fix: enforce plugin config schemas (#1272) (thanks @thewilloftheshadow)

Co-authored-by: thewilloftheshadow <thewilloftheshadow@users.noreply.github.com>

extensions/google-gemini-cli-auth/clawdbot.plugin.json

@@ -0,0 +1,11 @@
+{
+  "id": "google-gemini-cli-auth",
+  "providers": [
+    "google-gemini-cli"
+  ],
+  "configSchema": {
+    "type": "object",
+    "additionalProperties": false,
+    "properties": {}
+  }
+}