docs(028): update all feature documents for enhancement phase completion (US11-US12)
- effort-estimate-report.md: updated metrics (~182 files, ~40K LOC), added enhancement breakdown, updated comparative analysis
- spec.md: status → Core + Enhancement complete, added Enhancement Implementation Notes
- plan.md: all enhancement components marked ✅, metrics updated
- tasks.md: all 26 enhancement tasks (T135-T160) → [x], closure summary updated
- quickstart.md: added §10 Direct Database Insert flow
- data-model.md, research.md, contracts/modules.md, ux_reference.md, spec.ru.md, checklists/requirements.md: dates, statuses, metrics aligned
- all documents now reflect 2026-06-11 state: ~174-182 files, ~39-40K LOC, ~580 pytest, ~68 vitest
busya
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