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/Abdominal/frames/frame-2.svg

@@ -8,9 +8,11 @@
   <path d="M 156.0 149.0 L 190.0 149.0" stroke="#c5cad4" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="arm_l" d="M 173.6 58.7 L 201.9 48.6 L 196.0 78.0" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_l" d="M 134.0 128.0 L 176.4 110.2 L 172.0 150.0 L 182.9 151.2" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 173.6 58.7 L 167.6 56.7 L 167.6 56.7" stroke="#0d9488" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 134.0 128.0 L 128.0 126.0 L 128.0 126.0" stroke="#0d9488" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 128.0 126.0 Q 123.1 76.0 167.6 56.7" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 167.6 56.7 L 195.9 46.6 L 190.0 76.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_r" d="M 128.0 126.0 L 171.2 110.1 L 168.0 150.0 L 179.0 150.9" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_r" d="M 167.6 56.7 L 195.9 46.6 L 190.0 76.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path d="M 193.0 91.0 L 193.0 63.0" stroke="#6b7180" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="186.2" cy="49.2" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
   <line id="nose" x1="193.6" y1="55.9" x2="198.8" y2="60.5" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>