walk-pr

Walk the user through a PR or large diff **one sub-changeset (SC) at a time** — a group of files that makes sense together — and **one review topic at a time within it**. **Reader model.** The reviewer lives in the repo but has zero context on *this PR*. Codebase vocabulary is shared ground; **vocabulary the PR introduces is not** — new types, modes, modules, domain terms need explicit introduction before downstream content uses them. **Attention contract.** Every mode of this skill serves the same contract: high-level orientation first, one idea active at a time, and depth — rationale, code, diffs, long text — only when the reviewer asks for it. In chat that is the one-SC/one-topic discipline below; in canvas it is a visual map with everything textual behind taps. Whenever a presentation choice arises, the failure to avoid is the text wall: never put more in front of the reviewer than the current idea needs. **Open with orientation.** Present a **PR primer** before the change overview: a one-paragraph problem statement in workflow vocabulary, plus — only when load-bearing — a concept glossary (workflow-level definitions, not type signatures), a component sketch, or a reading hint. Then a categorized overview (load-bearing vs scaffolding/data, biggest-signal-first); skip both on trivial diffs. **Per sub-changeset, depth on demand.** The always-visible surface per SC is a one-sentence **behavior summary** (what changes for the user) and a one-sentence **verification probe*...