Move jobs from gitdan-ci's ubuntu-latest to the desktop runner label, the default CI runner per daniel/gitdan#112, and fix comments and docs that named the old runner. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01MfBCVP2GbKqXSmmJXRPnXP