Function ensure_storage_credits_t7 

async fn ensure_storage_credits_t7<P>(provider: &P, command: &str) -> Result<()>
where
    P: Provider<TempoNetwork>,

The StorageCredits precompile only exists on T7+; fail early with a clear message instead of surfacing a raw revert. Fall back to a code check when the RPC lacks the hardfork query.