fix: prevent release failure when SDK version already published (#145)

The release script runs `npm publish` for the SDK sub-package after
`changeset publish`. If the SDK version is already on npm (e.g. from a
prior release run), npm returns 403 and fails the whole CI job.

Redirect stderr and fall back gracefully so the Release action stays
green on re-runs.

Fixes the failing Release action:
https://github.com/ReScienceLab/agent-world-network/actions/runs/23436588741

Author: Jing-yilin

.changeset/fix-release-idempotent.md

@@ -0,0 +1,5 @@
+---
+"@resciencelab/agent-world-network": patch
+---
+
+fix: prevent release failure when SDK version already published

package.json

@@ -35,7 +35,7 @@
     "build": "tsc",
     "dev": "tsc --watch",
     "version": "changeset version && node scripts/sync-version.mjs",
-    "release": "npm run build && npm --prefix packages/agent-world-sdk run build && changeset publish && cd packages/agent-world-sdk && npm publish --access public",
+    "release": "npm run build && npm --prefix packages/agent-world-sdk run build && changeset publish && cd packages/agent-world-sdk && (npm publish --access public 2>/dev/null || echo 'SDK already published, skipping')",
     "prepublishOnly": "npm run build"
   },
   "publishConfig": {