feat(tradein): cian_detail.py — detail page scraper (88 fields + BTI + priceChanges, Wave 4 Worker B)
- fetch_detail(): curl_cffi AsyncSession → HTML → extract_state(mfe='frontend-offer-card', key='defaultState')
- DetailEnrichment dataclass: cian_id, windows_view_type, wcs counts, ceiling_height, repair_type, views_total/today, bti_data, price_changes, agent_profile, newbuilding_data, raw_offer/sister_states
- extract_all_states() sister container stash: bti (houseData), newObject, plus raw dump for future extraction
- save_detail_enrichment(): UPDATE listings (all 019 cols present), INSERT offer_price_history (ON CONFLICT DO NOTHING), UPSERT agents + link agent_id_fk, psycopg v3 CAST(:x AS type) everywhere
- Tests: 19 tests (unit helpers + async mocked fetch_detail: no-state, 403, core fields, BTI sister state, newbuilding link)
- Ruff clean, asyncio_mode=auto
f6ece38619