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/Seated Row/frames/frame-1.svg

@@ -7,9 +7,11 @@
   <path d="M 244.0 120.0 L 202.0 63.0" stroke="#c5cad4" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="arm_l" d="M 155.6 39.6 L 174.0 63.3 L 204.0 64.0" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_l" d="M 146.0 124.0 L 189.5 109.1 L 192.0 149.0 L 203.0 148.3" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 155.6 39.6 L 149.6 37.6 L 149.6 37.6" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 146.0 124.0 L 140.0 122.0 L 140.0 122.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 140.0 122.0 Q 142.7 78.5 149.6 37.6" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 149.6 37.6 L 170.1 59.5 L 200.0 62.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_r" d="M 140.0 122.0 L 183.9 108.2 L 188.0 148.0 L 198.9 146.9" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_r" d="M 149.6 37.6 L 170.1 59.5 L 200.0 62.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path d="M 202.0 70.0 L 202.0 56.0" stroke="#6b7180" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="153.1" cy="17.9" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
   <line id="nose" x1="163.0" y1="17.0" x2="170.0" y2="16.4" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>