reviewing-prs

Load before dispatching any subagent to review or triage a pull request, to pick the correct file version for the branch and worktree state. Required by: advanced-code-review (PR mode), code-review (--pr), distilling-prs (Phase 2), each of which names this skill at its dispatch point. Also use directly when: 'review PR #X', 'is it safe to read local files for this PR', 'why did the review say the bug is not there'.