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

frontend/src/lib/api/__tests__/reports_api.test.js

@@ -1,3 +1,7 @@
+// #region ReportsApiTest [C:3] [TYPE Module] [SEMANTICS test,reports,api]
+// @BRIEF Unit tests for reports API client functions: query string building, error normalization, and fetch wrappers.
+// @RELATION DEPENDS_ON -> [ReportsApi]
+
 // [DEF:ReportsApiTest:Module]
 // @COMPLEXITY: 3
 // @SEMANTICS: tests, reports, api-client, query-string, error-normalization
@@ -211,3 +215,4 @@ describe('getReportDetail', () => {
 // [/DEF:TestGetReportsAsync:Class]
 
 // [/DEF:ReportsApiTest:Module]
+// #endregion ReportsApiTest

frontend/src/lib/auth/__tests__/permissions.test.js

@@ -1,3 +1,7 @@
+// #region PermissionsTest [C:3] [TYPE Module] [SEMANTICS test,auth,permissions,rbac]
+// @BRIEF Verifies frontend RBAC permission parsing and access checks.
+// @RELATION DEPENDS_ON -> [Permissions]
+
 // [DEF:PermissionsTest:Module]
 // @COMPLEXITY: 3
 // @SEMANTICS: tests, auth, permissions, rbac
@@ -101,3 +105,4 @@ describe("auth.permissions", () => {
 });
 
 // [/DEF:PermissionsTest:Module]
+// #endregion PermissionsTest

frontend/src/lib/components/assistant/__tests__/assistant_chat.integration.test.js

@@ -47,14 +47,14 @@ describe('AssistantChatPanel integration contract', () => {
   it('contains semantic anchors and UX contract tags', () => {
     const source = fs.readFileSync(COMPONENT_PATH, 'utf-8');
 
-    expect(source).toContain('<!-- [DEF' + ':AssistantChatPanel:Component] -->');
+    expect(source).toContain('<!-- #region AssistantChatPanel');
     expect(source).toContain('@COMPLEXITY: 5');
     expect(source).toContain('@UX_STATE: LoadingHistory');
     expect(source).toContain('@UX_STATE: Sending');
     expect(source).toContain('@UX_STATE: Error');
     expect(source).toContain('@UX_FEEDBACK: Started operation surfaces task_id');
     expect(source).toContain('@UX_RECOVERY: User can retry command');
-    expect(source).toContain('<!-- [/DEF' + ':AssistantChatPanel:Component] -->');
+    expect(source).toContain('<!-- #endregion AssistantChatPanel -->');
   });
 
   it('keeps confirmation/task-tracking action hooks in place', () => {

frontend/src/lib/stores/__tests__/mocks/env_public.js

@@ -1,3 +1,5 @@
+// #region MockEnvPublic [C:1] [TYPE Module] [SEMANTICS mock,env]
+
 // [DEF:mock_env_public:Module]
 // @RELATION: DEPENDS_ON -> [$env/static/public]
 // @COMPLEXITY: 3
@@ -5,3 +7,4 @@
 // @LAYER: UI (Tests)
 export const PUBLIC_WS_URL = 'ws://localhost:8000';
 // [/DEF:mock_env_public:Module]
+// #endregion MockEnvPublic

frontend/src/lib/stores/__tests__/mocks/environment.js

@@ -1,3 +1,6 @@
+// #region EnvironmentMock [C:2] [TYPE Module] [SEMANTICS mock,environment]
+// @BRIEF Mock for $app/environment in vitest, supplying browser, dev, and building flags.
+
 // [DEF:EnvironmentMock:Module]
 // @COMPLEXITY: 2
 // @PURPOSE: Mock for $app/environment in tests
@@ -9,3 +12,4 @@ export const dev = true;
 export const building = false;
 
 // [/DEF:EnvironmentMock:Module]
+// #endregion EnvironmentMock

frontend/src/lib/stores/__tests__/mocks/navigation.js

@@ -1,3 +1,6 @@
+// #region NavigationMock [C:2] [TYPE Module] [SEMANTICS mock,navigation]
+// @BRIEF Mock for $app/navigation in vitest, supplying goto, push, replace, prefetch, and prefetchRoutes stubs.
+
 // [DEF:NavigationMock:Module]
 // @COMPLEXITY: 1
 // @SEMANTICS: mock, navigation, sveltekit-v1-legacy-surface
@@ -13,3 +16,4 @@ export const prefetch = () => Promise.resolve();
 export const prefetchRoutes = () => Promise.resolve();
 
 // [/DEF:NavigationMock:Module]
+// #endregion NavigationMock

frontend/src/lib/stores/__tests__/mocks/state.js

@@ -1,3 +1,6 @@
+// #region StateMock [C:2] [TYPE Module] [SEMANTICS mock,state]
+// @BRIEF Mock for $app/state page data in vitest route/component tests, supplying default params, route, URL, status, and data.
+
 // [DEF:state_mock:Module]
 // @COMPLEXITY: 2
 // @PURPOSE: Mock for AppState in vitest route/component tests.
@@ -13,4 +16,5 @@ export const page = {
   form: null,
 };
 
-// [/DEF:state_mock:Module]
+// [/DEF:state_mock:Module]
+// #endregion StateMock

frontend/src/lib/stores/__tests__/sidebar.test.js

@@ -1,3 +1,7 @@
+// #region SidebarTest [C:3] [TYPE Module] [SEMANTICS test,sidebar,store,mobile,navigation]
+// @BRIEF Unit tests for sidebar store validating expansion toggles, active item selection, and mobile open/close transitions.
+// @RELATION DEPENDS_ON -> [sidebar]
+
 // [DEF:SidebarTest:Module]
 // @COMPLEXITY: 3
 // @SEMANTICS: sidebar, store, tests, mobile, navigation
@@ -132,3 +136,4 @@ describe('SidebarStore', () => {
 });
 
 // [/DEF:SidebarTest:Module]
+// #endregion SidebarTest

frontend/src/lib/stores/__tests__/taskDrawer.test.js

@@ -1,3 +1,7 @@
+// #region TaskDrawerTests [C:3] [TYPE Module] [SEMANTICS test,store,task-drawer]
+// @BRIEF Unit tests for task drawer store validating open/close, preference-aware opening, resource task mapping, and status-driven cleanup.
+// @RELATION DEPENDS_ON -> [taskDrawer]
+
 import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { get } from 'svelte/store';
 import {
@@ -74,3 +78,4 @@ describe('taskDrawerStore', () => {
     expect(state.resourceTaskMap['dash-1']).toBeUndefined();
   });
 });
+// #endregion TaskDrawerTests

frontend/src/services/__tests__/gitService.test.js

@@ -1,3 +1,7 @@
+// #region GitServiceContractTests [C:3] [TYPE Module] [SEMANTICS test,git-service,api]
+// @BRIEF API client tests ensuring correct endpoints are called per contract for Git service operations.
+// @RELATION DEPENDS_ON -> [GitServiceClient]
+
 // [DEF:gitServiceContractTests:Module]
 // @COMPLEXITY: 3
 // @SEMANTICS: git-service, api-client, contract-tests
@@ -246,3 +250,4 @@ describe('gitService', () => {
     });
 });
 // [/DEF:gitServiceContractTests:Module]
+// #endregion GitServiceContractTests