fix: adding bufferutil as an optional dep

[Kylejeong2]

why

there was an issue with the alex ai endpoint deploying to vercel, where while using stagehand v3 the scripts would correctly deploy and build, but we weren't able to use them due to some bug where ws (websocket) library would need bufferutil library to run any stagehand code properly.

what changed

added bufferutil library as an optional dep: https://www.npmjs.com/package/bufferutil

test plan

ci

[changeset-bot]

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Latest commit: 4cb6763

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[greptile-apps]

Greptile Summary

• Added bufferutil@^4.0.9 as an optional dependency to resolve WebSocket performance issues when deploying to Vercel
• The bufferutil package is a recommended optional peer dependency of the ws library used for CDP WebSocket connections in lib/v3/understudy/cdp.ts

Confidence Score: 5/5

• This PR is safe to merge with minimal risk.
• Adding bufferutil as an optional dependency is the correct solution for the reported WebSocket performance issue. The package is a well-established, recommended peer dependency of the ws library. Placing it in optionalDependencies is the standard practice, allowing installations to succeed even if native compilation fails on some platforms.
• No files require special attention.

Important Files Changed

Filename	Overview
packages/core/package.json	Added bufferutil as optional dependency to improve WebSocket performance with the ws library.

Sequence Diagram

sequenceDiagram
    participant App as "Application"
    participant Stagehand as "@browserbasehq/stagehand"
    participant WS as "ws Library"
    participant Bufferutil as "bufferutil"
    App->>Stagehand: "Initialize with WebSocket"
    Stagehand->>WS: "Create WebSocket connection"
    WS->>Bufferutil: "Use for performance optimization"
    Bufferutil-->>WS: "Optimized buffer operations"
    WS-->>Stagehand: "WebSocket ready"

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[greptile-apps]

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