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/Dead Bug/frames/frame-1.svg

@@ -3,9 +3,11 @@
   <line x1="16" y1="156" x2="304" y2="156" stroke="#b9bec9" stroke-width="3" stroke-linecap="round"/>
   <path id="arm_l" d="M 106.0 150.0 L 106.0 120.0 L 106.0 90.0" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_l" d="M 191.0 150.0 L 211.2 108.7 L 250.6 115.6 L 252.5 104.8" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 106.0 150.0 L 100.0 148.0 L 100.0 148.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 191.0 150.0 L 185.0 148.0 L 185.0 148.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 185.0 148.0 Q 141.5 148.0 100.0 148.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 100.0 148.0 L 100.0 118.0 L 100.0 88.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_r" d="M 185.0 148.0 L 205.2 106.7 L 244.6 113.6 L 246.5 102.8" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_r" d="M 100.0 148.0 L 100.0 118.0 L 100.0 88.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="80.4" cy="143.8" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
   <line id="nose" x1="80.4" y1="133.8" x2="80.4" y2="126.8" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>
   <g font-family="-apple-system, Helvetica, sans-serif" font-size="11" fill="#6b7180">

Exercise Library/Dead Bug/frames/frame-2.svg

@@ -3,9 +3,11 @@
   <line x1="16" y1="156" x2="304" y2="156" stroke="#b9bec9" stroke-width="3" stroke-linecap="round"/>
   <path id="arm_l" d="M 106.0 150.0 L 106.0 120.0 L 106.0 90.0" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_l" d="M 191.0 150.0 L 235.2 137.3 L 273.7 126.3 L 270.6 115.7" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 106.0 150.0 L 100.0 148.0 L 100.0 148.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 191.0 150.0 L 185.0 148.0 L 185.0 148.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 185.0 148.0 Q 141.5 148.0 100.0 148.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 100.0 148.0 L 78.8 126.8 L 57.6 105.6" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_r" d="M 185.0 148.0 L 205.2 106.7 L 244.6 113.6 L 246.5 102.8" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_r" d="M 100.0 148.0 L 78.8 126.8 L 57.6 105.6" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="80.4" cy="143.8" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
   <line id="nose" x1="80.4" y1="133.8" x2="80.4" y2="126.8" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>
   <g font-family="-apple-system, Helvetica, sans-serif" font-size="11" fill="#6b7180">

Exercise Library/Dead Bug/frames/frame-3.svg

@@ -3,9 +3,11 @@
   <line x1="16" y1="156" x2="304" y2="156" stroke="#b9bec9" stroke-width="3" stroke-linecap="round"/>
   <path id="arm_l" d="M 106.0 150.0 L 106.0 120.0 L 106.0 90.0" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_l" d="M 191.0 150.0 L 211.2 108.7 L 250.6 115.6 L 252.5 104.8" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 106.0 150.0 L 100.0 148.0 L 100.0 148.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 191.0 150.0 L 185.0 148.0 L 185.0 148.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 185.0 148.0 Q 141.5 148.0 100.0 148.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 100.0 148.0 L 100.0 118.0 L 100.0 88.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_r" d="M 185.0 148.0 L 205.2 106.7 L 244.6 113.6 L 246.5 102.8" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_r" d="M 100.0 148.0 L 100.0 118.0 L 100.0 88.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="80.4" cy="143.8" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
   <line id="nose" x1="80.4" y1="133.8" x2="80.4" y2="126.8" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>
   <g font-family="-apple-system, Helvetica, sans-serif" font-size="11" fill="#6b7180">

Exercise Library/Dead Bug/frames/frame-4.svg

@@ -3,9 +3,11 @@
   <line x1="16" y1="156" x2="304" y2="156" stroke="#b9bec9" stroke-width="3" stroke-linecap="round"/>
   <path id="arm_l" d="M 106.0 150.0 L 84.8 128.8 L 63.6 107.6" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_l" d="M 191.0 150.0 L 211.2 108.7 L 250.6 115.6 L 252.5 104.8" stroke="#86cfc5" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 106.0 150.0 L 100.0 148.0 L 100.0 148.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 191.0 150.0 L 185.0 148.0 L 185.0 148.0" stroke="#3a3f4b" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="spine" d="M 185.0 148.0 Q 141.5 148.0 100.0 148.0" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_r" d="M 100.0 148.0 L 100.0 118.0 L 100.0 88.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <path id="leg_r" d="M 185.0 148.0 L 229.2 135.3 L 267.7 124.3 L 264.6 113.7" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_r" d="M 100.0 148.0 L 100.0 118.0 L 100.0 88.0" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
   <circle id="head" cx="80.4" cy="143.8" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
   <line id="nose" x1="80.4" y1="133.8" x2="80.4" y2="126.8" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>
   <g font-family="-apple-system, Helvetica, sans-serif" font-size="11" fill="#6b7180">