Return ordered item IDs from Move, Duplicate and Step and Repeat while preserving the existing moved and created counts, selection and undo behavior. Scripts can use the IDs to operate on copies.
Validation: eight independent probes covering both swatch validation and returned IDs, plus all six cargo xtask ci gates on main after #520 (1,188 native tests passed, 3 ignored; all 15 applicable crates passed WASM compilation checks). Both ROADMAP entries and command regression modules are retained.
Task: #521
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