fix(uv): tree --invert silently drops leaf cycles#3

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fix/tree-invert-leaf-cycles

Commits on Jul 8, 2026

fix(uv): tree --invert now handles leaf cycles without silently dropping the graph
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test: add invert_leaf_cycle integration test for tree --invert with leaf cycles
Beast-ofcourse
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fmt: collapse .child().write_str() chain in invert_leaf_cycle test
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