[BUG] Personal account private repo shows "No branches found" in claude.ai/code

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?

What's Wrong?
When adding a personal GitHub repo to claude.ai/code by URL, the picker
finds the repo but returns "No branches found" instead of listing branches.

What Should Happen?

Branches for my private personal repo should be listed so I can select one and start a Claude Code session.

Error Messages/Logs

No error message displayed. The UI shows "No branches found" 
under the repo URL https://github.com/GordonArber/SportsAI

This is a silent failure — no stack trace or error code is surfaced.

Related known issues: #12839, #18467, #27155

Steps to Reproduce

Steps to Reproduce

1. Go to claude.ai/code
2. Click + to add a new session
3. Paste repo URL: https://github.com/GordonArber/SportsAI
4. Observe "No branches found"

Claude Model

Other

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

N/A - this is a claude.ai/code web UI issue, not CLI

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

This repo was recently created and has never successfully shown branches
in claude.ai/code. The Claude GitHub App is installed with "All repositories"
access on my personal account (GordonArber). Other repos work fine.

GitHub username: GordonArber
Repo: https://github.com/GordonArber/SportsAI

Requesting a backend repo index reset for this account.