[codex] Optimize sum root to leaf numbers#76
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Summary
Updates LeetCode 129 to carry the current root-to-leaf value through DFS instead of building string paths or reconstructing paths from parent pointers.
This makes the solution visit each node once and keeps auxiliary space proportional to tree height.
Validation
python3 practice/leetcode/solutions_00000/solution_00129.py805 passed in 1.29s10.00/10