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/Shoulder Press/frames/frame-2.svg

@@ -7,9 +7,11 @@
   <path d="M 110.0 151.0 L 142.0 151.0" stroke="#c5cad4" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="arm_l" d="M 101.1 50.8 L 118.8 26.6 L 143.0 8.9" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_l" d="M 126.0 132.0 L 167.4 112.0 L 168.0 152.0 L 179.0 151.8" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 101.1 50.8 L 95.1 48.8 L 95.1 48.8" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 126.0 132.0 L 120.0 130.0 L 120.0 130.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 120.0 130.0 Q 103.0 89.8 95.1 48.8" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 95.1 48.8 L 112.8 24.6 L 137.0 6.9" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_r" d="M 120.0 130.0 L 161.9 111.1 L 164.0 151.0 L 175.0 150.4" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_r" d="M 95.1 48.8 L 112.8 24.6 L 137.0 6.9" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path d="M 130.0 7.9 L 150.0 7.9" stroke="#6b7180" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="98.6" cy="29.1" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
   <line id="nose" x1="108.5" y1="27.8" x2="115.4" y2="26.8" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>