Enhanced GitHub Authentication Detection

What: GitHub CLI authentication detection now uses JSON output parsing for more reliable credential extraction.

How it works: The gh auth status command is now called with --active --json hosts flags, parsing structured JSON instead of text output. This improves reliability across different gh CLI versions and configurations.

Details:

• New function Xi5() at line 426046 uses gh auth status --active --json hosts for structured output
• Parses JSON response to extract hosts object and active account login
• Handles multiple GitHub hosts (github.com, Enterprise instances) by iterating through host entries
• Replaces old shell parsing approach that used sh -c "gh auth status 2>&1 | head -n 1" and regex matching
• Evidence: Xi5() at line 426046-426076

Why it matters: More robust GitHub authentication detection prevents false negatives and works consistently across different GitHub CLI versions and Enterprise configurations.