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92727568a3
Separates the SAP-spec source of truth from the empirical cert-
calibration prices. cert_to_inputs() now accepts a `prices: PriceTable`
parameter defaulting to SAP_10_2_SPEC_PRICES (3.64 gas, 16.49 elec,
9.40 7h-low — verbatim from SAP 10.2 §12.2 / Table 12). Parity probe
passes the empirical cert_calibration_prices() factory from
domain.sap.tables.table_12_cert_calibration which carries the lower
prices that match the cert assessor software's actual output (3.48,
13.19, 5.50).
This split is documented in both table modules: cert calibration is
explicitly NOT spec-correct, it just matches observed cert behaviour
for parity testing.
100-cert parity probe with cert-calibration prices:
MAE 6.66 → 4.99 (recovered from spec-price regression; also -0.41
from absolute baseline thanks to other S-B fixes)
RMSE 10.29 → 7.13
bias -4.66 → -1.03
within ±1: 20% → 23%
within ±3: 38% → 47%
within ±5: 63% → 67%
within ±10: 82% → 93%
Session-B progress overall (S-B2 baseline → here): MAE 8.41 → 4.99,
within ±1 doubled (10% → 23%).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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