Gate OWC orifice physical prefix in Python CI

[cmccomb]

What changed

• Archive the exact pinned seven-DOF OWC OrificeModel HDF5 and a compact 0–6 s R2025b source prefix, with source run and SHA-256 provenance.
• Keep the public physical coupled OWC run in ordinary Python CI. The solve receives only hydrodynamic data and saved wave phases; the MATLAB body and flexible-mode histories are checked afterward against the previously declared 6 s motion limits.
• Gate the standalone orifice law at five saved internal solver evaluations spanning both flow signs and subthreshold/superthreshold Mach flags.
• Update the measured combined line-and-branch coverage badge from 76% to 77%. Case badges stay unchanged because the 130 s physical coupled trajectory remains unpaired.

Verification

• Focused portable tests: 2 passed.
• Full local Python suite: 257 passed, 333 MATLAB-dependent tests skipped; combined coverage 77%.
• The original pinned artifact's standalone orifice-law test passed. Its broader wave test passed the wave/excitation assertions, then stopped on a force CSV produced by a separate diagnostic artifact; the portable test uses only files present in the pinned baseline artifact.

The early motion gates are unchanged: surge 12 mm, heave 25 mm, pitch 10 mrad, flexible displacement 7.5 mm. No MATLAB job or numerical limit was relaxed.