Ghp:wrap Milestone

/ghp:wrap-milestone — Close Out a Milestone

Flow

1. Identify the milestone. If not specified, infer from the current branch name: m7-new-eval-strategy → milestone #7 (Milestone 7 - ...). Or ask the user.

2. Check all issues. List issues in the milestone with gh issue list --milestone "Milestone 7 - Name" --state all. Verify all are closed or in Review status. If any are still In Progress or earlier, show them and ask whether to proceed or stop.

3. Check blocking relationships. For any still-open issues, run gh issue-ext blocking list to understand why they're open.

4. Create the PR from the milestone branch to main. The PR body must include closes #N for every completed issue under the milestone:

   gh pr create --base main \
     --title "feat: Milestone 7 - Name" \
     --body "## Summary
   <what this milestone achieved>
   
   ## Issues closed
   closes #42
   closes #43
   closes #44
   closes #45
   
   ## Milestone
   Closes milestone: Milestone 7 - Name"
   

5. After PR is merged, close the milestone:

   gh milestone edit <number> --state closed
   

6. Clean up branches. Ask the user via AskUserQuestion what to do with the milestone branch:

   Option	Action
   Keep	Leave the branch as-is
   Delete local only	git branch -d <branch>
   Delete remote only	git push origin --delete <branch>
   Delete both	Delete local and remote

   Also check for any remaining issue/sub-issue branches under this milestone (m{N}/...) and ask about each one separately.

7. Notify the user with the PR URL, list of closed issues, and confirmation that the milestone is closed.