V151 MAX HEIGHT ACTUAL OCEAN

Base: v150_station_cell_only.

Changes:
- Keep station/JESIM observations as 1 m shoreline-equivalent gauges.
- Keep ocean max-height display values as actual grid-cell water height.
- Change the ocean max-height/arrival propagation layer to use actual grid-cell height for the 5 cm arrival threshold instead of converting ocean cells to the 1 m shoreline-equivalent basis.
- Update UI text/comments from coastal-equivalent arrival to actual-ocean arrival.

Unchanged:
- Station cell-only sampling.
- M0 x2 calibration from v148.
- Row/col swap from v149.
- 6h global decay keep=0.775.
- Output shoaling disabled for display/max wave.
- Station shoreline-equivalent shoaling enabled.
