[BUG] Extension fails to activate on Windows in v2.1.136

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?

Bug: Extension fails to activate on Windows in v2.1.136

Claude Code Version: 2.1.136
OS: Windows
VS Code Version: (add yours here)

Description:
After updating to v2.1.136, the extension fails to activate on Windows. The sidebar icon disappears and commands like claude-vscode.editor.openLast stop working.

Error in Developer Tools console:

Activating extension 'Anthropic.claude-code' failed: The argument 'filename' must be a file URL object, file URL string, or absolute path string. Received 'file:///home/runner/work/claude-cli-internal/claude-cli-internal/build-agent-sdk/sdk.mjs'

The path file:///home/runner/work/... appears to be a Linux path hardcoded in the build, which causes the extension to fail on Windows.

Steps to reproduce:

1. Install or update to v2.1.136 on Windows
2. Open VS Code
3. Extension fails to activate

Expected behavior: Extension activates normally.

Workaround: Rolling back to v2.1.133 restores functionality.

What Should Happen?

Extension activates normally and sidebar icon is visible in the Activity Bar.

Error Messages/Logs

Steps to Reproduce

1. Install or update to v2.1.136 on Windows
2. Open VS Code
3. Extension fails to activate

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.136

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_