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Both from the adversarial review of PR #78. The first is the sharpest finding of the campaign: improvise-mcq4's narrowing had already been measured as buying nothing (12.41ms to 12.56ms) and was kept only as 'the honest shape' — and it turned out to cost a multi-client invalidation no test named. A change with no measured benefit carried an unmeasured cost. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FC2jVn8Au7E9JPkw6bwXXH