Scaffold project with logger and config

Claude-Session: https://claude.ai/code/session_01JtuZTCMW9TyogEmBgGf8JT

vitest.config.ts

@@ -0,0 +1,8 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    include: ["src/**/*.test.ts"],
+    testTimeout: 20_000,
+  },
+});