[BUG] Cowork readiness checker reports "ready" on Windows 11 Home but Cowork tab never appears — OS misidentified as Windows 10

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?

Readiness checker output: See attached screenshot. Checker reports "Windows version 10.0 build 26200" and "edition: Core" — actual OS is Windows 11 Home. Checker incorrectly declares "ready for Cowork" but the Cowork tab does not appear.
It says "Windows version — 10.0 build 26200" — that's the bug. Build 26200 is Windows 11, but the checker is reading the version number 10.0 (which Windows 11 still uses internally) and incorrectly reporting it as Windows 10.
It says "Windows edition — Core" — "Core" is Microsoft's internal name for the Home edition, and the checker isn't translating that to "Home" properly either.
Ironically it says "This computer is ready for Cowork" — but the Cowork tab never appears, which is the other bug.

<img width="369" height="247" alt="Image" src="https://github.com/user-attachments/assets/f6976dc6-5187-460a-bf9b-9c6084d75f24" />

<img width="233" height="51" alt="Image" src="https://github.com/user-attachments/assets/de37f03f-9790-4969-921c-0c9cbbca5dfe" />

What Should Happen?

should be showing Claude cowork.

Error Messages/Logs

Steps to Reproduce

open claude

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.3109.0.0

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_