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/services/reports/normalizer.py

@@ -1,16 +1,15 @@
 # #region normalizer [C:5] [TYPE Module] [SEMANTICS reports, normalization, tasks, fallback]
 # @BRIEF Convert task manager task objects into canonical unified TaskReport entities with deterministic fallback behavior.
-# @LAYER Domain
-# @PRE session is active and valid
-# @POST Returns Normalizer output with normalized fields
-# @SIDE_EFFECT Read-only database operations
-# @DATA_CONTRACT ReportRow -> NormalizerInput; session_id -> valid UUID
-# @INVARIANT Normalizer instance maintains consistent field order
+# @LAYER: Domain
 # @RELATION DEPENDS_ON -> [backend.src.core.task_manager.models.Task:Function]
 # @RELATION DEPENDS_ON -> [backend.src.models.report:Function]
 # @RELATION DEPENDS_ON -> [backend.src.services.reports.type_profiles:Function]
+# @INVARIANT: Normalizer instance maintains consistent field order
+# @DATA_CONTRACT: ReportRow -> NormalizerInput; session_id -> valid UUID
+# @PRE: session is active and valid
+# @POST: Returns Normalizer output with normalized fields
+# @SIDE_EFFECT: Read-only database operations
 
-# [SECTION: IMPORTS]
 from datetime import datetime
 from typing import Any, Dict, Optional
 
@@ -18,15 +17,12 @@ from ...core.logger import belief_scope
 from ...core.task_manager.models import Task, TaskStatus
 from ...models.report import ErrorContext, ReportStatus, TaskReport
 from .type_profiles import get_type_profile, resolve_task_type
-# [/SECTION]
 
 
 # #region status_to_report_status [TYPE Function]
 # @BRIEF Normalize internal task status to canonical report status.
-# @PRE status may be known or unknown string/enum value.
-# @POST Always returns one of canonical ReportStatus values.
-# @PARAM: status (Any) - Internal task status value.
-# @RETURN: ReportStatus - Canonical report status.
+# @PRE: status may be known or unknown string/enum value.
+# @POST: Always returns one of canonical ReportStatus values.
 def status_to_report_status(status: Any) -> ReportStatus:
     with belief_scope("status_to_report_status"):
         raw = str(status.value if isinstance(status, TaskStatus) else status).upper()
@@ -42,11 +38,8 @@ def status_to_report_status(status: Any) -> ReportStatus:
 
 # #region build_summary [TYPE Function]
 # @BRIEF Build deterministic user-facing summary from task payload and status.
-# @PRE report_status is canonical; plugin_id may be unknown.
-# @POST Returns non-empty summary text.
-# @PARAM: task (Task) - Source task object.
-# @PARAM: report_status (ReportStatus) - Canonical status.
-# @RETURN: str - Normalized summary.
+# @PRE: report_status is canonical; plugin_id may be unknown.
+# @POST: Returns non-empty summary text.
 def build_summary(task: Task, report_status: ReportStatus) -> str:
     with belief_scope("build_summary"):
         result = task.result
@@ -67,11 +60,8 @@ def build_summary(task: Task, report_status: ReportStatus) -> str:
 
 # #region extract_error_context [TYPE Function]
 # @BRIEF Extract normalized error context and next actions for failed/partial reports.
-# @PRE task is a valid Task object.
-# @POST Returns ErrorContext for failed/partial when context exists; otherwise None.
-# @PARAM: task (Task) - Source task.
-# @PARAM: report_status (ReportStatus) - Canonical status.
-# @RETURN: Optional[ErrorContext] - Error context block.
+# @PRE: task is a valid Task object.
+# @POST: Returns ErrorContext for failed/partial when context exists; otherwise None.
 def extract_error_context(task: Task, report_status: ReportStatus) -> Optional[ErrorContext]:
     with belief_scope("extract_error_context"):
         if report_status not in {ReportStatus.FAILED, ReportStatus.PARTIAL}:
@@ -111,10 +101,8 @@ def extract_error_context(task: Task, report_status: ReportStatus) -> Optional[E
 
 # #region normalize_task_report [TYPE Function]
 # @BRIEF Convert one Task to canonical TaskReport envelope.
-# @PRE task has valid id and plugin_id fields.
-# @POST Returns TaskReport with required fields and deterministic fallback behavior.
-# @PARAM: task (Task) - Source task.
-# @RETURN: TaskReport - Canonical normalized report.
+# @PRE: task has valid id and plugin_id fields.
+# @POST: Returns TaskReport with required fields and deterministic fallback behavior.
 #
 # @TEST_CONTRACT: NormalizeTaskReport ->
 # {
@@ -170,4 +158,4 @@ def normalize_task_report(task: Task) -> TaskReport:
         )
 # #endregion normalize_task_report
 
-# #endregion normalizer
+# #endregion normalizer