View the figure from a slight elevation and refine the leg-machine rollers

The default camera pitches down 10 degrees, so the floor reads as a
plane (drawn as a rectangle) and near/far contacts straddle it.
Elevation is pure presentation - IK pins solve in the flat authored
view and the posed body tilts, the same pattern as the orbit, so
authored canvas targets never go out of reach. The leg-extension
roller moves up onto the shin above the ankle and the leg-curl roller
tucks under the heel. Fixtures and reference test values regenerated
for the pitched camera.

Claude-Session: https://claude.ai/code/session_01LEoff8bXGBS83tK1c55Mf7

Exercise Library/Plank/frames/frame-1.svg

@@ -1,15 +1,15 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 320 180" fill="none">
   <title>Plank</title>
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-  <path id="arm_r" d="M 93.3 123.4 L 93.3 153.4 L 63.3 153.4" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="leg_r" d="M 178.0 116.0 L 204.4 153.7 L 244.4 153.7 L 244.4 164.7" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="girdle" d="M 87.3 121.4 L 87.3 121.4 L 93.3 123.4" stroke="#0d9488" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="pelvisBar" d="M 172.0 114.0 L 172.0 114.0 L 178.0 116.0" stroke="#0d9488" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="spine" d="M 172.0 114.0 Q 128.7 117.8 87.3 121.4" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="leg_l" d="M 172.0 114.0 L 198.4 151.7 L 238.4 151.7 L 238.4 162.7" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <path id="arm_l" d="M 87.3 121.4 L 87.3 151.4 L 57.3 151.4" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
-  <circle id="head" cx="67.4" cy="123.2" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
-  <line id="nose" x1="58.7" y1="128.2" x2="52.7" y2="131.7" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>
+  <rect x="16" y="150.8" width="288" height="10.4" rx="3" fill="none" stroke="#b9bec9" stroke-width="3"/>
+  <path id="arm_r" d="M 93.2 121.4 L 93.2 150.9 L 63.2 150.9" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="leg_r" d="M 177.9 114.8 L 204.3 151.9 L 244.3 151.9 L 244.3 162.7" stroke="#a9afba" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="girdle" d="M 87.3 123.2 L 87.3 121.3 L 93.2 121.4" stroke="#0d9488" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="pelvisBar" d="M 172.0 115.2 L 172.0 114.0 L 177.9 114.8" stroke="#0d9488" stroke-width="5" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="spine" d="M 172.0 114.0 Q 128.7 117.7 87.3 121.3" stroke="#0d9488" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="leg_l" d="M 172.0 115.2 L 198.4 152.3 L 238.4 152.3 L 238.4 163.2" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <path id="arm_l" d="M 87.3 123.2 L 87.3 152.8 L 57.3 152.8" stroke="#3a3f4b" stroke-width="6" stroke-linecap="round" stroke-linejoin="round"/>
+  <circle id="head" cx="67.4" cy="123.0" r="10" fill="white" stroke="#3a3f4b" stroke-width="6"/>
+  <line id="nose" x1="58.7" y1="128.0" x2="52.6" y2="131.4" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>
   <g font-family="-apple-system, Helvetica, sans-serif" font-size="11" fill="#6b7180">
     <line x1="224" y1="16" x2="238" y2="16" stroke="#3a3f4b" stroke-width="4" stroke-linecap="round"/>
     <text x="243" y="20">near</text>