Review GitHub Pull Request

Summarize a GitHub pull request diff, highlighting key design decisions and notable code snippets.

Prerequisites

• The gh CLI must be authenticated (gh auth status)
• You must be in a git repository with a GitHub remote

Step 1: Resolve the PR

The user will provide either a PR number (e.g., #123 or 123) or a branch name. Determine which input was given and resolve it to a PR.

If a PR number is provided

Strip any leading # and use the numeric ID directly. Proceed to Step 2.

If a branch name is provided