fix: rename run-mcp.js to .cjs for CommonJS compat

Package has "type": "module" so .js files are ESM. Rename to .cjs
to keep using CommonJS require() syntax.

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

Author: cevian

.mcp.json

@@ -6,7 +6,7 @@
     },
     "0pflow-local-tools": {
       "command": "node",
-      "args": ["${CLAUDE_PLUGIN_ROOT}/scripts/run-mcp.js"]
+      "args": ["${CLAUDE_PLUGIN_ROOT}/scripts/run-mcp.cjs"]
     }
   }
 }