[BUG] Personal account repo not visible in Routines picker despite GitHub App installed

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?

Repo: https://github.com/flowclarity-apps/claude-triage-routine
Account type: Personal account (not an org)
GitHub App: installed and shows as configured at github.com/settings/installations
Issue: "No repositories found" in Routines repo picker at claude.ai/code/routines

Related: #18467, #27155

<img width="1159" height="489" alt="Image" src="https://github.com/user-attachments/assets/24ecb33b-9b58-4659-9979-a05c3cf359b0" />

What Should Happen?

Requesting backend repo index reset for account: flowclarity-apps

Error Messages/Logs

Steps to Reproduce

N/A

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

https://claude.ai/code/routines/new

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_