render cadModel strings with Footprinter

[seveibar]

Summary

• interpret a string cadModel as a Footprinter model string and emit it on cad_component.footprinter_string
• keep the CAD model independent of the component's PCB footprint
• make an explicit Footprinter CAD string override a model supplied by a footprint resolver or parts-engine flow
• reject URL, static-asset, and library-reference strings with a clear error
• add behavior and Simple 3D snapshot coverage using a custom JSX PCB footprint with cadModel="soic8"

Depends on tscircuit/props#762 for the public prop parser and type contract.

Contract

<chip
  name="U1"
  cadModel="soic8"
>
  <footprint>
    {/* Custom PCB geometry */}
  </footprint>
</chip>

"soic8" describes only the procedural CAD model. It does not need to match or derive from the component's PCB footprint. Omitted cadModel behavior remains unchanged, and cadModel={null} still disables CAD output.

Validation

• bun test — 1,273 passed, 31 skipped, 0 failed (with the props PR linked)
• bunx tsc --noEmit
• bun run build
• bunx biome format --write on changed TypeScript files

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Project	Deployment	Actions	Updated (UTC)
tscircuit-core-benchmarks	Ready	Preview, Comment	Jul 28, 2026 6:47pm

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