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refactor-and-split
Refactor existing code without changing behavior — split oversized files, extract duplicates, simplify over-engineered patterns. Use when files exceed size thresholds, code is duplicated 4+ times, or has speculative abstractions, dead options, or wrapper indirection. Triggers "refactor", "split", "deduplicate", "simplify", "untangle", "clean up". Complements built-in `simplify` (which only reviews recent diffs).