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The duplicate step's cap check already reads the one constant after the merge; its tests filled 12 categories and now fill to the cap. An injected literal-12 check fails keeping_duplicates_separate_is_refused_at_the_category_cap. core.md section 9 gains the inventory of what degrades as categories grow. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze