feat(actions): add plan, update done & web search

src/lib/agents/search/researcher/actions/done.ts

@@ -4,11 +4,9 @@ import { ResearchAction } from '../../types';
 const doneAction: ResearchAction<any> = {
   name: 'done',
   description:
-    "Indicates that the research process is complete and no further actions are needed. Use this action when you have gathered sufficient information to answer the user's query.",
+    'Only call this after ___plan AND after any other needed tool calls when you truly have enough to answer. Do not call if information is still missing.',
   enabled: (_) => true,
-  schema: z.object({
-    type: z.literal('done'),
-  }),
+  schema: z.object({}),
   execute: async (params, additionalConfig) => {
     return {
       type: 'done',