chore: import upstream snapshot with attribution

showcase/scripts/__tests__/extract-starter.test.ts

@@ -0,0 +1,29 @@
+import { describe, it, expect } from "vitest";
+import fs from "fs";
+import os from "os";
+import path from "path";
+import { execFileSync } from "child_process";
+import { execOptsFor } from "./test-cleanup";
+import { SCRIPTS_DIR } from "./paths";
+
+describe("extract-starter", () => {
+  it("adds .copilotkit/ to generated starter .gitignore", () => {
+    const outDir = fs.mkdtempSync(path.join(os.tmpdir(), "starter-"));
+
+    try {
+      execFileSync(
+        "npx",
+        ["tsx", "extract-starter.ts", "langgraph-python", outDir],
+        execOptsFor(SCRIPTS_DIR),
+      );
+
+      const gitignore = fs.readFileSync(
+        path.join(outDir, ".gitignore"),
+        "utf-8",
+      );
+      expect(gitignore.split(/\r?\n/)).toContain(".copilotkit/");
+    } finally {
+      fs.rmSync(outDir, { recursive: true, force: true });
+    }
+  });
+});