minor: refine model selection

packages/llm/src/config.ts

@@ -1,4 +1,12 @@
 import { z } from "zod";
+import dotenv from "dotenv";
+import path from "path";
+
+// Load environment variables from .env file
+dotenv.config();
+// In a monorepo, the cwd might be a package subdirectory, so check parent directories as well
+dotenv.config({ path: path.resolve(process.cwd(), "../.env") });
+dotenv.config({ path: path.resolve(process.cwd(), "../../.env") });
 
 const LLMConfigSchema = z.object({
   GOOGLE_API_KEY: z.string().min(1, "GOOGLE_API_KEY is required"),

packages/llm/src/index.ts

@@ -1 +1,3 @@
 export * from "./llm.js";
+export * from "./config.js";
+export * from "./providers/google-genai.js";

packages/llm/src/providers/google-genai.ts

@@ -9,7 +9,7 @@ export class GeminiProvider implements ILLMProvider {
   constructor(apiKey: string) {
     this.model = new ChatGoogleGenerativeAI({
       apiKey,
-      model: "gemini-3-flash",
+      model: "gemini-2.5-flash",
     });
   }