- parseWorkbook returns a report per sheet (table counts, issues, ok) - sheets with E-level issues cannot be selected (spec section 2.3) - pier input carries its source sheet name Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
- parse Excel input by header strings (pier, IP, bearing tables) - DMS azimuth parser (E03), input validation (E01, E02) - pure geometry: axis, bearings, stepped coping, column, footing, piles, blinding - warnings W01, W02, W05, W07, I01 - regression tests against spec.md section 12 (P1) Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>