Function init_self_idempotent 

pub fn init_self_idempotent(
    handle: &str,
    name: Option<&str>,
    relay: Option<&str>,
) -> Result<Value>

MCP-callable init: idempotent if already inited under the same handle, errors on different-handle conflict, accepts optional –relay binding.

This is the only writeable identity-creation entry point safe to expose to agents — it can’t change the operator’s existing identity.