Route the door/window floor-plan placement dimensions through the new
opening-guides service:
- edge-to-edge clearance to the nearest neighbour (or wall end) on each
side, now with overlap suppression (previously nearest-only, ad-hoc).
- Figma-style equal-spacing — a "=" badge per gap on the wall centreline
whenever the moving opening is part of a run of 3+ (near-)equally-spaced
openings.
Adds the `equal-spacing-badge` FloorplanGeometry primitive, its 2D renderer
(distinct pink accent), and overlay registration. Shown while placing/moving.
Sill height + vertical alignment are 3D-only (a top-down plan has no vertical
axis) and land in the next phase.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
