Combine nearby same-net trace segments

[thebasedcapital]

Summary

• add a SameNetTraceCombinerSolver pipeline phase after trace cleanup and before relabeling
• snap close, parallel, internal same-net trace segments onto a shared route
• preserve boundary segments so pin anchors are not moved
• skip candidate snaps that would introduce chip collisions or cross other-net traces
• add focused coverage for same-net combining, different-net safety, collision safety, and pin anchoring
• update visual snapshots for the examples whose same-net routes are intentionally consolidated

Fixes #29
/claim #29

Tests

• bunx tsc --noEmit
• bun run build
• bun test tests/solvers/SameNetTraceCombinerSolver.test.ts with bunfig preload temporarily disabled because install used --ignore-scripts for safety, so sharp's native postinstall artifact was not present
• bunx biome format
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 20, 2026 4:12am