BehaviorTree / BehaviorTree.CPP / 21670802159

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Add exception tracking with node backtrace (fixes #990) (#1106)

When an exception is thrown during tick(), it is now wrapped in a
NodeExecutionError that includes:
- The failing node's name, path, and registration name
- Full tick backtrace from root to the failing node
- Original exception message

This helps users debug which node caused an exception during tree
execution, addressing the feature request in issue #990.

Example output:
  Exception in node '/MainTree/Seq/MyAction': Connection timeout
  Tick backtrace:
     /MainTree (RootNode)
     /MainTree/Seq (Sequence)
  -> /MainTree/Seq/MyAction (MyCustomAction)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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