github-project-setup-py-add-milestone-close-command

name	github_project_setup.py: add `milestone close` command
description	`github_project_setup.py` now has `milestone start` which bulk-transitions `status:needs-grooming` → `status:in-progress`. Add a symmetric `milestone close` command for the `complete-milestone` skill. The command should: (1) validate the milestone is open, (2) list all still-open issues (warn if any remain), (3) transition open issues from `status:in-progress` → `status:done` or close them, (4) close the milestone itself via `milestone.edit(state='closed')`, (5) print a completion summary. Updat
metadata	{"topic":"githubprojectsetuppy-add-milestone-close-command","source":"PR #149 follow-up — start-milestone automation (2026-02-22)","added":"2026-02-22","priority":"P2","type":"Feature","status":"done"}

Suggested location: .claude/skills/gh/scripts/github_project_setup.py — add milestone close subcommand under milestone_app; update .claude/skills/complete-milestone/SKILL.md