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Release R2.2.0 (#114)

* Preparing for 2.1.2.

- Updated the version to 2.1.2pre
- Linked the Github repository in the metadata (for Github packages)

* Updated the Rakefile to publish packages to the Github registry.

Registry: <https://github.com/evolve75/RubyTree/pkgs/rubygems/rubytree>

* Prevent adding ancestor as child

* Detach children on remove_all!

Ensure children become true roots after remove_all! by clearing their parent
links. This matches the method's contract and prevents stale parent
references from corrupting later traversal or metrics.

* Guard rename_child collisions

Raise when renaming a child to an existing sibling name to prevent overwriting
entries in the children hash. This avoids orphaning nodes and keeps child
lookup consistent.

* Harden binary child assignment

Fix set_child_at index errors and clean up parent/hash references
when replacing or clearing children. This preserves swap semantics and
avoids stale lookups.

* Handle nils in traversal

Skip nil children during postorder and breadth-first traversals so binary
nodes with missing children do not break traversal. Add a regression test
covering nil child traversal paths.

* Fix each_level enumerator

Return a level-wise enumerator when no block is given and add a test to
assert the yielded level arrays match the tree structure.

* Fix to_s empty content

Render '<Empty>' when a node has nil content and add tests for both
nil and non-nil content values.

* Document 2.2.0 API changes

Add a new 2.2.0 section covering recent behavior changes in tree
operations and traversal, plus link references for the new entries.

* Release 2.2.0

Bump the gem version to 2.2.0 and record the 2.2.0 changes in the
project history.

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