Experiment with ACP (Agent Context Protocol)

[cloud-on-prem]

This should help us offload most of the functionality to Goose rather than duplicating it in the client.

https://agentcommunicationprotocol.dev/introduction/welcome

block/goose#4511

[michaelneale]

great - yeah just merged the upstream one on goose.

[cloud-on-prem]

This should be fixed by #28
Please test it and let me know 🙏