alonso.torres 980c71b645 🐛 Keep inherited placement untouched during a plain swap
Compare retained orientation with the position source in copy-parent
coordinates, including cached deleted mains. A rotation inherited from
that source does not author a geometry override (F154).

The focused regression fails before the change. Swap and variant suites
pass 100 tests and 510 assertions; common lint and format pass. Benchmark
ratios: mains 0.47/0.53/0.55; levels 0.51; chain 0.64; library 0.64;
many shapes 0.96; switch 0.68, with no regression flags.

AI-assisted-by: GPT-6
2026-10-28 15:53:09 +01:00
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