Reproduce reused copper-pour bounds between breakouts

[ShiboSoftwareDev]

Summary

• add an exact two-breakout regression fixture for outline-less, unbroken copper pours
• record the Simple Route JSON received by each real custom breakout autorouter
• demonstrate that the second breakout incorrectly receives the first breakout's 8mm x 8mm pour bounds
• assert that both phases otherwise retain the same non-pour obstacle scope and that the second phase retains the first phase's routed traces

Why this repro is needed

A board subcircuit can contain several custom breakout routing groups. The board-level copper pours belong to every phase, but an outline-less pour must be represented using the bounds of the breakout that is currently routing. Core currently builds the board SRJ once, selecting the first matching PCB group, and both breakout phases reuse those pour obstacles. That gives the right-hand autorouter a false copper plane at the left-hand breakout and no copper plane where its real breakout sits.

The test uses the real phased-routing handoff rather than calling the SRJ utility in isolation, because the bug depends on how Core constructs and filters phase inputs. It intentionally leaves the failing coordinates in the repro commit. The stacked fix changes only the second breakout's expected center from x = -10 to x = 10; the non-pour obstacle and prior-trace assertions stay unchanged.

This is a stacked, test-first alternative to #3389. #3389 currently performs its substitution only in the connection-reroute branch, which does not execute for this ordinary custom-breakout fixture.

Test plan

• bun test tests/breakout/active-breakout-copper-pour-bounds.test.tsx

Stacked fix: base the follow-up PR on this branch.

[vercel]

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

Project	Deployment	Actions	Updated (UTC)
tscircuit-core-benchmarks	Ready	Preview	Aug 24, 2026 4:38am