fix: enforce SCADA chart device coverage

contracts/view-command.schema.json

@@ -207,6 +207,97 @@
               "type": "string",
               "maxLength": 200
             },
+            "scada": {
+              "type": "object",
+              "properties": {
+                "role": {
+                  "type": "string",
+                  "enum": [
+                    "current",
+                    "comparison"
+                  ]
+                },
+                "metric": {
+                  "type": "string",
+                  "enum": [
+                    "pressure",
+                    "flow"
+                  ]
+                },
+                "unit": {
+                  "type": "string",
+                  "minLength": 1,
+                  "maxLength": 128
+                },
+                "window_start": {
+                  "type": "string",
+                  "maxLength": 64,
+                  "format": "date-time",
+                  "pattern": "^(?:[1-9][0-9]{3}|0[1-9][0-9]{2}|00[1-9][0-9]|000[1-9])-[0-9]{2}-[0-9]{2}T(?:[01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](?:\\.[0-9]+)?(?:Z|[+-](?:[01][0-9]|2[0-3]):[0-5][0-9])$"
+                },
+                "window_end": {
+                  "type": "string",
+                  "maxLength": 64,
+                  "format": "date-time",
+                  "pattern": "^(?:[1-9][0-9]{3}|0[1-9][0-9]{2}|00[1-9][0-9]|000[1-9])-[0-9]{2}-[0-9]{2}T(?:[01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](?:\\.[0-9]+)?(?:Z|[+-](?:[01][0-9]|2[0-3]):[0-5][0-9])$"
+                },
+                "value_field": {
+                  "type": "string",
+                  "enum": [
+                    "monitored_value",
+                    "cleaned_value"
+                  ]
+                },
+                "gaps": {
+                  "type": "array",
+                  "items": {
+                    "type": "object",
+                    "properties": {
+                      "device_id": {
+                        "type": "string",
+                        "minLength": 1,
+                        "maxLength": 128
+                      },
+                      "day_offset": {
+                        "type": "integer",
+                        "minimum": 0,
+                        "maximum": 7
+                      },
+                      "missing_count": {
+                        "type": "integer",
+                        "minimum": 1,
+                        "maximum": 100
+                      },
+                      "reason": {
+                        "type": "string",
+                        "enum": [
+                          "no_readings",
+                          "outside_frozen_scope",
+                          "outside_frozen_window",
+                          "no_scheduled_samples"
+                        ]
+                      }
+                    },
+                    "required": [
+                      "device_id",
+                      "day_offset",
+                      "missing_count",
+                      "reason"
+                    ],
+                    "additionalProperties": false
+                  },
+                  "maxItems": 8
+                }
+              },
+              "required": [
+                "role",
+                "metric",
+                "unit",
+                "window_start",
+                "window_end"
+              ],
+              "additionalProperties": false
+            },
             "chart_type": {
               "type": "string",
               "enum": [
@@ -241,6 +332,16 @@
                     "type": "string",
                     "maxLength": 128
                   },
+                  "device_id": {
+                    "type": "string",
+                    "minLength": 1,
+                    "maxLength": 128
+                  },
+                  "day_offset": {
+                    "type": "integer",
+                    "minimum": 0,
+                    "maximum": 7
+                  },
                   "type": {
                     "type": "string",
                     "enum": [