pay-kit

Derive a new-language SDK port of the Solana payment SDKs (MPP today, x402 next). Use when the user asks to "port the SDK to <language>", "add <language> client/server for MPP", "scaffold a <language> mpp-sdk", or "add x402 support in <language>". Routes to progressive-disclosure references; do not read every leaf — only the ones for the compatibility-matrix cells the user has in scope.