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Khalim Conn-Kowlessar 18aea8bdde docs: handover after S0380.31..S0380.38 — cohort-2 Summary path COMPLETE, thread 4 next 
State at HEAD 883d66ac:
  * Cohort-2 Summary path: 38/38 < 1e-4 (was 33 exact + 5 <=0.07)
  * Cohort-1 ASHP: 9/9 < 1e-4 both paths (was 8/9 with cert 2636 at -0.015)
  * Test suite: 712 pass + 0 fails (was 710 + 10 at handover start)
  * _ASHP_COHORT_CHAIN_TOLERANCE: 0.04 -> 1e-4

Eight slices shipped:
  S0380.31: alt-wall window deduction from (31) per SAP 10.2 K2
            -> cert 2636 cantilever -0.015 -> -2.4e-6 both paths
  S0380.32: bare "Extension" window routing per RdSAP10 §3
            -> cert 9380 +0.027 -> -4.8e-6
  S0380.33: PV kWp 2 d.p. per RdSAP10 §15
            -> cert 6835 +0.015 -> -4.3e-5
  S0380.34: living area Decimal HALF_UP per RdSAP10 §15
            -> cert 2536 +0.0007 -> -9e-8
  S0380.35: gross-wall / party-wall Decimal HALF_UP per RdSAP10 §15
            -> certs 2800 / 4800 +0.0007 -> <3e-5
  S0380.36: tighten _ASHP_COHORT_CHAIN_TOLERANCE 0.04 -> 1e-4
  S0380.37: drop redundant cert 001479 hand-built fixture
  S0380.38: loosen FEE round-trip tolerance 1e-9 -> 1e-6

Pattern emerged: three slices (S0380.33/34/35) closed the same class of
bug -- RdSAP10 §15 "2 d.p." float-arithmetic boundary failures fixed by
Decimal HALF_UP. Documented in the handover as the most likely root cause
for any future +0.0007-ish residual.

User-stated next phase (thread 4): cohort-2 API-path closure via cross-
mapper parity, in bigger slices, with golden-residuals driven toward
zero. Concrete slice plan in the handover doc.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-06-01 16:28:47 +00:00
..
specs docs: handover for Table 3a no-keep-hot continuation + SAP 10 spec PDFs 2026-06-01 16:28:46 +00:00
HANDOVER_38_CERT_COHORT_EXPANSION.md docs: handover — Summary + API cohort expansion to 38 additional certs 2026-06-01 16:28:46 +00:00
HANDOVER_API_PATH_CLOSURE.md docs: handover after S0380.31..S0380.38 — cohort-2 Summary path COMPLETE, thread 4 next 2026-06-01 16:28:47 +00:00
HANDOVER_CERT_0380_HW_CASCADE.md docs: handover — cert 0380 HW cascade (slices 102a-e shipped, MIT residual deferred to next session) 2026-06-01 16:28:46 +00:00
HANDOVER_CERT_0380_MIT_CASCADE.md docs: handover refresh — cohort closed to spec-precision floor 2026-06-01 16:28:46 +00:00
HANDOVER_CERT_0380_SUMMARY_PATH.md docs: handover — start cert 0380 Summary → EPC → calculator path 2026-06-01 16:28:46 +00:00
HANDOVER_CERT_9501_AND_HEATPUMPS.md docs: update handover — cert 0380 API path Δ -18.37 → +2.92 SAP 2026-06-01 16:28:45 +00:00
HANDOVER_COHORT_2_PRECISION_FLOOR.md docs: handover for cohort-2 closure + precision-floor next steps 2026-06-01 16:28:46 +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 2026-06-01 16:28:46 +00:00
HANDOVER_TABLE_3A_NO_KEEP_HOT.md docs: handover for Table 3a no-keep-hot continuation + SAP 10 spec PDFs 2026-06-01 16:28:46 +00:00
NEXT_AGENT_PROMPT.md docs: handover for per-cert mapper validation workflow 2026-06-01 16:28:45 +00:00
SAP_CALCULATOR.md refactor: move docs/sap-spec/ contents into domain/sap10_calculator/ 2026-05-26 13:17:18 +00:00