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

services/reporting/__init__.py

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