review-pr-stacklisted

# Review a stack / sequence of PRs Read the [shared review contract](../../contracts/review-contract.md) before executing this workflow. Its evidence, candidate ledger, execution and verdict rules apply throughout. Stacked PRs each build on the one below. The golden rule: **review each PR against its own base**, so you only see what that layer introduces — not the whole tower. ## Stage 0 — Scale & cost Per-PR fan-out (swarm + verifier) has no ceiling. Count the PRs first. **Above ~20 PRs**, surface the cost and offer: - (a) group by theme and review a representative PR per group, - (b) sample the highest-risk PRs (large diffs; auth / money / data-migration paths), - (c) run an explicitly requested multi-round audit using available host capabilities for an exhaustive run — only on explicit "use a workflow". Never silently fan a swarm over hundreds of PRs — a ~200-PR stack is millions of tokens. ## Stage 1 — Establish the order Get the explicit list from the user, or enumerate: ```bash gh pr list --state open --json number,title,baseRefName,headRefName --limit 50 ``` Build the chain by linking each PR's `baseRefName` to the `headRefName` below it (bottom PR's base is the trunk, e.g. `main`/`dev`). If the project uses the `gh-stack` extension or Graphite/Sapling, use it to read the stack. Confirm the order with the user before diving in if it's not obvious. ## Stage 2 — Review each layer (bottom → top) For each PR in order, run the **`review-pr`** pipeline, but scope the