Coalesce same-net trace segments

[vinaykrsinghal-stage]

Summary

• Adds a post-cleanup same-net trace coalescing pass that trims redundant endpoint overlap already covered by another same-net trace and snaps close overlapping internal same-net segments onto a shared run
• Rejects coalescing candidates that would introduce a different-net trace crossing
• Updates affected example snapshots, including example29, where the pass removes repeated same-net stubs

/claim #29
/claim #34

Validation

• bun test
• bun run format:check
• bun run build
• git diff --check

AI-assisted with OpenAI Codex; I reviewed the diff, visual snapshot changes, and local verification before submitting.

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 16, 2026 0:32am