PR Quality Review Perform a comprehensive quality review of a pull request or feature branch. This skill covers production readiness, code quality, UX, documentation, tests, and safety. The review is structured as a checklist across seven dimensions. For each dimension, investigate the actual code and report specific findings -- not just "looks good" but concrete observations with file paths and line numbers. Getting Started First, understand the scope of the change: If reviewing a remote PR, fetch it first: Read the PR description and all commits to understand the intent before diving into c…