feat: Unify handling of EME coefficients (FXC-4311)

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 - Added `warn_once` option to logging configuration (`td.config.logging.warn_once`) that causes each unique warning message to be shown only once per process, reducing noise from repeated validation warnings.
+- `EMECoefficientMonitor` now supports all of the same fields as `EMESimulationData.coeffs`, with the benefit of downsampling. The fields can be selected via the `EMECoefficientMonitor.fields` property.
 
 ### Changed
 - Unified inside/outside permittivity handling for all geometries when computing shape gradients.

schemas/EMESimulation.json

@@ -4666,6 +4666,24 @@
           "exclusiveMinimum": 0,
           "type": "integer"
         },
+        "fields": {
+          "default": [
+            "A",
+            "B"
+          ],
+          "items": {
+            "enum": [
+              "A",
+              "B",
+              "flux",
+              "interface_smatrices",
+              "n_complex",
+              "overlaps"
+            ],
+            "type": "string"
+          },
+          "type": "array"
+        },
         "freqs": {
           "anyOf": [
             {