Function bind_channel_identity_into 

pub fn bind_channel_identity_into(
    config: &mut Config,
    channel_type: &str,
    alias: &str,
    identity: &str,
) -> Result<bool, Error>

Add identity to the peer group bound to <type>.<alias> in-place.

Returns Ok(true) when the identity was newly added, Ok(false) when it was already present. Pure config mutation — no disk write, no daemon restart — so it is the single core shared by the CLI (bind_telegram_identity) and the gateway bind endpoint. The channel field is the dotted <type>.<alias> ref so authorization stays scoped to the bound alias; a bare type would broaden the peer across every alias of that type.