GitHub App Installation Validation

What: Background tasks now verify that the Claude GitHub app is installed on the repository before allowing execution.

How to use: When initiating background tasks in a GitHub repository, Claude Code automatically checks if the Claude app is installed. If not, you'll receive a clear error message with installation link.

Details:

• New validation function KT2() at line 426828 checks app installation via API endpoint /api/oauth/organizations/{orgId}/code/repos/{owner}/{repo}
• GitHub repository detection function Fb() at line 426624 extracts owner/repo from git remote URL
• Added fourth validation check to background task prerequisites (alongside login, remote environment, and git repo checks) in TT2() at line 427717
• New error type github_app_not_installed with user-friendly message and installation link at line 427972
• Evidence: KT2() at line 426828, TT2() at line 427717, Fb() at line 426624

Why it matters: Ensures background tasks have proper GitHub integration permissions before execution, preventing mysterious failures when app permissions are missing.