Add PCB keepout outlines

[ShiboSoftwareDev]

Why

Altium can define a keepout as a stroked Track or Arc boundary. The existing pcb_keepout element only represented rectangles and circles, so these boundaries could not be preserved without changing their geometry or meaning.

These boundaries are outlines rather than polygons: many are open, and their interior is not a filled keepout region.

What changed

• Extend the existing pcb_keepout element with shape: "outline"
• Store its geometry in outline and preserve its stroke_width
• Require at least two outline points

This does not introduce another Circuit JSON element. It adds the missing outline geometry to the existing keepout element.

Validation

• bun test --max-concurrency=1 — 316 pass
• bun run build
• bunx tsc --noEmit
• bun run lint:zod
• bun run check-snake-case
• Biome formatting check on both changed files

[seveibar]

this violates ambiguous suffix rules

it there exists pcb_keepout, then you cannot introduce a specific suffix.

[tscircuitbot]

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Thank you for your contribution! 🎉

PR Rating: ⭐⭐
Impact: Minor

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