Local disk creation fails: client rejects size_gb but server requires it

When configuring a local disk in .miren/app.toml:

[[services.web.disks]]
name = "data"
provider = "local"
mount_path = "/miren/data/local"

The server rejects the deploy with:

disk "data" does not exist; set size_gb to auto-create it

But adding size_gb = 1 causes the client to reject it:

service web: disk[0] (data) size_gb is not supported for local disks

So there's no valid config that creates a new local disk — the client and server disagree on whether size_gb is allowed for local provider.