CHW-4940 CLINonceInvalid

invalid nonce; expected a hex string of 16-128 characters

Default message: invalid nonce; expected a hex string of 16-128 characters
HTTP status: 400 (client)

Problem. The nonce was missing, non-hex, or fell outside the [16, 128]-character bound. Cause. Emitted by /api/auth/cli/init and /api/auth/cli/session. Fix. Generate a fresh hex nonce of 16-128 characters and retry. HTTP 400.