Kernel rig: align cases, face onto face as a move, a side face turned onto a top face, and a face onto an offset plane along its normal

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

tests/kernel-cases/solids/cov-align-bottom-face-onto-top-face/expected.json

@@ -0,0 +1,25 @@
+{
+ "sources": [],
+ "what": "a cube's bottom face aligned onto a plate's top face (normals already opposite: a pure move)",
+ "source": "analytic",
+ "method": "the faces' normals are -Z and +Z: no turn; the picked point (105,5,0) goes to (20,20,10): the cube moves by (-85,15,10) to x 15..25, y 15..25, z 10..20. COM z = (16000*5 + 1000*15)/17000",
+ "body_count": 2,
+ "volume_mm3": 17000.0,
+ "center_of_mass": [
+  20,
+  20,
+  5.588235294117647
+ ],
+ "bbox": {
+  "min": [
+   0,
+   0,
+   0
+  ],
+  "max": [
+   40,
+   40,
+   20
+  ]
+ }
+}

tests/kernel-cases/solids/cov-align-bottom-face-onto-top-face/recipe.json

@@ -0,0 +1,45 @@
+{
+ "commands": [
+  {
+   "command": "solid.box",
+   "params": {
+    "length": 40,
+    "width": 40,
+    "height": 10,
+    "body_name": "Base"
+   }
+  },
+  {
+   "command": "solid.box",
+   "params": {
+    "length": 10,
+    "width": 10,
+    "height": 10,
+    "corner": [
+     100,
+     0,
+     0
+    ],
+    "body_name": "Block"
+   }
+  },
+  {
+   "command": "solid.align",
+   "params": {
+    "bodies": [
+     "Block"
+    ],
+    "from_face": [
+     105,
+     5,
+     0
+    ],
+    "to_face": [
+     20,
+     20,
+     10
+    ]
+   }
+  }
+ ]
+}

tests/kernel-cases/solids/cov-align-face-onto-offset-plane/expected.json

@@ -0,0 +1,20 @@
+{
+ "sources": [],
+ "what": "a post's bottom face aligned onto a plane z=50 away from the picked point in X and Y: it moves along the plane's normal only",
+ "source": "analytic",
+ "method": "onto a plane the point moves along its normal: (0,0,50); the bottom faces -Z, the plane +Z: no turn. The post goes to z 50..70, x and y unchanged",
+ "body_count": 1,
+ "volume_mm3": 2000.0,
+ "bbox": {
+  "min": [
+   100,
+   0,
+   50
+  ],
+  "max": [
+   110,
+   10,
+   70
+  ]
+ }
+}

tests/kernel-cases/solids/cov-align-face-onto-offset-plane/recipe.json

@@ -0,0 +1,43 @@
+{
+ "commands": [
+  {
+   "command": "solid.box",
+   "params": {
+    "length": 10,
+    "width": 10,
+    "height": 20,
+    "corner": [
+     100,
+     0,
+     0
+    ],
+    "body_name": "Post"
+   }
+  },
+  {
+   "command": "solid.align",
+   "params": {
+    "bodies": [
+     "Post"
+    ],
+    "from_face": [
+     105,
+     5,
+     0
+    ],
+    "to_plane": {
+     "origin": [
+      0,
+      0,
+      50
+     ],
+     "normal": [
+      0,
+      0,
+      1
+     ]
+    }
+   }
+  }
+ ]
+}

tests/kernel-cases/solids/cov-align-side-face-turns-onto-top-face/expected.json

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+{
+ "sources": [],
+ "what": "a 10x10x20 post's side face (+X) aligned onto a plate's top face: the post turns 90 deg to lie flat",
+ "source": "analytic",
+ "method": "+X turns onto -Z: 90 deg about +Y through (110,5,10), the post becomes 20 along X, 10 along Z (x 100..120, z 10..20); the point then moves to (20,20,10): x 10..30, y 15..25, z 10..20. Unturned it would reach z 30. COM z = (16000*5 + 2000*15)/18000",
+ "body_count": 2,
+ "volume_mm3": 18000.0,
+ "center_of_mass": [
+  20,
+  20,
+  6.111111111111111
+ ],
+ "bbox": {
+  "min": [
+   0,
+   0,
+   0
+  ],
+  "max": [
+   40,
+   40,
+   20
+  ]
+ }
+}

tests/kernel-cases/solids/cov-align-side-face-turns-onto-top-face/recipe.json

@@ -0,0 +1,45 @@
+{
+ "commands": [
+  {
+   "command": "solid.box",
+   "params": {
+    "length": 40,
+    "width": 40,
+    "height": 10,
+    "body_name": "Base"
+   }
+  },
+  {
+   "command": "solid.box",
+   "params": {
+    "length": 10,
+    "width": 10,
+    "height": 20,
+    "corner": [
+     100,
+     0,
+     0
+    ],
+    "body_name": "Post"
+   }
+  },
+  {
+   "command": "solid.align",
+   "params": {
+    "bodies": [
+     "Post"
+    ],
+    "from_face": [
+     110,
+     5,
+     10
+    ],
+    "to_face": [
+     20,
+     20,
+     10
+    ]
+   }
+  }
+ ]
+}