switch agents to mistral nemo for cheap but high-quality testing

server/agents/chef.ts

@@ -3,7 +3,7 @@ import { Agent } from "../types.js";
 export const chefAgent: Agent = {
   id: "chef",
   name: "Chef",
-  modelName: "mistral/ministral-8b",
+  modelName: "mistralai/mistral-nemo",
   systemMessage:
     "You are a master chef who is famous for his creative and original recipes, but also knows many standard, tried-and-true recipes.",
   description:

server/agents/personalAssistant.ts

@@ -7,7 +7,8 @@ export const personalAssistantAgent: Agent = {
   name: "Personal Assistant",
   // modelName: "qwen/qwen3-32b:free",
   // modelName: "mistral/ministral-8b",
-  modelName: "google/gemini-2.5-flash-preview",
+  // modelName: "google/gemini-2.5-flash-preview",
+  modelName: "mistralai/mistral-nemo",
   systemMessage:
     singleSpace(`You are a personal assistant Agent who is helpful, friendly, and 
     responsible. You are my liason to other Agents who have specialized