alonso.torres 0d255f3f40 🐛 Keep nested copies in a detached parent's orientation during sync
Express the source subtree in its ordinary parent's orientation before
syncing a surviving nested copy. Detaching a rotated outer instance no
longer makes a later main edit turn the nested copy back. Fix F131.

The focused regression failed on points and rotation before the fix.
Geometry/reset suites: 19 tests, 111 assertions, all green.
Benchmark ratios against Phase 1e: main 10/100/1000 0.46/0.52/0.53;
three levels 0.47; chain 0.51; library 0.51; many shapes 0.49;
variant switch 0.61. No regression flag.

AI-assisted-by: GPT-6
2026-10-30 09:50:08 +01:00
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