cian_city_sweep was dormant (107, enabled=false) on a stale 'proxy dead'
assumption from 2026-05-31. Verified 2026-06-16: all 3 mobile-proxy egresses
alive; CianScraper + cian_detail self-warm their curl_cffi sessions (no DB
cookies). Prod smoke proved the full sweep works cookieless:
run 99 (SERP): 560 fetched / 89 inserted / 471 updated, 0 errors
run 100 (detail): detail_enriched=3/3, houses_enriched=4, 0 failures
Only cian_history_backfill (source-provided priceChanges) needs the stale
cookies — tracked separately for human re-upload.
Restores novostroyki + vtorichka cian coverage (was a frozen late-May
snapshot: ~28 of 15067 active re-seen within 14d). Nightly 02-05 UTC.
Refs #759