[BUG] Consistent Bun crash (incorrect alignment) on Windows 11 ARM64 at ~82 seconds

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

On Windows 11 ARM64, the Claude Code VS Code extension consistently crashes after ~82 seconds with a Bun runtime panic:

panic: incorrect alignment

This happens reliably during extension runtime (not a one-off). It appears to be a Bun crash that takes down the extension process.

What Should Happen?

Claude Code extension should remain running and usable; no runtime panic.

Error Messages/Logs

Elapsed: ~82000ms | User: ~900ms | Sys: ~1400ms
RSS: 0.46-0.63GB | Peak: 0.57-0.66GB

panic(thread XXXXX): incorrect alignment
oh no: Bun has crashed. This indicates a bug in Bun, not your code.

Steps to Reproduce

Environment

• OS: Windows 11 ARM64
• Claude Code VS Code extension: v2.1.49 (win32-arm64)
• Bundled/runtime Bun version: v1.3.10
• Repro frequency: 100% (crashes consistently at ~82 seconds)

Steps to Reproduce

1. Install Claude Code VS Code extension v2.1.49 on Windows 11 ARM64.
2. Open VS Code and start Claude Code (default behavior / normal usage).
3. Wait ~82 seconds (crash occurs consistently around this time).

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.49 (win32-arm64)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

Notes / Context

• This appears related to Bun's "incorrect alignment" panic seen in other Windows crash reports, but this repro is on Windows ARM64 and occurs inside the Claude Code VS Code extension runtime.