Session 9 ran five independent data-driven audits (profiler, dropped-field scan,
CO2/PE reconciliation, cross-provider LIG parity, HW-demand reconciliation) — all
converged on diffuse remaining gap — and shipped glazing Table-24 (+16 certs) +
HW-only heat-network DLF, taking 54.90% -> 56.8% within-0.5. The data-driven seam
is exhausted; session 10 switches to worksheet-level ground truth via the
summary-report-based per-cert audit. New agent prompt at HANDOVER_SUMMARY_AUDIT.md
with method, starter candidate certs, ruled-out list, and conventions.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Record the 4-agent audit, the shipped Tier-1 fuel-code strict-raise (7878a969),
and the un-actioned Tier 2/3 candidates (glazing codes 4-12, window orientation,
age-band swallows) for a future robustness slice.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Profile-driven re-sweep at HEAD da094feb. Every biased/error-carrying bucket
chased field-by-field resolved to proxy / already-deproven / already-fixed:
roof code 5/8 (same u_roof as code 4), per-bp age mapping (correct),
'(same dwelling above)' roofs (5 certs, 4 fine), index-less MEV gas
(centred by e6dda705 to signed +0.09), wit=4 cavity -0.25 (tail-driven),
community whc=903 HW (= deproven meter_type=3). The +32 outlier 2958 is
per-cert (twin 3420 is +0.18). Residual is a broad per-cert fabric+HW tail.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Records the fuel-type-boundary canonicalisation, the goldens-caught
constraint (code 33 is also the electricity-10h tariff code), and the
deferred dual-fuel/community/fabric follow-ups.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds the flat-roof slice (52.1 → 53.1%) and records the unifying principle
("unknown insulation → as-built age default, not uninsulated") plus the
cross-element review confirming all element types now conform.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds the cavity wall-U slice to the SESSION-5 block + headline table;
records the by-age-band re-split method that surfaced the G/H spike.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
47.6% → 48.6% within 0.5; immersion code mapping corrected (1=dual,
2=single); next robust leads are under-rating flat/party-fabric scatter.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Updates the headline (45.1 → 47.6%), records the four shipped fixes + the
roof-8 false-lead closure, documents the two methods that worked
(description-vs-code audit + outlier-robust categorical sweep by net skew +
median), and lists the open robust leads (whc=903 immersion HW, cat-7 storage,
dual immersion) with the scatter buckets to avoid.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Records the session-4 audit: walls/heating/controls clean; roof_construction=8
("Pitched, insulated", no measured thickness) computing U=2.30 is CORRECT, not a
bug — confirmed by user worksheet sim-case-29 (band C → Elmhurst SAP 55 ≡ our
56.75; lodged 80 is data-fidelity artifact). Lesson: "insulated (assumed)" = the
age-band default insulation level, not "well insulated". DO NOT re-chase roof-8.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Code 3 = "(other premises below)" = above partially heated space (§3.12 →
U=0.7), confirmed 9/9 on single-BP certs (the diagnostic that dodged the
lossy-floors[] contamination). Records the 7536 re-pin and the lesson that
"irreducible residual" golden notes can mask a real mapper bug.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Record that profiler lead #1 (floor_codes=3) is not a clean single cause
(bimodal + confounded), that the paired worksheet certs confirm only
codes 1/6/7 (code 3 unmapped → needs a worksheet for 0380-2087), and that
immersion_type=2 / main_control=2107 / roof_codes=1 are scatter, not
dispatch bugs. The exposed-floor-on-flats fix (§3.12) shipped at b40e0f67.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
