- Add Scan: returns all intermediate accumulator values
- Also known as prefix scan or cumulative fold
- Comprehensive tests including edge cases and different types
- Benchmark included
Example: Scan([]int{1,2,3,4}, 0, +) → [1, 3, 6, 10]
Resolves Issue 15
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Co-Authored-By: Claude <noreply@anthropic.com>
