Khalim Conn-Kowlessar 57867832f6 docs(adr): Bill Derivation (ADR-0014) + calculator goes load-bearing (ADR-0013 amend) ... Pin the bills design from a /grill-with-docs session: - ADR-0014: whole-home annual bill from SAP10 Calculation's delivered kWh per end use, re-priced at real Fuel Rates (NOT the calculator's SAP-notional total_fuel_cost_gbp, which is RdSAP Table 32 standardised prices ~half real electricity). Fuel enum + FuelRates + FuelRatesRepository static snapshot; per-section + total flat columns; raise on unpriced fuel (house coal / heat network are the named gaps). - ADR-0013 amendment: the shadow stepping-stone is collapsed — the calculator is load-bearing now. effective=calculated for sap_version<10.2 (StubRebaseliner floor 10.0->10.2); >=10.2 keeps lodged + logs divergence; a strict-raise aborts the batch (load-bearing for bills regardless of version). - CONTEXT: EPC Energy Derivation -> Bill Derivation (no "service" suffix); Baseline Performance energy block = per-end-use kWh + per-section bill + total; Fuel Rates = committed static snapshot; Rebaselining trigger threshold 10.2. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>		2026-06-02 09:20:50 +00:00
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adr	docs(adr): Bill Derivation (ADR-0014) + calculator goes load-bearing (ADR-0013 amend)	2026-06-02 09:20:50 +00:00
migrations	refactor(property-baseline): units on co2 / PEUI columns (PR #1139 review)	2026-06-01 14:57:00 +00:00
HANDOVER_ARA_NEXT.md	docs: correct SAP calculator path in CONTEXT (domain/sap → domain/sap10_calculator)	2026-06-01 18:56:41 +00:00