Add solver repro for fixed GND label trace overlap

[rushabhcodes]

Move the fixed-GND-label overlap reproduction from tscircuit/core#3919 into schematic-trace-solver so the captured routing input and output can be investigated directly.

The case comes from SparkFun's VEML7700 board, reduced in core to a chip, capacitor, LED, and manually positioned GND label. The ground wire crosses the fixed label near the chip. The expected end-to-end behavior is to preserve the label position and route other wire segments clear of its bounds.

The fixture captures solver:started input from core PR #3919 at deb549e8. Only symbol names and net label display text are added for readability; routing geometry is unchanged. Like neighboring repros, the test runs SchematicTracePipelineSolver and uses toMatchSolverSnapshot for the standard solver debug and schematic views. A geometry assertion records the current ground route crossing the original fixed label's bounds.

Core omits the explicitly positioned label from the captured solver input, so that label is absent from the solver snapshot. The test does not inject it into the rendered output. This reproduces an integration failure; it does not establish that the solver ignored a supplied obstacle. A fix needs to address how fixed-label geometry is supplied and preserved. This PR contains no routing implementation changes.

Validation:

• bun test tests/repros/repro-fixed-gnd-label-trace-overlap.test.ts passes against the regenerated snapshot without updating it.
• bunx tsc --noEmit passes.
• Visually inspected the shared debug/schematic snapshot.
• Formatting and whitespace checks pass.

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Project	Deployment	Actions	Updated
schematic-trace-solver	Ready	Preview	Sep 12, 2026 8:52pm UTC

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