fix(mutation-ci): skip harness on zero-anchor diffs - #168
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…ct the diff (#166) A docs-only PR (#167) selected 0/77 mutations but still fell through to mutation_check.main(), running the full baseline suite — pure waste, and on the hosted runner the baseline happens to be RED, so an unrelated environment failure was pinned on the PR. Apply the same explicit-skip principle the empty-CHANGED-list branch already uses to an empty SELECTION: nothing to judge means no harness run, rc=0. The runner baseline-RED itself is tracked separately. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_013i2thbPR32hdh1y6cwzVF9
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PR #167에서 실측된 advisory mutation-pr 노이즈 수정: 교차 앵커 0건인 diff(문서 전용 PR 등)가 하네스 baseline(전체 스위트)으로 떨어져, 러너 환경의 무관한 baseline-RED가 PR에 뒤집어씌워졌다. 빈 CHANGED 목록의 명시적 스킵 원칙을 빈 SELECTION에도 적용 — 판정 대상 0건이면 하네스 무실행 rc=0.
러너 baseline-RED 자체(주간 잡도 동일 러너에서 fail-closed로 걸릴 환경 불일치)는 별도 이슈로 추적.
검증: test_mutation_scope_select(신규 MainEmptySelectionTest — 하네스 main 호출 시 AssertionError 나는 스파이) + test_mutation_workflow green, 라이브 스모크 rc=0.
🤖 Generated with Claude Code
https://claude.ai/code/session_013i2thbPR32hdh1y6cwzVF9