Add TI footprint support to eval platform config

[techmannih]

Summary

• add optional TI footprint support to eval through tiPartsEngineConfig
• wire getPlatformConfig(...) to provide a built-in ti: footprint resolver
• preserve explicit platform override behavior while safely merging projectConfig.footprintLibraryMap
• add focused tests for:
  • built-in footprint="ti:MSP430" support
  • custom projectConfig.footprintLibraryMap.ti merge behavior
  • preserving existing kicad: and jlcpcb: resolvers

Why

This prepares @tscircuit/eval to support footprint="ti:..." without requiring core changes.

The new support is opt-in through tiPartsEngineConfig, so TI integration can be enabled when needed while keeping the default platform behavior unchanged for other users.

[chatgpt-codex-connector]

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[seveibar]

We dont want to integrate ti to eval?

[seveibar]

@techmannih show users how to use a custom platform config js file with a custom parts engine in the docs- modifications to eval should not be necessary

[github-actions]

This PR has been automatically marked as stale because it has had no recent activity. It will be closed if no further activity occurs.

[github-actions]

This PR was closed because it has been inactive for 1 day since being marked as stale.