refine free-layer overlaps across copper pours

[mohan-bee]

Motivation

• Expose shared layer-transition regions across copper pours during rectangle construction, while retaining the remaining free space.

Before

• The RV1106 repro has zero shared top/inner2 free regions across its inner1 copper pour.

After

• Split eligible rectangle overlaps before rectsToMeshNodes assigns node IDs. Preserve remainders and reject solid obstacles, incomplete pour coverage, and overlaps too small for the configured via diameter.
• The refreshed full-board snapshot shows 818 shared top/inner2 regions. The refinement has no custom ID generator. Rectdiff's 73 tests pass with one existing skip; type checking and build pass. RV1106 pathing completes with the local change, though its downstream routing snapshot changes.

Before	After

[vercel]

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Project	Deployment	Actions	Updated
rectdiff	Ready	Preview	Sep 11, 2026 7:22pm UTC

[0hmX]

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[mohan-bee]

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[mohan-bee]

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[seveibar]

use a solver and have a clearer graphic showing what is happening with the nodes

i don't think it is at all obvious from your screenshot what's happening, you need more graphics, probably a video, just to understand it yourself, you can then commit a simplified visualization that explains it in a PR