feat(agent): add document-writer agent for technical documentation

src/agents/index.ts

@@ -3,10 +3,12 @@ import { oracleAgent } from "./oracle"
 import { librarianAgent } from "./librarian"
 import { exploreAgent } from "./explore"
 import { frontendUiUxEngineerAgent } from "./frontend-ui-ux-engineer"
+import { documentWriterAgent } from "./document-writer"
 
 export const builtinAgents: Record<string, AgentConfig> = {
   oracle: oracleAgent,
   librarian: librarianAgent,
   explore: exploreAgent,
   "frontend-ui-ux-engineer": frontendUiUxEngineerAgent,
+  "document-writer": documentWriterAgent,
 }