Add resolved component exclusions to PCB keepouts

[seveibar]

Summary

• add optional excluded_pcb_component_ids to rectangular and circular pcb_keepout elements
• expose the field through the corresponding TypeScript interfaces
• verify both the direct keepout schema and any_circuit_element preserve the IDs

Why

Keepout exemptions originate as TSX selectors, but downstream DRC operates on Circuit JSON without access to core's selector engine. Persisting resolved PCB component IDs gives @tscircuit/checks and other Circuit JSON consumers a portable, stable representation of the exemption while leaving autorouting behavior unchanged.

Follow-ups

• Respect PCB keepout component exclusions checks#176 consumes this field for DRC enforcement
• Serialize keepout excludeRefs as PCB component IDs core#2958 resolves TSX selectors and serializes the IDs

Validation

• bun test — 273 passed, 0 failed
• bunx tsc --noEmit
• bun run build
• bun run lint:zod
• bun run check-snake-case
• Biome check on changed files

[tscircuitbot]

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Thank you for your contribution! 🎉

PR Rating: ⭐⭐⭐
Impact: Major

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