CRITICAL REGRESSION: PDF output plots wrong scale (was working 2 weeks ago) #985
Description
REGRESSION ANALYSIS REQUIRED
Problem: PDF output shows incorrect plot scale/sizing compared to working state from 2 weeks ago.
Regression Evidence: User confirms this functionality was working 2 weeks ago and has broken recently.
Required Actions:
- Git history investigation: check commits from ~2 weeks ago (around 2025-08-17)
- Git bisect to identify the breaking commit
- Compare current PDF output with historical working output
- Restore correct PDF plot scaling
Technical Investigation:
- Check PDF backend implementation changes
- Verify plot coordinate scaling calculations
- Test PDF generation with known working commit
- Document breaking change and fix
Priority: TOP - Sprint #1 emergency issue
Type: Regression defect requiring git history analysis