Function requirements 

pub fn requirements(
    store: &LocalFsStore,
    registry: &EnvPackRegistry,
    flags: &OpFlags,
    payload: Option<CredentialsRequirementsPayload>,
) -> Result<OpOutcome, OpError>

op credentials requirements. Resolves the env’s deployer handler through the registry, runs the C1 contract’s probes, returns the per-check report.