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c4b2782931
Per [[project-golden-coverage-state]] memory + docs/HANDOVER_GOLDEN_COVERAGE.md:
cohort-2 (38 certs) was chain-tested at 1e-4 SAP via
`test_summary_pdf_mapper_chain.py::test_api_cohort_2_full_chain_sap_
matches_worksheet_at_1e_minus_4` but NOT in golden — PE/CO2 cascade
output for 38 worksheet-backed certs had zero regression guards.
Largest invisible drift: cert 2102-3018-0205-7886-5204 at PE +20.36
kWh/m² / CO2 −0.79 t/yr. Was the +20.4 PE outlier called out in the
handover doc. Now pinned and visible to any future cascade refactor.
Cohort-2 SAP residuals all close to 0 at integer (1e-4 continuous-SAP
convergence rounds to exact match). PE / CO2 baseline residuals
captured at HEAD:
- PE residual range: −4.18 to +20.36 kWh/m². Median ≈ −0.1.
- CO2 residual range: −0.79 to +0.05 t/yr. Median ≈ −0.02.
- 14 certs cluster at PE ≈ −2.7 to −4.2 kWh/m² (gas combi PCDB
+ boiler PE under-count pattern, shared with cohort-1
cert 2130 and ASHP cohort certs).
Pinned per the existing `_GoldenExpectation` shape — SAP at abs=0
(integer), PE at abs=0.01 kWh/m², CO2 at abs=0.001 t/yr. Notes kept
short for each cohort-2 cert because the pinned residual itself is
the signal; per-cert slice history lives in the chain test's
`_COHORT_2_API_CLOSED` list and `sap worksheets/Additional data with
api/<cert>/dr87-*.pdf` worksheets.
Test suite: 317 pass (was 279) + 9 expected 000565 cascade-gap fails
(unchanged). Pyright: 1 error baseline preserved on the
`pytest.approx` import line (per [[feedback-prefer-abs-diff-over-
pytest-approx]] this is the legacy `test_api_to_domain_mapper_
preserves_main_heating_index_number` line that pre-dates the AAA
convention; not touched by this slice).
Next-investigation target: cert 2102 PE +20.36 / CO2 −0.79 closure.
Likely sits in the secondary-heating House coal PE/CO2 cascade
(S0380.43 closed SAP via spec-fuel routing but didn't address the
PE/CO2 paths). Visible as a fired golden test on any cascade refactor
of that surface.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| postcode.py | ||