Chrome native messaging host crashes with Bun panic on Windows 11

Description

The Chrome browser extension (claude-in-chrome) never connects on Windows 11. Running claude.exe --chrome-native-host crashes immediately with a Bun runtime assertion failure.

Environment

• OS: Windows 11 Pro 10.0.26200
• Claude Code: 2.1.41
• Chrome Extension: Claude v1.0.49 (ID: fcoeoabgfenejglbffodgkkbkcdhcgfn)
• Chrome Profiles: Extension installed in Profile 1 and Profile 2

Steps to Reproduce

1. Install Claude Code 2.1.41 on Windows 11
2. Install Claude browser extension v1.0.49 from Chrome Web Store
3. Run /chrome in Claude Code — nothing happens in Chrome
4. All mcp__claude-in-chrome__* tool calls return "Browser extension is not connected"

Root Cause

Running the native host directly reveals a Bun crash:

> claude.exe --chrome-native-host

[Claude Chrome Native Host] Initializing...
[Claude Chrome Native Host] Creating socket listener: \\.\pipe\claude-mcp-browser-bridge-CarterWilliams

Bun Canary v1.3.9-canary.62 (6d2fefba) Windows x64 (baseline)
Windows v.win11_dt
CPU: sse42 avx avx2

panic(main thread): Internal assertion failure
oh no: Bun has crashed. This indicates a bug in Bun, not your code.

Crash report: https://bun.report/1.3.9/e_26d2fefbEkgggC+s1oU+vvkOu8t/uBysi5uB__qt24tCA0eNrzzCtJLcpLzFFILC5OLSrJzM9TSEvMzCktSgUAiSkKPg

Verified Configuration (all correct)

• Registry: HKCU\Software\Google\Chrome\NativeMessagingHosts\com.anthropic.claude_code_browser_extension points to correct JSON config
• Native host JSON: C:\Users\...\AppData\Roaming\Claude Code\ChromeNativeHost\com.anthropic.claude_code_browser_extension.json — correct allowed_origins with matching extension ID
• Bat file: C:\Users\...\.claude\chrome\chrome-native-host.bat exists and calls claude.exe --chrome-native-host
• claude.exe: Exists at expected path, runs correctly for all other operations
• Named pipe: claude-mcp-browser-bridge-{username} gets created but process dies immediately

The native host process creates the named pipe, then crashes before it can accept connections from Chrome. This has persisted across multiple Chrome restarts and Claude Code sessions.