feat: replaced csl with evolutionsdk for cardano transaction parsing

typescript/packages/mechanisms/cardano/README.md

@@ -28,13 +28,9 @@ Cardano native tokens are identified as `${policyId}.${assetNameHex}`, e.g. USDM
 c48cbb3d5e57ed56e276bc45f99ab39abe94e6cd7ac39fb402da47ad.0014df105553444d
 ```
 
-## Optional Cardano serialization library
+## Transaction decoding
 
-This package depends on `@emurgo/cardano-serialization-lib-nodejs` as a _peer dependency_ to keep the TypeScript bundle light. The dep is resolved lazily inside `decodeCardanoTransaction` so the package can be imported without it; verification calls require it.
-
-```bash
-pnpm add @emurgo/cardano-serialization-lib-nodejs
-```
+CBOR transaction decoding in the facilitator uses Intersect's [Evolution SDK](https://www.npmjs.com/package/@evolution-sdk/evolution) — a pure-TypeScript Cardano serialization library with no WASM. It is bundled as a regular dependency; nothing extra to install.
 
 ## Asset transfer methods
 

typescript/packages/mechanisms/cardano/package.json

@@ -42,16 +42,9 @@
     "vitest": "^3.0.5"
   },
   "dependencies": {
+    "@evolution-sdk/evolution": "^0.5.9",
     "@x402/core": "workspace:*"
   },
-  "peerDependencies": {
-    "@emurgo/cardano-serialization-lib-nodejs": ">=11.5.0"
-  },
-  "peerDependenciesMeta": {
-    "@emurgo/cardano-serialization-lib-nodejs": {
-      "optional": true
-    }
-  },
   "exports": {
     ".": {
       "import": {

typescript/packages/mechanisms/cardano/src/constants.ts

@@ -210,7 +210,5 @@ export const ERR_SETTLEMENT_NOT_CONFIRMED = "exact_cardano_settlement_not_confir
 export const ERR_DUPLICATE_SETTLEMENT = "duplicate_settlement";
 /** Error: the script assetTransferMethod was selected but reconstruction failed. */
 export const ERR_SCRIPT_ADDRESS_MISMATCH = "invalid_exact_cardano_payload_script_address_mismatch";
-/** Error: required Cardano SDK is not installed. */
-export const ERR_CARDANO_SDK_MISSING = "exact_cardano_sdk_missing";
 /** Error: transaction is not signed (no vkey/bootstrap witnesses present). */
 export const ERR_TRANSACTION_UNSIGNED = "invalid_exact_cardano_payload_unsigned";

typescript/packages/mechanisms/cardano/src/exact/facilitator/scheme.ts

@@ -12,7 +12,6 @@ import {
   CARDANO_NETWORKS,
   ERR_AMOUNT_INSUFFICIENT,
   ERR_ASSET_MISMATCH,
-  ERR_CARDANO_SDK_MISSING,
   ERR_CHAIN_LOOKUP_FAILED,
   ERR_DUPLICATE_SETTLEMENT,
   ERR_INVALID_PAYLOAD,
@@ -163,25 +162,12 @@ export class ExactCardanoScheme implements SchemeNetworkFacilitator {
 
       let decoded: DecodedCardanoTransaction;
       try {
-        decoded = await decodeCardanoTransaction(cardanoPayload.transaction);
+        decoded = decodeCardanoTransaction(cardanoPayload.transaction);
       } catch (cause) {
-        const message = cause instanceof Error ? cause.message : String(cause);
-        // A missing peer dep is a facilitator misconfiguration, not client error.
-        // Bubble up as a chain-lookup-style failure with a descriptive message so
-        // operators can fix the install, instead of marking valid payments as
-        // malformed CBOR.
-        if (message.startsWith(ERR_CARDANO_SDK_MISSING)) {
-          return {
-            isValid: false,
-            invalidReason: ERR_CHAIN_LOOKUP_FAILED,
-            invalidMessage: message,
-            payer: "",
-          };
-        }
         return {
           isValid: false,
           invalidReason: ERR_TRANSACTION_DECODE_FAILED,
-          invalidMessage: message,
+          invalidMessage: cause instanceof Error ? cause.message : String(cause),
           payer: "",
         };
       }