Shorten same-side rails to outward net-label columns

[hrithik18k]

Motivation

Prefer the shortest valid shared-net route so generated schematics stay compact, clear, and easy to follow.

Issue

A same-side pin pair can be routed through a long U-shaped loop even when an existing outward net-label column provides a shorter valid vertical path. This creates unnecessary wire length and makes the connection harder to read.

Fix

• detect the internal return rail in same-side orthogonal routes of any length when an outward vertical net label is present
• move the shared vertical rail onto the nearby label column when doing so shortens the route
• limit the adjustment to a small local shift and preserve unrelated routes
• keep perpendicular crossings as crossings without creating junctions
• update the existing repro snapshot to show the before/after routing difference

Testing

• bun test --timeout 30000 (407 pass, 4 skip, 0 fail)
• bunx tsc --noEmit --pretty false
• git diff --check

[vercel]

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Project	Deployment	Actions	Updated
schematic-trace-solver	Ready	Preview	Sep 18, 2026 6:01am UTC

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