fix(docs): refresh qa lab plugin inventory

docs/.generated/plugin-sdk-api-baseline.sha256

@@ -1,2 +1,2 @@
-662fb06350febfb03f9f1b0732f545fc115d88f9508c89671cfe7c7c6458d05c  plugin-sdk-api-baseline.json
-4f58b9ddb2e35064f415c10c38fa40c2c8b5789037acb21798402fb93617ac79  plugin-sdk-api-baseline.jsonl
+194d38783bc97cf2c47804d2380e8606022558d3309c62d18379077d7b6ec11d  plugin-sdk-api-baseline.json
+612407270d5b049bf0e1fb94ab8bcc50c676eb4005e5fbf476135c73eb32ab29  plugin-sdk-api-baseline.jsonl

docs/plugins/reference/qa-lab.md

@@ -16,4 +16,4 @@ OpenClaw QA lab plugin with private debugger UI and scenario runner.
 
 ## Surface
 
-plugin
+contracts: webSearchProviders

extensions/qa-lab/openclaw.plugin.json

@@ -1,5 +1,6 @@
 {
   "id": "qa-lab",
+  "description": "OpenClaw QA lab plugin with private debugger UI and scenario runner.",
   "activation": {
     "onStartup": false
   },