Add script to validate KiCad autocomplete footprints against platform loader

[seveibar]

Motivation

• Provide an automated way to verify every KiCad footprint string from the generated autocomplete file can be loaded and parsed by the platform kicad loader.
• Surface missing cache/loader issues early by running a single script that exercises the loader against the whole KicadPath union.

Description

• Add scripts/test-loading-all-kicad-footprints.ts which reads node_modules/@tscircuit/props/lib/generated/kicad-autocomplete.ts, parses the KicadPath union, and filters out .md entries.
• The script loads each footprint via getPlatformConfig().footprintLibraryMap.kicad with configurable concurrency and accumulates failures while printing progress.
• The script prints the first 20 failures and exits non-zero when any footprint fails to load or returns an empty footprintCircuitJson.

Testing

• Ran bunx tsc --noEmit and it completed successfully.
• Ran bun run scripts/test-loading-all-kicad-footprints.ts which executed against KicadPath entries and reported Done. Successes: 13370, Failures: 379 for 13749 checked entries and exited non-zero due to failures.
• Ran bun run format which formatted files successfully.

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Codex Task

[tscircuitbot]

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