fix: support Windows agent command shims

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@game-crafttable/mcp-client",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "OAuth CLI and stdio bridge for the CraftTable MCP server",
   "repository": {
     "type": "git",
@@ -29,11 +29,13 @@
     "@modelcontextprotocol/sdk": "latest",
     "@napi-rs/keyring": "^1.3.0",
     "commander": "^14.0.0",
+    "cross-spawn": "^7.0.6",
     "jsonc-parser": "^3.3.1",
     "open": "^10.2.0"
   },
   "devDependencies": {
     "@types/node": "latest",
+    "@types/cross-spawn": "^6.0.6",
     "esbuild": "latest",
     "tsx": "latest",
     "typescript": "latest"