Finding 2 became a real code fix: interstitial_fill_into now enforces
the footprint-wins conflict rule (column_has_voxel range probe) — the
FilledChunk absence contract was previously a documented promise the
code didn't keep against conflicting inputs; pinned by a fully-
overlapping-leaf test asserting per-tile resolution. The tautological
overlap test replaced with a real rects_overlap() geometric helper
(itself sanity-tested) applied pairwise. The degenerate-setback fix is
now a standalone pure fn shrink_lot_or_interstitial with four boundary
tests — honestly documented as unreachable from live traffic today
(every min_lot exceeds every setback), a robustness guard for future
recalibration. Both sub-chunk clip tests now reconstruct the full
32-tile union across the seam (disjoint + complete), including the
pre-existing footprint clip test (leave-cleaner). Brief's ChunkLayout
claim tightened to the verified no-production-consumer statement.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jpmschweitzerandClaude Fable 5
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