Model/domain/sap10_calculator/docs
Khalim Conn-Kowlessar 29c4b029e3 docs: handover after S0380.39..S0380.43 — cohort-2 API path 38/38 closed
Session shipped 5 slices that closed the entire cohort-2 API-path
cluster (S0380.39 bulk-fetch, S0380.40 parametrized test, S0380.41
RdSAP 21 → SAP 10.2 glazing alias, S0380.42 Decimal HALF_UP per-window
areas, S0380.43 SAP 631 → spec fuel).

Documents:
  - Cross-mapper parity at cascade established for all 38 cohort-2
    certs (and 9 cohort-1 ASHP); both paths < 1e-4 vs worksheet.
  - Tolerance tightening deferred — 1e-4 is the realistic floor at
    HEAD (worst residual 4.91e-5 on cert 2102).
  - Lessons learned: GOV.UK RdSAP 21 enum != cascade enum (codes
    needing remap are incremental as fixtures surface them);
    Decimal HALF_UP per-window areas extends the S0380.34/35
    pattern; SAP heating-type → spec fuel dispatch is the new
    forcing-function pattern for cert-lodgement inconsistencies.
  - Open front: golden-residuals → ~0 on PE/CO2. ASHP cluster
    (-7..-15 kWh/m² PE / +0.16..+0.28 t/yr CO2 across 7 certs with
    the same PCDB heat pump) is the highest-value single thread —
    likely SAP 10.2 Appendix L1 / Table 12 PE-factor or CO2-factor
    cascade gap. Three concrete diagnostic probes proposed.

Test baseline at HEAD: 750 pass + 0 fail.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-28 17:22:55 +00:00
..
specs docs: handover for Table 3a no-keep-hot continuation + SAP 10 spec PDFs 2026-05-28 08:29:12 +00:00
HANDOVER_38_CERT_COHORT_EXPANSION.md docs: handover — Summary + API cohort expansion to 38 additional certs 2026-05-27 22:22:13 +00:00
HANDOVER_API_PATH_CLOSURE.md docs: handover after S0380.31..S0380.38 — cohort-2 Summary path COMPLETE, thread 4 next 2026-05-28 16:34:36 +00:00
HANDOVER_CERT_0380_HW_CASCADE.md docs: handover — cert 0380 HW cascade (slices 102a-e shipped, MIT residual deferred to next session) 2026-05-27 12:42:44 +00:00
HANDOVER_CERT_0380_MIT_CASCADE.md docs: handover refresh — cohort closed to spec-precision floor 2026-05-27 17:03:09 +00:00
HANDOVER_CERT_0380_SUMMARY_PATH.md docs: handover — start cert 0380 Summary → EPC → calculator path 2026-05-27 17:23:10 +00:00
HANDOVER_CERT_9501_AND_HEATPUMPS.md docs: update handover — cert 0380 API path Δ -18.37 → +2.92 SAP 2026-05-26 22:46:30 +00:00
HANDOVER_COHORT_2_PRECISION_FLOOR.md docs: handover for cohort-2 closure + precision-floor next steps 2026-05-28 10:33:17 +00:00
HANDOVER_GOLDEN_RESIDUALS.md docs: handover after S0380.39..S0380.43 — cohort-2 API path 38/38 closed 2026-05-28 17:22:55 +00:00
HANDOVER_NEXT.md refactor: move docs/sap-spec/ contents into domain/sap10_calculator/ 2026-05-26 13:17:18 +00:00
HANDOVER_PRECISION_FLOOR_CLOSED.md docs: handover after S0380.26-30 precision-floor closure 2026-05-28 12:55:45 +00:00
HANDOVER_TABLE_3A_NO_KEEP_HOT.md docs: handover for Table 3a no-keep-hot continuation + SAP 10 spec PDFs 2026-05-28 08:29:12 +00:00
NEXT_AGENT_PROMPT.md docs: handover for per-cert mapper validation workflow 2026-05-26 17:36:56 +00:00
SAP_CALCULATOR.md refactor: move docs/sap-spec/ contents into domain/sap10_calculator/ 2026-05-26 13:17:18 +00:00