Give the figure real girdles, fix orbit pinning, add roller pads

Shoulder and pelvis widths grow to human-like proportions per profile
(shoulders wider than hips for neutral/male, reversed for female) and
are now drawn — bars across the attach points that read near-full-width
face-on and as a shoulder/hip nub in profile, so limbs visibly hang
from a torso instead of a point. Orbiting no longer re-solves IK pins
in the rotated view (pins are canvas targets in the authored camera):
the pose resolves first and the posed body rotates, which fixes hands
sticking to stale screen points mid-orbit (Cat-Cow, Bird Dog, Plank).
Leg Extension and Leg Curl swap their ankle bars for a machine roller
disc — a new `roller` prop riding the shin's press side. Fixtures
regenerated; both renderers updated in lockstep.

Claude-Session: https://claude.ai/code/session_01LEoff8bXGBS83tK1c55Mf7

Exercise Library/Calfs/frames/frame-2.svg

@@ -9,9 +9,11 @@
   <path d="M 164.0 76.0 L 183.0 76.0" stroke="#6b7180" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="arm_l" d="M 134.1 35.9 L 162.0 47.1 L 170.0 76.0" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_l" d="M 146.0 120.0 L 190.9 109.9 L 216.0 141.0 L 226.3 137.1" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 134.1 35.9 L 128.1 33.9 L 128.1 33.9" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 146.0 120.0 L 140.0 118.0 L 140.0 118.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 140.0 118.0 Q 131.0 75.4 128.1 33.9" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 128.1 33.9 L 155.7 45.8 L 166.0 74.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_r" d="M 140.0 118.0 L 185.2 109.3 L 212.0 139.0 L 222.0 134.5" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_r" d="M 128.1 33.9 L 155.7 45.8 L 166.0 74.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path d="M 174.0 109.6 L 202.0 109.6" stroke="#6b7180" stroke-width="7" stroke-linecap="round" stroke-linejoin="round"/>
   <path d="M 207.2 141.8 L 220.8 138.2" stroke="#6b7180" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="131.6" cy="14.2" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>