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Step 2 asks "Would the tests catch a regression if the code changed?" but gives no way to answer it. Reading the tests answers it badly: a check tested in only one direction looks covered. Inverting one condition of the change and running the suite answers it in one run, and a surviving mutation names the missing test case. Assisted-by: claude-code:claude-opus-5-5 Agent-Session: https://claude.ai/code/session_01282cSgXhjM3B6sZA1ZRCSF Agent-Host: 0493f0 Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>