Moving the copilot-sdk cookbook content in here

cookbook/copilot-sdk/nodejs/recipe/persisting-sessions.ts

@@ -0,0 +1,37 @@
+import { CopilotClient } from "@github/copilot-sdk";
+
+const client = new CopilotClient();
+await client.start();
+
+// Create a session with a memorable ID
+const session = await client.createSession({
+    sessionId: "user-123-conversation",
+    model: "gpt-5",
+});
+
+await session.sendAndWait({ prompt: "Let's discuss TypeScript generics" });
+console.log(`Session created: ${session.sessionId}`);
+
+// Destroy session but keep data on disk
+await session.destroy();
+console.log("Session destroyed (state persisted)");
+
+// Resume the previous session
+const resumed = await client.resumeSession("user-123-conversation");
+console.log(`Resumed: ${resumed.sessionId}`);
+
+await resumed.sendAndWait({ prompt: "What were we discussing?" });
+
+// List sessions
+const sessions = await client.listSessions();
+console.log(
+    "Sessions:",
+    sessions.map((s) => s.sessionId)
+);
+
+// Delete session permanently
+await client.deleteSession("user-123-conversation");
+console.log("Session deleted");
+
+await resumed.destroy();
+await client.stop();