pr-brief

Interactive PR review. Pulls a PR via gh, groups files into features (markdown descriptions), computes a suggested review sequence, and launches a local HTML UI with GitHub-style stacked diffs, inline commenting (click-and-drag multi-line), realtime posting via gh, and two parallel AI narrative layers — purple ✨ "explain pills" that tell the story of the PR alongside the code, and red ⚠ "critique pills" with severity 1–5 that surface concerns and (optionally) suggested changes. Critique pills convert to inline GitHub comments on click. Triggers on: review this pr, brief pr, pr review ui, narrate pr, annotate pr, interactive pr review.