chore(node-sdk): release 2.1.0

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@elydora/sdk",
-  "version": "2.0.1",
+  "version": "2.1.0",
   "description": "Node.js/TypeScript SDK for the Elydora tamper-evident audit platform",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",