Add github-cli skill for gh CLI operations

skill/github-cli/SKILL.md

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+---
+name: github-cli
+description: >
+  Interact with GitHub using the gh CLI - PRs, issues, repos, releases, and actions.
+  Trigger terms: github, gh, pull request, PR, issue, release, actions, workflow, repo.
+---
+
+## When to Use
+- Creating, viewing, or merging pull requests
+- Managing issues (create, close, comment)
+- Checking workflow/action status
+- Creating releases
+- Cloning or forking repos
+
+## When NOT to Use
+- Local git operations (use `git` directly)
+- Non-GitHub remotes (GitLab, Bitbucket)
+
+## Prerequisites
+- `gh` CLI installed
+- SSH key `~/.ssh/agent` configured for GitHub access
+- Set `GIT_SSH_COMMAND` if needed: `export GIT_SSH_COMMAND="ssh -i ~/.ssh/agent"`
+
+## Quick Reference
+
+### Pull Requests
+| Action | Command |
+|--------|---------|
+| List PRs | `gh pr list` |
+| View PR | `gh pr view <number>` |
+| Create PR | `gh pr create --title "..." --body "..."` |
+| Checkout PR | `gh pr checkout <number>` |
+| Merge PR | `gh pr merge <number>` |
+| PR diff | `gh pr diff <number>` |
+| PR checks | `gh pr checks <number>` |
+
+### Issues
+| Action | Command |
+|--------|---------|
+| List issues | `gh issue list` |
+| View issue | `gh issue view <number>` |
+| Create issue | `gh issue create --title "..." --body "..."` |
+| Close issue | `gh issue close <number>` |
+| Comment | `gh issue comment <number> --body "..."` |
+
+### Repos & Releases
+| Action | Command |
+|--------|---------|
+| Clone | `gh repo clone <owner>/<repo>` |
+| Fork | `gh repo fork <owner>/<repo>` |
+| View repo | `gh repo view` |
+| Create release | `gh release create <tag> --title "..." --notes "..."` |
+| List releases | `gh release list` |
+
+### Actions & Workflows
+| Action | Command |
+|--------|---------|
+| List runs | `gh run list` |
+| View run | `gh run view <run-id>` |
+| Watch run | `gh run watch <run-id>` |
+| Rerun failed | `gh run rerun <run-id> --failed` |
+| List workflows | `gh workflow list` |
+
+### API Access
+```bash
+gh api repos/<owner>/<repo>/pulls
+gh api graphql -f query='...'
+```
+
+## Procedure
+
+1. Ensure `gh auth status` shows authenticated
+2. Use `gh pr list` or `gh issue list` to find items
+3. Perform action with appropriate command
+4. Verify with `gh pr checks` or `gh run list`
+
+## Checks & Guardrails
+- Always check PR status before merging
+- Use `--draft` for work-in-progress PRs
+- Prefer `gh pr merge --squash` for clean history
+- Check `gh run list` after pushing to verify CI