The runner-beside-the-lenses design is now what Done-when box 1 asks for (body amended). A rubric round whose runner and worktree fallback both fail returns an error before the push instead of landing a PR whose body claims a substitute reviewed it. The harness records lens count at the runner's start too (expects 0, so a re-serialised runner reddens), resets its counter per round, and has a case for the double failure. Decisions-Edit: yes Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015QqCpYFsKgnAnx6jVwrKiV