LeetCode 72: Edit Distance

## [LeetCode 72: Edit Distance](https://leetcode.com/problems/edit-distance/)

**Difficulty:** Medium
**Category:** DP - Multidimensional

### Tasks
- [ ] Implement solution in `src/dp_multidimensional/edit_distance.py`
- [ ] Verify tests pass: `pytest tests/test_edit_distance.py`
- [ ] Analyze time and space complexity