chore: Add changeset for StaticJsonRpcProvider fix

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: Royal-lobster

.changeset/static-rpc-provider.md

@@ -0,0 +1,9 @@
+---
+"@iqai/mcp-polymarket": patch
+---
+
+Fix network detection errors with flaky RPC endpoints
+
+- Use StaticJsonRpcProvider instead of JsonRpcProvider to bypass network auto-detection
+- Fix signature type auto-detection being overwritten during config merge
+- Skip approval checks for proxy wallet mode (signature type 2) since approvals are managed via Polymarket UI