Function call_driver_cmd 

pub async fn call_driver_cmd(
    atlas: &mut AtlasClient,
    provider_id: &str,
    driver_contract: &str,
    cmd: u32,
    config_json: String,
    who: &str,
) -> Result<String>

Issue one Driver(cmd) RPC against a freshly-connected channel, then release the channel. Returns the response’s state string on success; bails when ok=false or the RPC itself fails. Mirrors rbnx-cli’s boot behaviour for both CMD_INIT and CMD_ACTIVATE so Soma drives the same lifecycle transitions.

who shows up in every error message so callers can attribute failures to a specific package without re-wrapping each return.