Moving the copilot-sdk cookbook content in here

cookbook/copilot-sdk/nodejs/multiple-sessions.md

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+# Working with Multiple Sessions
+
+Manage multiple independent conversations simultaneously.
+
+> **Runnable example:** [recipe/multiple-sessions.ts](recipe/multiple-sessions.ts)
+>
+> ```bash
+> cd recipe && npm install
+> npx tsx multiple-sessions.ts
+> # or: npm run multiple-sessions
+> ```
+
+## Example scenario
+
+You need to run multiple conversations in parallel, each with its own context and history.
+
+## Node.js
+
+```typescript
+import { CopilotClient } from "@github/copilot-sdk";
+
+const client = new CopilotClient();
+await client.start();
+
+// Create multiple independent sessions
+const session1 = await client.createSession({ model: "gpt-5" });
+const session2 = await client.createSession({ model: "gpt-5" });
+const session3 = await client.createSession({ model: "claude-sonnet-4.5" });
+
+// Each session maintains its own conversation history
+await session1.sendAndWait({ prompt: "You are helping with a Python project" });
+await session2.sendAndWait({ prompt: "You are helping with a TypeScript project" });
+await session3.sendAndWait({ prompt: "You are helping with a Go project" });
+
+// Follow-up messages stay in their respective contexts
+await session1.sendAndWait({ prompt: "How do I create a virtual environment?" });
+await session2.sendAndWait({ prompt: "How do I set up tsconfig?" });
+await session3.sendAndWait({ prompt: "How do I initialize a module?" });
+
+// Clean up all sessions
+await session1.destroy();
+await session2.destroy();
+await session3.destroy();
+await client.stop();
+```
+
+## Custom session IDs
+
+Use custom IDs for easier tracking:
+
+```typescript
+const session = await client.createSession({
+    sessionId: "user-123-chat",
+    model: "gpt-5",
+});
+
+console.log(session.sessionId); // "user-123-chat"
+```
+
+## Listing sessions
+
+```typescript
+const sessions = await client.listSessions();
+console.log(sessions);
+// [{ sessionId: "user-123-chat", ... }, ...]
+```
+
+## Deleting sessions
+
+```typescript
+// Delete a specific session
+await client.deleteSession("user-123-chat");
+```
+
+## Use cases
+
+- **Multi-user applications**: One session per user
+- **Multi-task workflows**: Separate sessions for different tasks
+- **A/B testing**: Compare responses from different models