Kernel rig: construction cases, the centre of a circular edge, sphere, torus and sketch arc, and a flat face refused

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

tests/kernel-cases/construction/cov-point-center-of-a-circular-edge/expected.json

@@ -0,0 +1,15 @@
+{
+ "sources": [],
+ "what": "the centre of a cylinder's top edge",
+ "source": "analytic",
+ "method": "cylinder r 5, h 10 on (60,0,0) along +Z: its top edge is the circle about (60,0,10)",
+ "construction": {
+  "C": {
+   "point": [
+    60,
+    0,
+    10
+   ]
+  }
+ }
+}

tests/kernel-cases/construction/cov-point-center-of-a-circular-edge/recipe.json

@@ -0,0 +1,31 @@
+{
+ "commands": [
+  {
+   "command": "solid.cylinder",
+   "params": {
+    "base": [
+     60,
+     0,
+     0
+    ],
+    "radius": 5,
+    "height": 10,
+    "body_name": "Cyl",
+    "operation": "new"
+   }
+  },
+  {
+   "command": "construct.point.center",
+   "params": {
+    "of": {
+     "edge": [
+      65,
+      0,
+      10
+     ]
+    },
+    "name": "C"
+   }
+  }
+ ]
+}

tests/kernel-cases/construction/cov-point-center-of-a-sketch-arc/expected.json

@@ -0,0 +1,15 @@
+{
+ "sources": [],
+ "what": "the centre of a sketch arc",
+ "source": "analytic",
+ "method": "the arc r 10 about the sketch origin on XY",
+ "construction": {
+  "C": {
+   "point": [
+    0,
+    0,
+    0
+   ]
+  }
+ }
+}

tests/kernel-cases/construction/cov-point-center-of-a-sketch-arc/recipe.json

@@ -0,0 +1,42 @@
+{
+ "commands": [
+  {
+   "command": "sketch.create",
+   "params": {
+    "plane": "XY",
+    "name": "Path"
+   }
+  },
+  {
+   "command": "sketch.arc.center_point",
+   "params": {
+    "center": [
+     0,
+     0
+    ],
+    "start": [
+     10,
+     0
+    ],
+    "end": [
+     0,
+     10
+    ]
+   }
+  },
+  {
+   "command": "sketch.finish",
+   "params": {}
+  },
+  {
+   "command": "construct.point.center",
+   "params": {
+    "of": {
+     "sketch": "Path",
+     "curve": "a1"
+    },
+    "name": "C"
+   }
+  }
+ ]
+}

tests/kernel-cases/construction/cov-point-center-of-a-sphere/expected.json

@@ -0,0 +1,15 @@
+{
+ "sources": [],
+ "what": "the centre of a sphere",
+ "source": "analytic",
+ "method": "sphere r 5 on (0,0,60)",
+ "construction": {
+  "C": {
+   "point": [
+    0,
+    0,
+    60
+   ]
+  }
+ }
+}

tests/kernel-cases/construction/cov-point-center-of-a-sphere/recipe.json

@@ -0,0 +1,30 @@
+{
+ "commands": [
+  {
+   "command": "solid.sphere",
+   "params": {
+    "center": [
+     0,
+     0,
+     60
+    ],
+    "radius": 5,
+    "body_name": "Ball",
+    "operation": "new"
+   }
+  },
+  {
+   "command": "construct.point.center",
+   "params": {
+    "of": {
+     "face": [
+      5,
+      0,
+      60
+     ]
+    },
+    "name": "C"
+   }
+  }
+ ]
+}

tests/kernel-cases/construction/cov-point-center-of-a-torus/expected.json

@@ -0,0 +1,15 @@
+{
+ "sources": [],
+ "what": "the centre of a torus",
+ "source": "analytic",
+ "method": "torus major 10, minor 2 on (0,60,0)",
+ "construction": {
+  "C": {
+   "point": [
+    0,
+    60,
+    0
+   ]
+  }
+ }
+}

tests/kernel-cases/construction/cov-point-center-of-a-torus/recipe.json

@@ -0,0 +1,31 @@
+{
+ "commands": [
+  {
+   "command": "solid.torus",
+   "params": {
+    "center": [
+     0,
+     60,
+     0
+    ],
+    "major": 10,
+    "minor": 2,
+    "body_name": "Ring",
+    "operation": "new"
+   }
+  },
+  {
+   "command": "construct.point.center",
+   "params": {
+    "of": {
+     "face": [
+      12,
+      60,
+      0
+     ]
+    },
+    "name": "C"
+   }
+  }
+ ]
+}

tests/kernel-cases/construction/cov-point-center-refuses-a-flat-face/expected.json

@@ -0,0 +1,8 @@
+{
+ "sources": [],
+ "what": "the centre of a flat face",
+ "source": "analytic",
+ "method": "box 40 x 30 x 20 with a corner at the origin (x 0..40, y 0..30, z 0..20): the top is a plane, not a sphere or torus: refused",
+ "outcome": "refused",
+ "refusal": "the face is not a sphere or torus"
+}

tests/kernel-cases/construction/cov-point-center-refuses-a-flat-face/recipe.json

@@ -0,0 +1,26 @@
+{
+ "commands": [
+  {
+   "command": "solid.box",
+   "params": {
+    "length": 40,
+    "width": 30,
+    "height": 20,
+    "body_name": "Box"
+   }
+  },
+  {
+   "command": "construct.point.center",
+   "params": {
+    "of": {
+     "face": [
+      20,
+      15,
+      20
+     ]
+    },
+    "name": "C"
+   }
+  }
+ ]
+}