Implement custom AI behavior for Inky (cyan ghost)

[nucleartide]

Changelog

What is the "shippable increment" of this pull request?

...

Dev checklist

• First draft. Implement a working first pass at the feature.
• Final draft. Perform a general review of Files changed and revise anything that needs to be cleaned up.
• Scientific debugging. Ensure that all features within this pull request have been scientifically debugged. For experimental observations, you can slap a UPROPERTY(VisibleAnywhere) on all data fields, but you can also draw debug geometry for trickier logic.
• Playtest. Playtest through game to ensure everything works.
• Merge and release. Merge into master, cut a new build in Unreal, and upload a GitHub release.

After a break

• Summary. Collect changelog items from Files changed.
• Priorities. Prioritize items on work board.
• Next task. Tee up a pull request for the next feature.