Conductor, not kitchen
Fusion's hosted side coordinates runs, stores receipts, and publishes checks. By default it does not host your code or your keys. The conductor keeps time; the kitchens stay yours.
topic · local-first
Local-first: what stays on your machine, and when
By default a Fusion run executes on your machine or in your CI: code and model keys stay inside your chosen trust boundary while the control plane coordinates and stores receipts. Managed execution exists, but it is an explicit choice.