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/models/assistant.py

@@ -1,8 +1,8 @@
 # #region AssistantModels [C:3] [TYPE Module] [SEMANTICS assistant, audit, confirmation, chat]
 # @BRIEF SQLAlchemy models for assistant audit trail and confirmation tokens.
-# @LAYER Domain
-# @INVARIANT Assistant records preserve immutable ids and creation timestamps.
-# @RELATION DEPENDS_ON -> [MappingModels]
+# @LAYER: Domain
+# @RELATION DEPENDS_ON -> MappingModels
+# @INVARIANT: Assistant records preserve immutable ids and creation timestamps.
 
 from datetime import datetime
 
@@ -13,9 +13,9 @@ from .mapping import Base
 
 # #region AssistantAuditRecord [C:3] [TYPE Class]
 # @BRIEF Store audit decisions and outcomes produced by assistant command handling.
-# @PRE user_id must identify the actor for every record.
-# @POST Audit payload remains available for compliance and debugging.
-# @RELATION INHERITS -> [MappingModels]
+# @RELATION INHERITS -> MappingModels
+# @PRE: user_id must identify the actor for every record.
+# @POST: Audit payload remains available for compliance and debugging.
 class AssistantAuditRecord(Base):
     __tablename__ = "assistant_audit"
 
@@ -34,9 +34,9 @@ class AssistantAuditRecord(Base):
 
 # #region AssistantMessageRecord [C:3] [TYPE Class]
 # @BRIEF Persist chat history entries for assistant conversations.
-# @PRE user_id, conversation_id, role and text must be present.
-# @POST Message row can be queried in chronological order.
-# @RELATION INHERITS -> [MappingModels]
+# @RELATION INHERITS -> MappingModels
+# @PRE: user_id, conversation_id, role and text must be present.
+# @POST: Message row can be queried in chronological order.
 class AssistantMessageRecord(Base):
     __tablename__ = "assistant_messages"
 
@@ -57,9 +57,9 @@ class AssistantMessageRecord(Base):
 
 # #region AssistantConfirmationRecord [C:3] [TYPE Class]
 # @BRIEF Persist risky operation confirmation tokens with lifecycle state.
-# @PRE intent/dispatch and expiry timestamp must be provided.
-# @POST State transitions can be tracked and audited.
-# @RELATION INHERITS -> [MappingModels]
+# @RELATION INHERITS -> MappingModels
+# @PRE: intent/dispatch and expiry timestamp must be provided.
+# @POST: State transitions can be tracked and audited.
 class AssistantConfirmationRecord(Base):
     __tablename__ = "assistant_confirmations"