Group E1 of the scraper_kit migration epic (#2277 -> #2308 -> #2334): prepares the
kit side of app/services/scrapers/avito_imv.py -> scraper_kit.providers.avito.imv
WITHOUT switching any real call site (estimator.py is #2337, a separate final step;
house_imv_backfill.py is deliberately deferred too, see report).
- Golden-parity: full evaluate_via_imv() async flow (geocode A/B + evaluate C) proven
byte-identical between legacy and kit on REAL live-captured Avito API responses
(tests/fixtures/avito_imv_geo_position.json + avito_imv_getdata.json), routed through
the browser_fetcher transport to stay offline/deterministic. Previously this function
had zero parity coverage (only _parse_price was covered, via admin.py Group A).
Added cheap pure-function parity for compute_imv_cache_key/_parse_geo_position/
_parse_placement_history/_parse_suggestions too.
- Config-footgun regression: kit evaluate_via_imv only reads config.scraper_proxy_url
when config= is explicitly passed; called bare it silently builds a proxy-less
curl_cffi session even with a real proxy configured. Two tests lock this down
(without config= -> proxies=None, with config=RealScraperConfig() -> proxies wired) —
manually verified by breaking scraper_kit/providers/avito/imv.py's config threading,
watching the "with config" test fail on the exact proxies assertion, then reverting.
No production import switched in this commit — see PR/issue report for the full
caller audit and the house_imv_backfill.py deferral rationale.
