Khalim Conn-Kowlessar 3363f63f5e docs: handover for systematic section-by-section RdSAP 10 review ... The slice-by-slice "fix the biggest residual" approach has hit a ceiling at SAP MAE ~4.6 because the cert-calibration prices absorb multiple structural deviations from spec. Any spec-correct fix in one component breaks the calibration for others. Three failed slices this session (standing charges, cat=10 routing, combi zero-loss) made the pattern unambiguous. Pivot: systematic section-by-section spec verification. Read the RdSAP 10 + SAP 10.2 spec in order, check each table / formula / footnote against the corresponding code, fix gaps one at a time. Build the spec-correct engine first; re-derive cert-cal calibration once at the end as a thin Elmhurst-compatibility layer. Handover doc covers: - Critical framing (deterministic, not assessor judgement) - Current state (SAP MAE 4.61, PE MAE 43.32 at f4a8d2a0) - Why the slice-by-slice approach won't converge - Scope decisions (RdSAP 10 + SAP 10.2 only; park full-SAP + PCDB) - Section-to-code mapping - Known dead-ends to skip - Cert-calibration vs spec-correctness tension and how to resolve it - The 7 golden fixtures and their compensating-error caveats - Trace mode recommendation (ADR-0009's `intermediate` field) - Specific §1-3 starting tasks - Workflow recap Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>		2026-05-19 07:30:27 +00:00
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adr	ADR-0009: pivot to deterministic SAP 10.3 calculator (Accepted)	2026-05-17 21:27:21 +00:00
sap-spec	docs: handover for systematic section-by-section RdSAP 10 review	2026-05-19 07:30:27 +00:00