PR Sweep — batch-review + dedup-close + gated auto-merge

Repo profile — read .claude/repo-profile.md first. This skill is repo-agnostic; arc is the reference implementation. Use the profile's values wherever this doc shows an arc default: repo_slug (the gh -R target), gate_mode (arc = scripts: no CI on PRs, so gh pr checks is empty and pre-merge is the only gate; ci/both repos ALSO require gh pr checks green), verification_entry / pre_merge_entry. Arc's own provenance for the lessons below is not inlined here (fuller case narratives, where they exist, are under .claude/case-law/).

A batch driver over pr-review. pr-review handles ONE PR (read → verify against code → run verification gate → detect conflicts → verdict). pr-sweep runs that engine across all open PRs, then does the two things a single-PR engine can't: resolve cross-PR duplicate/conflict clusters (keep one, comment + close the rest) and gated auto-merge the clean ones.

This is the thing a cron schedules: one run = sync + review-all + dedup-close + (optionally) merge. It is the PR-world twin of issue-sweep; together they let an independent machine keep both issues and PRs moving with no human in the loop — escalating only the genuinely human-only decisions.