rosreestr_deals contains застройщик DDU contracts (177-200 К/м²) that skew
median for secondary-market valuation (~114 К/м²). Pass empty deals list to
AggregatedEstimate; keep _fetch_deals() helper intact for future
segmentation work.
Source: estimate a0a0b820-e8a8-4eee-aa73-0ab3b98ac233 (deals median +40% vs analogs).