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/Tricep Press/visual.svg

@@ -7,9 +7,11 @@
   <path d="M 110.0 151.0 L 140.0 151.0" stroke="#c5cad4" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="arm_l" d="M 110.7 42.1 L 113.1 72.0 L 128.0 98.0" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_l" d="M 124.0 126.0 L 168.1 112.8 L 160.0 152.0 L 170.8 154.2" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 110.7 42.1 L 104.7 40.1 L 104.7 40.1" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 124.0 126.0 L 118.0 124.0 L 118.0 124.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 118.0 124.0 Q 109.7 81.3 104.7 40.1" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 104.7 40.1 L 109.7 69.6 L 124.0 96.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_r" d="M 118.0 124.0 L 162.3 111.5 L 156.0 151.0 L 166.9 152.7" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_r" d="M 104.7 40.1 L 109.7 69.6 L 124.0 96.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path d="M 126.0 103.0 L 126.0 91.0" stroke="#6b7180" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="106.1" cy="20.1" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
   <line id="nose" x1="116.0" y1="19.1" x2="123.0" y2="18.3" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>