin(PluginBase):
     """
 
     @property
-    # #region id [TYPE Function]
-    # @BRIEF Returns the unique identifier for the backup plugin.
-    # @PRE Plugin instance exists.
-    # @POST Returns string ID.
-    # @RETURN str - "superset-backup"
+    # [DEF:id:Function]
+    # @PURPOSE: Returns the unique identifier for the backup plugin.
+    # @PRE: Plugin instance exists.
+    # @POST: Returns string ID.
+    # @RETURN: str - "superset-backup"
     def id(self) -> str:
         with belief_scope("id"):
             return "superset-backup"
-    # #endregion id
+    # [/DEF:id:Function]
 
     @property
-    # #region name [TYPE Function]
-    # @BRIEF Returns the human-readable name of the backup plugin.
-    # @PRE Plugin instance exists.
-    # @POST Returns string name.
-    # @RETURN str - Plugin name.
+    # [DEF:name:Function]
+    # @PURPOSE: Returns the human-readable name of the backup plugin.
+    # @PRE: Plugin instance exists.
+    # @POST: Returns string name.
+    # @RETURN: str - Plugin name.
     def name(self) -> str:
         with belief_scope("name"):
             return "Superset Dashboard Backup"
-    # #endregion name
+    # [/DEF:name:Function]
 
     @property
-    # #region description [TYPE Function]
-    # @BRIEF Returns a description of the backup plugin.
-    # @PRE Plugin instance exists.
-    # @POST Returns string description.
-    # @RETURN str - Plugin description.
+    # [DEF:description:Function]
+    # @PURPOSE: Returns a description of the backup plugin.
+    # @PRE: Plugin instance exists.
+    # @POST: Returns string description.
+    # @RETURN: str - Plugin description.
     def description(self) -> str:
         with belief_scope("description"):
             return "Backs up all dashboards from a Superset instance."
-    # #endregion description
+    # [/DEF:description:Function]
 
     @property
-    # #region version [TYPE Function]
-    # @BRIEF Returns the version of the backup plugin.
-    # @PRE Plugin instance exists.
-    # @POST Returns string version.
-    # @RETURN str - "1.0.0"
+    # [DEF:version:Function]
+    # @PURPOSE: Returns the version of the backup plugin.
+    # @PRE: Plugin instance exists.
+    # @POST: Returns string version.
+    # @RETURN: str - "1.0.0"
     def version(self) -> str:
         with belief_scope("version"):
             return "1.0.0"
-    # #endregion version
+    # [/DEF:version:Function]
 
     @property
-    # #region ui_route [TYPE Function]
-    # @BRIEF Returns the frontend route for the backup plugin.
-    # @RETURN str - "/tools/backups"
+    # [DEF:ui_route:Function]
+    # @PURPOSE: Returns the frontend route for the backup plugin.
+    # @RETURN: str - "/tools/backups"
     def ui_route(self) -> str:
         with belief_scope("ui_route"):
             return "/tools/backups"
-    # #endregion ui_route
+    # [/DEF:ui_route:Function]
 
-    # #region get_schema [TYPE Function]
-    # @BRIEF Returns the JSON schema for backup plugin parameters.
-    # @PRE Plugin instance exists.
-    # @POST Returns dictionary schema.
-    # @RETURN Dict[str, Any] - JSON schema.
+    # [DEF:get_schema:Function]
+    # @PURPOSE: Returns the JSON schema for backup plugin parameters.
+    # @PRE: Plugin instance exists.
+    # @POST: Returns dictionary schema.
+    # @RETURN: Dict[str, Any] - JSON schema.
     def get_schema(self) -> Dict[str, Any]:
         with belief_scope("get_schema"):
             config_manager = get_config_manager()
@@ -108,10 +108,10 @@ class BackupPlugin(PluginBase):
             },
             "required": ["env"],
         }
-    # #endregion get_schema
+    # [/DEF:get_schema:Function]
 
-    # #region execute [TYPE Function]
-    # @BRIEF Executes the dashboard backup logic with TaskContext support.
+    # [DEF:execute:Function]
+    # @PURPOSE: Executes the dashboard backup logic with TaskContext support.
     # @PARAM: params (Dict[str, Any]) - Backup parameters (env, backup_path, dashboard_ids).
     # @PARAM: context (Optional[TaskContext]) - Task context for logging with source attribution.
     # @PRE: Target environment must be configured. params must be a dictionary.
@@ -255,6 +255,6 @@ class BackupPlugin(PluginBase):
             except (RequestException, IOError, KeyError) as e:
                 log.error(f"Fatal error during backup for {env}: {e}")
                 raise e
-    # #endregion execute
+    # [/DEF:execute:Function]
 # #endregion BackupPlugin
 # #endregion BackupPlugin