fix(agent): use zod/v4 imports in agent-server (#1550)

Author: tatoalo

packages/agent/src/server/bin.ts

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 import { Command } from "commander";
-import { z } from "zod";
+import { z } from "zod/v4";
 import { AgentServer } from "./agent-server";
 import { claudeCodeConfigSchema, mcpServersSchema } from "./schemas";
 

packages/agent/src/server/schemas.ts

@@ -1,4 +1,4 @@
-import { z } from "zod";
+import { z } from "zod/v4";
 
 const httpHeaderSchema = z.object({
   name: z.string(),