Khalim Conn-Kowlessar 411c477d09 P5.14: SAP 10.2 worksheet trace + RdSAP10 deflator drift note ... Closes the second half of P5 (HANDOVER_SYSTEMATIC_REVIEW §2.5): - Adds test_bre_worked_examples.py — one comprehensive test that locks every published SapResult.intermediate key against its SAP 10.2 worksheet item number ((4) TFA, (33) fabric heat loss, (39) HTC, (40) HLP, (73) gains, (93) mean internal temp, (98c) space heating, (240e/247/250) costs, (252) PV credit, (256) deflator, (257) ECF, (261-272) per-end-use CO2, (275-287) primary energy per m²). All formulas derived independently from the worksheet pages 131-148; passes against the synthetic 100 m² baseline. - Explicit caveat in module docstring: BRE-published worked examples don't exist in any of the three SAP-spec PDFs we have (rdSAP10, SAP10.2, SAP10.3 — all greppped). The test is spec-formula-derived, not BRE-validated. Structure stays if BRE numbers surface later; only expected values change. Also surfaces and documents an RdSAP10 spec drift in PARITY_FINDINGS.md: Table 32 (page 95 of rdSAP10) gives Energy Cost Deflator = 0.42, vs the code's 0.36 (SAP10.2 Table 12, worksheet item (256)). Not changed in P5 — needs ADR-level resolution on whether the calculator targets SAP10.2 (0.36) or RdSAP10 (0.42) ratings. P5 (SapResult.intermediate population + BRE worked-example fixtures) is now complete on this branch.		2026-05-19 15:32:42 +00:00
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adr	docs: ADR-0010 retargets calculator to SAP 10.2; rewrite handover	2026-05-19 09:54:24 +00:00
sap-spec	P5.14: SAP 10.2 worksheet trace + RdSAP10 deflator drift note	2026-05-19 15:32:42 +00:00