Function peek_pending_identity 

pub fn peek_pending_identity(
    pending_public_key_hex: &str,
) -> Result<UserKeypair, KeyError>

Read (without consuming) the pending identity keyed by pending_public_key_hex — what a pairing in progress signs its bootstrap traffic with, and what it establishes in the store’s own custody before the completion marker. KeyError::NoPendingIdentity if none is held under that key.