Adrian Kuta c45c5b7afa feat: stack-safe traversal + lazy Sequence + navigation/functional extensions ...

Core additive work for v3.4 (non-breaking):

- Rewrite nodeCount(), height(), clear() and the post-order iterator iteratively
  so deep/degenerate trees no longer throw StackOverflowError (verified to 50k deep).
- Add lazy Sequence traversal: asSequence(order), pre/post/levelOrderSequence().
- Add navigation extensions: isLeaf, degree, root(), ancestors(), siblings(),
  leaves(), descendants().
- Add functional extensions: findNode, filterNodes, anyNode, allNodes, countNodes,
  foldNodes, mapValues, deepCopy, structurallyEquals (all stack-safe).
- Add tests for stack-safety, the new APIs, and previously-uncovered
  height/depth/nodeCount/path (incl. exception paths). 40 tests green on JVM.

2026-06-06 13:35:39 +02:00

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