Dane Sabo 95b69eddac Untrack build artifacts; add .gitignore; milestone 0.2 + 0.3 progress
Tracked files dropped from 11,756 to ~40 by adding .gitignore and
removing target/, *.aux/log/etc, and .DS_Store from the index.

Code changes since the initial commit:
- Milestone 0.2 (corner parcel rework, sticky back edges,
  preserve-on-deform pipeline, performance instrumentation, new
  Y-intersection and edit before/after figures, journal §11
  session 2 entry).
- Milestone 0.3 in progress: I3 overlap fix at acute corners
  (programmatic test caught a real I3 violation in the Y figure;
  fixed by bisector-clipping regular parcels adjacent to acute
  corners), minimum-change deformation (parcels on a road whose
  *line* didn't change are skipped — only parcels on a road whose
  direction changed are deformed).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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