Function deleted_agent_of_rowless_block 

pub(crate) fn deleted_agent_of_rowless_block(
    mstore: &Store,
    block_id: &str,
    identity: Option<&PersistedAgentIdentity>,
) -> Option<String>

#3577: the id of the deleted agent block_id names, when the block resolved to no row (identity is None) and its agent was deleted — the builder’s last-read re-check of the gate’s refusal (Codex P1 on #3591). None whenever a row resolved, or the block names nothing deleted.