Add routed bus skew constraints

[seveibar]

Summary

• add opt-in LengthMatchingGroup constraints for matching every connection in a routed bus to a maximum longest-to-shortest skew
• account for immutable routed copper outside the supplied geometry through per-connection fixed-length offsets
• expose the same constraint through PostProcessingSolver, including final reconstructed-copper validation
• allow ordered, overlapping groups so a bus-wide skew target can be followed by tighter differential-pair matching

Why

Bus-tracer needs to route the fanout-to-fanout region as one bus, then apply the electrical constraints declared by <bus /> and <differentialpair />. The existing length matcher only accepted two-member differential-pair constraints and could not account for the fixed fanout copper at either end.

This API is entirely opt-in. Supplying routed traces without a length-matching group preserves the existing behavior.

Validation

• bun test --timeout 9999999 — 60 pass, 0 fail
• bun run typecheck
• bun run build
• bun run typecheck:structure
• bun run format:check
• added and visually reviewed SVG snapshots for direct solver and post-processing coverage

[vercel]

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Project	Deployment	Actions	Updated (UTC)
differential-pairs-solver	Ready	Preview	Aug 3, 2026 9:59pm