Kernel rig: inspect cases, three isocurves each way on a cube's top, and a count of 0 refused

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/kernel-cases/inspect/cov-isocurve-cube-top/expected.json

@@ -0,0 +1,28 @@
+{
+ "sources": [],
+ "what": "three isocurves each way across a cube's top",
+ "source": "analytic",
+ "method": "cube 40 with a corner at the origin: its top is the plane z = 40, 0..40 each way; 3 curves each way, evenly spaced, are x = 10, 20, 30 and y = 10, 20, 30: 3 u-curves and 3 v-curves",
+ "results": [
+  {
+   "command": 1,
+   "pointer": "/faces/0/body",
+   "value": "Cube"
+  },
+  {
+   "command": 1,
+   "pointer": "/faces/0/count",
+   "value": 3
+  },
+  {
+   "command": 1,
+   "pointer": "/faces/0/u_curves",
+   "value": 3
+  },
+  {
+   "command": 1,
+   "pointer": "/faces/0/v_curves",
+   "value": 3
+  }
+ ]
+}

tests/kernel-cases/inspect/cov-isocurve-cube-top/recipe.json

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+{
+ "commands": [
+  {
+   "command": "solid.box",
+   "params": {
+    "length": 40,
+    "width": 40,
+    "height": 40,
+    "body_name": "Cube",
+    "operation": "new"
+   }
+  },
+  {
+   "command": "inspect.isocurve",
+   "params": {
+    "faces": [
+     [
+      20,
+      15,
+      40
+     ]
+    ],
+    "count": 3
+   }
+  }
+ ]
+}

tests/kernel-cases/inspect/cov-isocurve-refuses-zero-curves/expected.json

@@ -0,0 +1,8 @@
+{
+ "sources": [],
+ "what": "isocurves with a count of 0",
+ "source": "analytic",
+ "method": "box 40 x 30 x 20 with a corner at the origin: a count is a whole number 1 to 100: 0 is refused",
+ "outcome": "refused",
+ "refusal": "`count` must be a whole number of curves each way"
+}

tests/kernel-cases/inspect/cov-isocurve-refuses-zero-curves/recipe.json

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+{
+ "commands": [
+  {
+   "command": "solid.box",
+   "params": {
+    "length": 40,
+    "width": 30,
+    "height": 20,
+    "body_name": "Box",
+    "operation": "new"
+   }
+  },
+  {
+   "command": "inspect.isocurve",
+   "params": {
+    "faces": [
+     [
+      20,
+      15,
+      20
+     ]
+    ],
+    "count": 0
+   }
+  }
+ ]
+}