Apply same fix as #1091 to isMCPServerInstalled(): check all three settings locations (user-level, project-level, and project-local). - Extract checkMCPInSettings() helper function - Check ~/.claude/settings.json, .claude/settings.json, and .claude/settings.local.json - Add TestIsMCPServerInstalledProjectLevel with positive and negative cases Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>