CLI 3.0.0

The CLI now requires the current Manyfold API contract. Upgrade the API before upgrading the CLI when running a self-hosted installation.

mf whoami uses /api/auth/whoami exclusively. A missing endpoint fails with HTTP 404 instead of retrying /api/auth/me and constructing a legacy identity. Login and setup continue to use their existing account endpoint.

Structured API errors must contain a nested error object. Legacy top-level code, message, and details fields are no longer interpreted as error metadata. When an error response does not follow this contract, the CLI uses the HTTP status and does not print the unparsed response body.

Existing profiles, runtime credentials, and current identity kinds remain valid. See the self-hosting upgrade instructions before crossing older API migration boundaries.