Connects x402 (on-chain USDC via Base) and CRDT token system (Automerge cUSDC)
in both directions: on-chain payments auto-mint cUSDC to payer's DID, and users
can pay with cUSDC balance via new "crdt" payment scheme. 402 responses now
return both exact and crdt payment options.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
