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New flow_length_mfd() computes proportion-weighted flow path lengths from MFD fraction grids. Downstream mode gives the expected distance to outlet weighted by MFD fractions; upstream mode gives the longest path from any divide to each cell. All four backends: NumPy, CuPy, Dask+NumPy, Dask+CuPy. 29 tests covering correctness, edge cases, and cross-backend consistency.
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Summary
flow_length_mfd()function: proportion-weighted flow path lengths from MFD fraction gridsThe MFD pipeline had direction, accumulation, stream ordering, and stream links but no flow length. Now it does.
Closes #1009
Test plan