fix: add same-net trace junction phase

[RYB-404]

Closes #29

Summary

• Adds a focused SameNetTraceJunctionSolver pipeline phase after trace cleanup.
• Snaps trace endpoints to nearby same-net axis-aligned segments and inserts a junction point into the target trace.
• Preserves existing trace objects/metadata instead of collapsing traces together, so downstream label placement and pin metadata remain stable.

Why this approach

There are already broader attempts for this bounty. This PR keeps the change small and non-destructive: it connects close same-net segments by sharing a concrete point, without deleting traces or changing unrelated solver phases.

Tests

• Added coverage for same-net endpoint snapping/junction insertion.
• Added coverage that close different-net segments are not modified.

Local verification

• npx @biomejs/biome@2.2.2 format --write ...
• git diff --check

Could not run Bun tests locally because bun is not installed in this Windows environment. npm install --legacy-peer-deps --no-package-lock also failed while installing sharp due to ENOSPC/native build prerequisites, so I left dependency artifacts out of the PR.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
schematic-trace-solver	Ready	Preview, Comment	May 17, 2026 5:28am