The expected_sold_range_low/high were derived from the analog asking-IQR
(× asking→sold ratio): only ~55% of actual sold prices fell inside the stated
range — a 50%-ish interval mislabeled as the estimate's range. Replace with a
calibrated band around the expected_sold POINT, gated behind
estimate_calibrated_pi_enabled (default ON):
range_low = expected_sold_price × 0.649 (empirical p10 of sold/expected_sold)
range_high = expected_sold_price × 1.392 (empirical p90, n=2366 prod deals)
This is a genuine ~80% prediction interval (verified 80.0% coverage on the
2366-deal sample). Headline asking range_low/high (market-asking IQR) untouched.
Frozen backtest baseline regenerated: range_coverage.overall 55.23 → 80.14
(n_covered 153 → 222); expected_sold POINT mape/bias and headline unchanged
(only the band moved). Tests asserting the old asking-IQR × ratio band updated
to the calibrated band (documented behavior change).
Replace absolute min/max with robust percentiles so a single outlier ДКП
deal cannot shift the soft-bound corridor boundaries. Small samples fall
back gracefully via linear interpolation (n=3: P10≈index 0.2, P90≈index 2.8).
