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Add apl-take (dyadic ↑, multi-axis, cycling pad), apl-drop (dyadic ↓), apl-reverse (monadic ⌽), apl-rotate (dyadic ⌽, last axis), apl-reverse-first (monadic ⊖), apl-rotate-first (dyadic ⊖, first axis), apl-safe-mod helper for negative rotation arithmetic. 23 new tests in lib/apl/tests/structural.sx. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>