Nonce Manager Backup sender nonce tracker for Stacks transactions. Use canonical payment-status polling by as the primary x402 state machine; use this tool for local nonce coordination and recovery when a fresh sender nonce is actually needed. Problem Each skill independently fetches nonce from Hiro API. When tasks fire back-to-back (before mempool clears), they grab the same nonce and collide with or errors. Solution Single file-locked nonce state at . Skills call to get the next nonce (atomically incremented), and after the transaction confirms or fails. If state is stale ( 5 min), auto-res…