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

CHANGELOG.md

@@ -1,5 +1,9 @@
 **July 2026**
 
+The stick figure now has broader, more human proportions with a visible shoulder girdle and pelvis.
+
+The Leg Extension and Leg Curl form guides now press against a roller pad at the ankle, like the real machines.
+
 Bodyweight form guides now slowly circle around the figure while it moves, showing the exercise from every side.
 
 The form-guide figures now have feet — heels rise on calf raises, toes point through leg lifts, and kneeling feet rest naturally.