Read-only reflection of GitHub Milestones onto the Hollahoop roadmap surface - explicitly NOT a new Hollahoop primitive. For each linked repo, fetch open milestones; render them as soft headings on the roadmap with their due_on date and progress (open/closed issue count from GitHub). Posts whose linked issue belongs to a milestone get a small "Milestone: v1.4" badge.

This is the use-GitHub-as-the-planning-layer play. Keeps Hollahoop free of epic/story/sprint vocabulary while looking like a planning tool to anyone who wants one. Refresh on milestone webhook events plus a 5-minute cache fallback.