Add /merge-green-prs skill

[robdevops]

Summary

Adds a project skill, /merge-green-prs, that checks the repo's open pull requests and merges the ones from claude/* branches whose tests have passed.

What it does

• Lists open PRs and reads each one fresh from GitHub through the GitHub MCP tools (no gh).
• Merges a PR only if it is open, not a draft, from a claude/* branch in this same repo, based on the default branch, mergeable_state is clean, every check run is completed and successful, and there is no requested change or unresolved review thread.
• Merges with a merge commit pinned to the head SHA it just read, reads the PR back to confirm, and prints a table of outcomes (merged / waiting / red / blocked / skipped).
• Never merges other branches or forks, never re-runs or skips tests, never force-pushes, approves, closes or deletes anything.

Files

• .claude/skills/merge-green-prs/SKILL.md (new)
• CLAUDE.md: one line in the Commands section pointing at the skill

Test plan

• make check on Python 3.13.5 (ruff + pytest): 211 passed
• Dry run of the read-only steps against the real repo: no open PRs, and every GitHub tool the skill names returned data
• CI check job on this PR
• The merge step has not been exercised; the next green claude/* PR will be its first real use

🤖 Generated with Claude Code

https://claude.ai/code/session_014k4kywyN5dAo39izUPvxbw

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Generated by Claude Code