Three slices closed:
- S0380.150 18-hour tariff for pumps+lighting (§12 + App F2)
- S0380.151 RdSAP 10 §4.1 Table 5 extract-fans default
- S0380.152 Table 3 primary loss for solid-fuel back-boilers
Cluster A closed; Cluster B partial (SF3 done, SF2 partial); Cluster
C open. Σ|ΔSAP| 14.5 → 6.4 across the 25 cascade-OK cohort variants.
Mid-session pivot documented: my Cluster B hypothesis was wrong
(Table 9c step 12), the actual gap was Table 3 primary loss for
solid-fuel boilers. Discipline added: dump per-line worksheet data
before forming a spec hypothesis.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
