fix: update smart model name to claude-opus-4.5 in README and code example

Author: roryp

nodejs/examples/README.md

@@ -5,7 +5,7 @@ Two AI models take turns telling a knock-knock joke while measuring response tim
 ## Models Used
 
 - **Fast model**: `gpt-4.1` - Delivers the joke setup and punchline
-- **Smart model**: `claude-sonnet-4.5` - Responds to the joke
+- **Smart model**: `claude-opus-4.5` - Responds to the joke (premium model)
 
 ## Run
 
@@ -21,28 +21,28 @@ npx tsx examples/knock-knock.ts
 🚪 Knock-Knock Joke: Two Models Battle!
 
 Fast model: gpt-4.1
-Smart model: claude-sonnet-4.5
+Smart model: claude-opus-4.5
 
 ──────────────────────────────────────────────────
 🏃 gpt-4.1: Knock knock!
-🧠 claude-sonnet-4.5: Who's there?
+🧠 claude-opus-4.5: Who's there?
 🏃 gpt-4.1: Olive
-🧠 claude-sonnet-4.5: Olive who?
+🧠 claude-opus-4.5: Olive who?
 🏃 gpt-4.1: Olive you and I miss you!
 ──────────────────────────────────────────────────
 
 ⏱️  Response Times:
 
-🏃 gpt-4.1              | Knock knock  |  4542ms
-🧠 claude-sonnet-4.5    | Who's there? |  3533ms
-🏃 gpt-4.1              | Setup        |  1428ms
-🧠 claude-sonnet-4.5    | Who?         |  4321ms
-🏃 gpt-4.1              | Punchline    |  2473ms
+🏃 gpt-4.1              | Knock knock  |  4490ms
+🧠 claude-opus-4.5      | Who's there? |  2478ms
+🏃 gpt-4.1              | Setup        |  1289ms
+🧠 claude-opus-4.5      | Who?         |  2713ms
+🏃 gpt-4.1              | Punchline    |  1257ms
 ──────────────────────────────────────────────────
-🏃 gpt-4.1 total: 8443ms (3 turns)
-🧠 claude-sonnet-4.5 total: 7854ms (2 turns)
+🏃 gpt-4.1 total: 7035ms (3 turns)
+🧠 claude-opus-4.5 total: 5191ms (2 turns)
 
-🏆 claude-sonnet-4.5 was faster!
+🏆 claude-opus-4.5 was faster!
 ```
 
 ## Customize
@@ -51,5 +51,5 @@ Edit the constants at the top of `knock-knock.ts` to try different models:
 
 ```typescript
 const FAST_MODEL = "gpt-4.1";
-const SMART_MODEL = "claude-sonnet-4.5";
+const SMART_MODEL = "claude-opus-4.5";
 ```

nodejs/examples/knock-knock.ts

@@ -6,7 +6,7 @@
 import { CopilotClient } from "../src/index.js";
 
 const FAST_MODEL = "gpt-4.1";
-const SMART_MODEL = "claude-sonnet-4.5";
+const SMART_MODEL = "claude-opus-4.5";
 
 async function main() {
     console.log("🚪 Knock-Knock Joke: Two Models Battle!\n");