pub fn lookup_signer(from: Address) -> Result<TempoLookup>Expand description
Looks up a signer for the given address in Tempo’s keys.toml.
Returns TempoLookup::Direct if a direct-mode (EOA) key is found,
TempoLookup::Keychain if a keychain-mode access key is found,
or TempoLookup::NotFound if no entry matches.