Agent Skills: pr-review-html

Pull a PR from GitHub, run parallel review agents (code reuse, quality, efficiency, spec adherence), apply local fixes, and write a self-contained HTML review page to the repo root. Use whenever the user wants to review a PR before merging or asks to "review PR <number>", "look at this PR", "give me an HTML review of PR X", or wants a browseable artifact for a GitHub pull request — even if they don't explicitly say "HTML".