The Y intersection had a real I3 violation that the M0.3 centroid-
only check missed (parcels 0 and 7 overlapped by ~64.5 m²). This
commit:
- adds geo 0.28 as a dependency
- replaces y_intersection_no_overlaps's centroid-in-polygon check
with a rigorous polygon-polygon intersection test using
geo::BooleanOps; adds rectangle_no_overlaps_rigorous as a
positive-control test for the rectangle case
- adds cleanup_block_parcel_overlaps pass at the end of
subdivide_block: iterate parcels in placement order (corners
first, regulars after), subtract previously-claimed territory
from each via geo's polygon difference, drop empties, recover
frontage edge index and edge_kinds for survivors
- snaps polygon coords to a 1mm grid before handing to geo (helps
geo's sweep-line invariants); strips collinear-triple and
near-zero-length-edge artifacts from boolean output before
feeding back into Polygon::new strict
- wraps difference/union calls in catch_unwind so geo's
occasional sweep-line panic on degenerate inputs falls back to
a no-op instead of crashing subdivision
Test status: 24 unit + 24 integration + 1 doc passing. Y figure
visually cleaner — every parcel sits inside its own sub-block, no
visible overlap between sub-blocks.
Self-decisions checklist progress: rigorous I3 testing landed
(checklist item ✓).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
