Add FireWx-FM input channel contract

models/wildfire_fm/input_channels.json

@@ -0,0 +1,113 @@
+{
+  "tensor_order": "[channel, y, x]",
+  "channel_order_matters": true,
+  "grid": {
+    "region": "California",
+    "crs": "EPSG:5070",
+    "resolution_m": 5000,
+    "target_lead_hours": 12
+  },
+  "notes": [
+    "FIRMS active-fire detections are used to derive the occupancy target, not as an input channel.",
+    "WFIGS and MTBS are supporting event-level resources and are not part of the pretrained occupancy input.",
+    "The regional cache contains zero firewx feature channels and one firewx_valid channel, so the released input has 16 channels total."
+  ],
+  "channels": [
+    {
+      "index": 0,
+      "name": "t2m",
+      "source": "NOAA HRRR",
+      "role": "2 m temperature"
+    },
+    {
+      "index": 1,
+      "name": "d2m",
+      "source": "NOAA HRRR",
+      "role": "2 m dew point"
+    },
+    {
+      "index": 2,
+      "name": "u10",
+      "source": "NOAA HRRR",
+      "role": "10 m east-west wind component"
+    },
+    {
+      "index": 3,
+      "name": "v10",
+      "source": "NOAA HRRR",
+      "role": "10 m north-south wind component"
+    },
+    {
+      "index": 4,
+      "name": "cape",
+      "source": "NOAA HRRR",
+      "role": "convective available potential energy"
+    },
+    {
+      "index": 5,
+      "name": "sp",
+      "source": "NOAA HRRR",
+      "role": "surface pressure"
+    },
+    {
+      "index": 6,
+      "name": "blh",
+      "source": "NOAA HRRR",
+      "role": "boundary-layer height"
+    },
+    {
+      "index": 7,
+      "name": "vis",
+      "source": "NOAA HRRR",
+      "role": "visibility"
+    },
+    {
+      "index": 8,
+      "name": "prate",
+      "source": "NOAA HRRR",
+      "role": "precipitation rate"
+    },
+    {
+      "index": 9,
+      "name": "tp",
+      "source": "NOAA HRRR",
+      "role": "accumulated precipitation"
+    },
+    {
+      "index": 10,
+      "name": "firewx_valid",
+      "source": "cache validity channel",
+      "role": "dynamic/input validity mask for this regional cache"
+    },
+    {
+      "index": 11,
+      "name": "static_valid",
+      "source": "static reprojection mask",
+      "role": "fraction of static layers valid at the grid cell"
+    },
+    {
+      "index": 12,
+      "name": "fuel_fbfm40",
+      "source": "LANDFIRE FBFM40",
+      "role": "fire-behavior fuel model"
+    },
+    {
+      "index": 13,
+      "name": "canopy_cover",
+      "source": "LANDFIRE CC",
+      "role": "canopy cover"
+    },
+    {
+      "index": 14,
+      "name": "housing_density",
+      "source": "Wildfire Risk to Communities",
+      "role": "housing-unit density"
+    },
+    {
+      "index": 15,
+      "name": "population",
+      "source": "LandScan Global 2024",
+      "role": "population exposure"
+    }
+  ]
+}