Converts a GitHub issue to a Markdown file.
issue2md <URL> [FILE]
URL— GitHub issue URL (e.g.https://github.com/microsoft/vscode/issues/60579)FILE— output file name (default:{repo}-{number}.md)
Tries GITHUB_TOKEN env var first, then falls back to gh auth token if the GitHub CLI is installed.
Writes a Markdown file containing the issue body and a chronological timeline of comments, labels, assignments, renames, milestones, and cross-references. Errors are printed to stderr.