Audits identity pass-through fields (dims, counts, thicknesses) raw cert vs
EpcPropertyData across all 1000 certs. All apparent mismatches are legitimate
mapper behavior the first-pass audit didn't model: window_wall_type=4 windows
correctly split to sap_roof_windows (not dropped); empty placeholder building
parts correctly discarded; 'measured' insulation-thickness sentinel resolved to
the wall_insulation_thickness_measured value. Remaining per-BP diffs were an
index-misalignment artifact (raw BP[i] vs epc BP[i] after empty BP0 dropped).
Conclusion: mapper is faithful; divergences are Playwright-entry or calc-side.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
