fix(mastra): build copilotkit subpackage properly in tsup config

Signed-off-by: Tyler Slaton <[email protected]>

Author: tylerslaton

typescript-sdk/integrations/mastra/tsup.config.ts

@@ -1,7 +1,10 @@
 import { defineConfig } from "tsup";
 
 export default defineConfig({
-  entry: ["src/index.ts"],
+  entry: {
+    index: "src/index.ts",
+    copilotkit: "src/copilotkit.ts",
+  },
   format: ["cjs", "esm"],
   dts: true,
   splitting: false,