- repair-note: reworded to signal heuristic adjustment (coverage ~2%, not data-derived)
- ratio_basis: set 'expected_over_median' when honest_ratio overwrites the raw per-rooms ratio (#2141 descriptor)
- _band_haircut: doc EKB-secondary calibration constants applied engine-wide (no behavior change)
- premium_buildings_curated: doc EKB-scope; oblast-elite still caught by _manual_review value thresholds
LOW audit R2 (#1-4). Regression gate byte-green.
