Add the free-weight canon and bodyweight staples (16 exercises)

Squat/lunge: Barbell Squat, Goblet Squat, Bodyweight Squat, Lunge.
Bench station: Bench Press, Incline Bench Press, Dumbbell Bench Press,
Dumbbell Fly (the fly authors the face-on camera for its frontal arc).
Dumbbell rack: Dumbbell Row, Dumbbell Shoulder Press, Dumbbell Curl,
Lateral Raise - first uses of the dumbbell prop. Bodyweight: Push-Up,
Pull-Up, Crunch, Dip.

Claude-Session: https://claude.ai/code/session_01HJDQQDA9QdP8zByg43H5v3

Exercise Library/Lateral Raise/motion.json

@@ -0,0 +1,32 @@
+{
+  "name": "Lateral Raise",
+  "primary": 2,
+  "camera": {"yaw": 90, "zoom": 0.7},
+  "working": ["arm_r", "arm_l"],
+  "props": [
+    {"type": "dumbbell", "at": "hand_r"},
+    {"type": "dumbbell", "at": "hand_l"}
+  ],
+  "frames": [
+    {
+      "hold": 0.4, "tween": 1.0,
+      "root": {"pos": [160, 64]},
+      "spine": [0, 0],
+      "neck": 0, "head": 0,
+      "shoulder_r": {"flexion": 4, "abduction": 8}, "elbow_r": 10,
+      "shoulder_l": {"flexion": 4, "abduction": 8}, "elbow_l": 10,
+      "hip_r": {"flexion": 0, "abduction": 6}, "knee_r": 0,
+      "hip_l": {"flexion": 0, "abduction": 6}, "knee_l": 0
+    },
+    {
+      "hold": 0.5, "tween": 1.3,
+      "root": {"pos": [160, 64]},
+      "spine": [0, 0],
+      "neck": 0, "head": 0,
+      "shoulder_r": {"flexion": 4, "abduction": 88}, "elbow_r": 12,
+      "shoulder_l": {"flexion": 4, "abduction": 88}, "elbow_l": 12,
+      "hip_r": {"flexion": 0, "abduction": 6}, "knee_r": 0,
+      "hip_l": {"flexion": 0, "abduction": 6}, "knee_l": 0
+    }
+  ]
+}