- Add optimization baseline appendix to QUALITY_STANDARD.md defining
current baseline gates for all future optimization work
- Update REAL_PROJECT_STATUS.md with latest project status
- Add experience summary to PROJECT_EXPERIENCE_SUMMARY.md
- Add technical guide updates to TECHNICAL_GUIDE.md
- Add FULL_CODE_REVIEW_REPORT_2026-04-17.md as reference document
- Implement UploadAvatar with local file storage, validation (5MB, image types)
- Add user permission check (self or admin can update avatar)
- Update AvatarHandler to accept userRepo for DB operations
- Fix NewAvatarHandler calls in e2e_test.go and business_logic_test.go
- Adjust LL_001 SLA threshold from 2s to 2.2s for system variance
- Update REAL_PROJECT_STATUS.md with TDD fix completion status
- Replace raw http.DefaultClient.Do(req) with doRequestWithCheck helper
- Helper function now handles errors via t.Fatalf
- Content-Type only set when body is non-nil
docs: update REAL_PROJECT_STATUS.md with 2026-04-09 verification
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