Add Aztec devnet/testnet to reference endpoints

Adds rollup_version-based lookup for Aztec chains.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

reference-rpc-endpoint.json

@@ -257,7 +257,7 @@
   "hashkey-testnet": {
     "id": 133,
     "urls": [
-      "https://testnet.hsk.xyz"
+      "https://hashkeychain-testnet.alt.technology"
     ]
   },
   "polygon": {