Update Pi package namespace to @earendil-works

[ThewindMom]

Summary

• switch Pi imports from @mariozechner/* to current @earendil-works/* packages
• add explicit @earendil-works/pi-ai peer/dev dependency for exported message types
• refresh package-lock.json against the updated package namespace

Verification

• npm test

[Michaelliv]

Closed in favor of #20, which reapplies this namespace migration from our repo and adds pinned @earendil-works/pi-* versions. Thanks for the contribution!