Execute End-to-End Proof of Op

[Nomad-01]

Gauntlet for Each station:

1. Pre-test inspection
2. Sensor Snapshot
3. Controlled water draw
4. Valve operation verification
5. Heater response observation
6. Power-data collection
7. Run artifact view
8. Test-result record and pretty graphs/plots

Done when:

Repository contains a reproducible test record, not just terminal output