ArenaPhysica/EMVal

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The port definition includes both its geometry and excitation convention. Every port in `design.json` uses the same schema, whether the reference conductor is the plane below the signal pin or one or more adjacent pads:

```json
{
  "name": "P1",
  "signal": {
    "position": {"x": 0.000899, "y": 0.001186},
    "layer": 0,
    "width_m": 0.00045
  },
  "grounds": [
    {
      "position": {"x": 0.000899, "y": 0.001186},
      "layer": 2,
      "width_m": 0.00045
    }
  ]
}
```

- A port is a lumped port between its `signal` pin and its `grounds` pins. The excitation is applied from the ground pin (or pins) to the signal pin. A pin is a point on a conductor and has a `position`, `layer`, and `width_m`.
- In v0, every port is a vertical launch: the ground pin sits on the ground plane directly beneath the signal pin, so the excitation spans the dielectric between layer 0 and layer 2. Coplanar ports (ground pads on the same layer beside the signal) use the same schema with `grounds` on the signal's layer.
- Reference impedance is 50 Ω (also an attribute on `sparams.h5`).
- One port is driven at a time, and each other port is terminated in the reference impedance. The driven-port index is the leading axis of each field array: `E[j]` is the electric field with port `j + 1` driven. For S-parameters, `S[i, j, f]` is the response at receiving port `i + 1` with port `j + 1` driven at frequency index `f`.
- Ports are numbered by their order in `ports`; `name` (`P1`, `P2`, ...) matches 

All datasets marked Use restrictions | JSON