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Materialize the removal sequence only when creating a destination archetype. Preserve PackedSet handling in all operation modes. Validation: 174 tests pass across 21 files; new regression cases also pass on main. Default benchs suite shows 17% faster component removal and 9-10% faster add/remove cycles on Nim 2.2.8 arm64.
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This PR tracks measured performance optimizations to vecs while preserving the external contract and public API.
The branch starts at main (1baee43); runtime code is unchanged at PR creation. Each optimization will be measured with benchs/vecs_bench.nim and committed separately, with frequent pushes.
Baseline validation: all 20 files under tests compile and run on Nim 2.2.8, including manycomponents with -d:ArchetypeWords=2; 170 test cases pass. Benchmark results and final validation will be added as optimizations are completed.