fix: CDP mode hanging when using chrome://inspect remote debugging

- Add isCdpApiAvailable() to verify CDP HTTP JSON API before using endpoint
- Chrome's chrome://inspect#remote-debugging writes DevToolsActivePort but
  its CDP endpoint is incompatible with Playwright connectOverCDP (init
  succeeds but all tool calls hang silently)
- Add CDP readiness probe in connect() to catch unresponsive endpoints
- Skip tab cleanup in close() for CDP mode (no bridge tabs to clean)
- Add PlaywrightMCPMode tracking for extension vs CDP lifecycle policy

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@jackwener/opencli",
-  "version": "0.4.5",
+  "version": "0.4.6",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@jackwener/opencli",
-      "version": "0.4.5",
+      "version": "0.4.6",
       "license": "BSD-3-Clause",
       "dependencies": {
         "chalk": "^5.3.0",