Merge close same-net trace lines

[Monster5860]

Closes #34.

/claim #34

Summary

• add a cleanup pass that snaps nearby overlapping same-net horizontal or vertical interior trace segments onto existing anchor coordinates
• preserve endpoint trace segments and trace identities while updating branch path geometry
• simplify paths after snapping and cover horizontal, vertical, and different-net cases
• update affected example SVG snapshots for the expected visual line alignment changes

Tests

• bun run format:check
• bunx tsc --noEmit
• bun test -> 73 pass, 4 skip, 0 fail

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Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	Jun 17, 2026 4:10am

[Monster5860]

Local validation is now complete on the latest commit:\n\n- bun run format:check\n- bunx tsc --noEmit\n- bun test -> 73 pass, 4 skip, 0 fail\n\nThe fork PR workflows still show action_required, so they appear to be waiting for maintainer approval before running on GitHub Actions.