Create Draft Pull Request

Use the GitHub MCP server to create a draft pull request if available, otherwise use gh CLI.

1. Run the compile and hygiene tasks (fixing any errors)
2. If there are any uncommitted changes, use the /commit skill to commit them
3. Review all changes in the current session
4. Write a clear, concise PR title with a short area prefix (e.g. "sessions: …", "editor: …")
5. Write a description covering what changed, why, and anything reviewers should know
6. Create the draft pull request