Add courtyard circle support

[techmannih]

Summary

Adds support for converting pcb_courtyard_circle circuit-json elements into <courtyardcircle /> in generated tscircuit footprints.

What Changed

• added pcb_courtyard_circle handling in generateFootprintTsx
• emitted <courtyardcircle pcbX={...} pcbY={...} radius={...} layer="..." />
• extended the courtyard round-trip test to cover circle support
• bumped circuit-json from ^0.0.391 to ^0.0.423 so the newer courtyard circle type/accessor is available

Why

Courtyard outlines and rects were already supported, but courtyard circles were being skipped. This made the converter incomplete for footprints that use circular courtyard geometry.

Impact

Footprints containing pcb_courtyard_circle now round-trip correctly from circuit-json to generated tscircuit code and back.

Validation

• bunx tsc --noEmit
• bun test

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[tscircuitbot]

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Thank you for your contribution! 🎉

PR Rating: ⭐⭐
Impact: Minor

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