Stateful transverse Stokes finite-volume reference with prescribed pressure/traction ports. Fixed thickness and matching exterior normal pressure; not a freely evolving edge.

Run once: python thin_film/scripts/stress_ports/run.py --prepare, then run.py.
Presentation: python thin_film/scripts/stress_ports/report.py.
Classical equations/ports are prior art; no native model change or C1 completion.
Sources reference.py/run.py plus PLAN.md frozen in protocol. Literature local copy reused by SHA256, not re-downloaded.