[BUG] /autofix-pr fails with "Claude GitHub app must be installed" despite app being installed

Description

/autofix-pr fails with the following error even though the Claude GitHub app is correctly installed and configured with access to the repository:

Autofix PR failed: can't start autofix —
The Claude GitHub app must be installed on this repository first.
https://github.com/apps/claude/installations/new

Environment

• Claude Code CLI (latest)
• Platform: WSL2 (Linux) / zsh
• Repository: CoderCoco/Hyveon (private)
• App installed: Claude GitHub App via https://github.com/apps/claude/installations/new
• Repository access: granted to CoderCoco/Hyveon

Steps to Reproduce

1. Install the Claude GitHub app and grant access to the repository
2. Run /autofix-pr in Claude Code CLI
3. Error appears despite app being installed

Expected Behavior

/autofix-pr should launch successfully since the app is installed with proper repository access.

Actual Behavior

CLI reports the app is not installed despite it being correctly configured.

Notes

This appears to be the same backend indexing issue reported in #21377 and #30872. The workaround of uninstalling and reinstalling the app did not resolve the issue.

Requesting a backend repository index reset for GitHub user: CoderCoco.