feat: trading feedback engine — periodic performance reports with AI summarization

- Migration 038: trading_reports table + report-summarizer agent seed
- 6 reporting modules: models, collector, sections, validator, summarizer, generator
- API endpoints: GET /api/reports (paginated, filterable), GET /api/reports/{id}
- Frontend hooks: useReports, useReport with TanStack Query
- Scheduler: daily (after 16:30 ET) and weekly (Saturday) report triggers
- Redis queue consumer for async report generation with retry/dedup
- 5 property-based tests (chunking, serialization, validation, accuracy, deltas)
- 109 unit/integration tests across all modules
- 6 frontend hook tests with MSW mocks

frontend/src/test/mocks/handlers.ts

@@ -334,6 +334,17 @@ export const handlers = [
     return HttpResponse.json({ enabled: body.enabled, previous_enabled: true, toggled_by: 'operator' });
   }),
 
+  // Trading Reports
+  http.get('/api/reports', () => HttpResponse.json([
+    { id: 'rpt-1', report_type: 'daily', period_start: '2025-01-15', period_end: '2025-01-15', validation_status: 'passed', generated_at: '2025-01-15T21:30:00Z' },
+  ])),
+  http.get('/api/reports/:id', ({ params }) => {
+    if (params.id === 'rpt-1') {
+      return HttpResponse.json({ id: 'rpt-1', report_type: 'daily', period_start: '2025-01-15', period_end: '2025-01-15', report_data: { pnl: { realized_pnl: 125.5 }, executive_summary: 'Test' }, validation_status: 'passed', generated_at: '2025-01-15T21:30:00Z', created_at: '2025-01-15T21:30:05Z' });
+    }
+    return new HttpResponse(null, { status: 404 });
+  }),
+
   // Validation: Model Quality & Calibration endpoints
   http.get('/api/validation/summary', () => HttpResponse.json(mockValidationSummary)),
   http.get('/api/validation/calibration', () => HttpResponse.json(mockValidationCalibration)),