Merge pull request 'fix: declare prompt_rules tool in contracts.tools' (#2) from fix/declare-contracts-tools into main

plugin/openclaw.plugin.json

@@ -17,5 +17,10 @@
         "description": "Path to rules.json (default: {pluginDir}/rules.json)"
       }
     }
+  },
+  "contracts": {
+    "tools": [
+      "prompt_rules"
+    ]
   }
-}
+}