Captures the per-cert validation state at HEAD b7fbbcca:
- 5 slices shipped this session: cost cascade β-split (.47), schema
gap closure for real-API battery_capacity (.48), Table 12e
effective-monthly PE factor for PV (.49), §4 seasonal HW for PV β
cascade (.50), UnmappedApiCode strict-raise pattern on API mapper
(.51).
- 769 pass + 0 fail across the full baseline; pyright net-zero on
every touched file.
Crucial finding for the next agent: cohort-2 (38 certs) is chain-
tested at 1e-4 SAP vs worksheet but NOT in test_golden_fixtures.py
— PE/CO2 cascades have NO regression guard. Probed at HEAD:
14/38 cohort-2 certs have non-trivial PE residuals invisible to any
current test, including cert 2102 at +20.4 PE / -0.79 CO2 (single
worst undetected residual in the cohort).
Agreed next slice: add all 38 cohort-2 certs to
test_golden_fixtures.py with current PE/CO2 pinned. Surfaces cert
2102 as the next closure target (worksheet exists under
`sap worksheets/`) and creates PE/CO2 regression guards across the
worksheet-backed cohort.
Open threads ranked by tractability:
- Cert 2102 +20.4 PE — worksheet exists, well-scoped
- PV (233a)+(233b) monthly mystery — documented memory entry; ~0.5
kWh/m² across ASHP cohort
- _api_glazing_transmission strict-raise extension — mechanical
- 8 open-front golden certs (oil + RR) at high residuals — blocked
on worksheets
Fuel-type diversity guidance: heating system breakdown across all
60+ fixtures shows 34 gas, 20 ASHP, 2 oil (both open-front no
worksheets), 0 solid fuel, 0 LPG, 0 electric direct. Closure on
oil + solid fuel + LPG + electric blocked on worksheet availability
— the gov.uk EPB downloads UI returns API JSON only; dr87 worksheets
come from the assessor's tool (typically Elmhurst SAP) export ZIP.
Handover doc at docs/HANDOVER_GOLDEN_COVERAGE.md.
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