[BUG] VS Code extension: renamed sessions show old title until window reload

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?

The session list shows the original (old) title. The new title only appears after running Developer: Reload Window (Cmd+Shift+P → Reload Window).

What Should Happen?

The renamed session shows its new title in the session list.

Error Messages/Logs

Steps to Reproduce

1. Open the Session history panel in the Claude Code VS Code extension.
2. Hover over a session and click the rename action; set a new title and confirm.
3. Switch to any other session, then switch back to the renamed one.

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

Claude Code 2.1.143 (VS Code extension)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

The rename does persist to disk — after a window reload the new title is shown correctly.
This suggests the session-list cache in the extension isn't invalidated when a rename completes.
The CLI /rename command is not available in the VS Code extension ("/rename isn't available in this environment."), so there's no workaround other than reloading the window.