chore: update CopilotKit packages (#220)

* chore: update CopilotKit packages

Co-Authored-By: Warp <agent@warp.dev>

* Keep the lockfile describing the manifest

The bump left bun.lock recording ^1.69.0 for the runtime and ^1.39.0 for
aimock while both are pinned exact in server/package.json, and aimock's
range was loosened with no manifest change at all. Regenerated so the two
agree.

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Co-authored-by: Warp <agent@warp.dev>
Co-authored-by: David McKay <davidmckayv@users.noreply.github.com>