Pair OSWEC variable-hydro yaw heading bank with MATLAB

[cmccomb]

Summary

• Add the published variable-hydro yaw case's nearest-heading selector to the Python WEC interface as yaw_heading_bank.
• Reuse the full-direction OSWEC HDF5 data for the source bank's heading-dependent excitation. The published bank generator copies the same rigid, hydrostatic, added-mass, and radiation data into each directional file.
• Generate and run the pinned MATLAB application's first 2° regular-wave case, then compare heading selection, yaw excitation on MATLAB's saved path, wave, body, and PTO histories.

Evidence and limits

• Local Python configuration and dynamics suite: 30 passed, one paired test skipped without MATLAB data.
• Fresh MATLAB source run completed all 60,001 samples. On its saved yaw path, the Python selector chose the same heading at every sample; yaw excitation differed by at most 867 N m. Before the first heading-event split at 64.57 s, independent yaw differed by at most 3.89e-5 rad, speed by 3.32e-5 rad/s, and PTO torque by 3.98 N m.
• The 2° selector is discontinuous. At 64.57 s a 3.7e-5 rad yaw difference selects opposite sides of a bank boundary for one sample. Subsequent switching offsets grow to a maximum 0.164 rad yaw difference over 600 s. Full trajectory parity remains unestablished; the test does not weaken or fit the solver to that trajectory.
• Paired run: https://github.com/cmudrc/wec-sim-python/actions/runs/37792909630

This change does not address general variable hydrodynamics, irregular-wave bank switching, or RM3 state-space Cases 5/6.