Ship the 47-exercise library in-app: export, fixtures, tests, docs

render.py --export bundles the 25 new motion rigs and info pages;
figure-fixtures.json regenerated for all 47 (the Swift solver reproduces
every new motion, including negative-y pins and the new prop uses). The
fixture count assertion moves to 47, and the no-bundled-motion test now
uses Treadmill - a permanent COVERAGE.md exclusion - since Bench Press
exists. 48 tests green; watch target builds. Coverage handoff complete -
TODO-coverage.md retired.

Claude-Session: https://claude.ai/code/session_01HJDQQDA9QdP8zByg43H5v3

Workouts/Resources/ExerciseMotions/Hip Thrust.info.md

@@ -0,0 +1,38 @@
+# Hip Thrust
+
+The loaded glute bridge — shoulders on a bench, barbell across the hips,
+drive the hips up to a straight line.
+
+- **Category:** Main circuit
+- **Type:** Free-weight hip extension
+- **Targets:** Glutes, hamstrings
+- **Prescription:** 4 × 8–10
+
+## Setup
+
+Sit on the floor with your upper back against a bench, the bar (padded)
+across your hips, hands steadying it. Feet flat, hip-width, heels under
+the knees.
+
+## Execution
+
+1. Brace, tuck the chin, and drive through the heels to lift the hips.
+2. Stop when shoulders, hips and knees are level — a flat tabletop.
+3. Squeeze the glutes at the top, then lower the hips under control.
+
+## Cues
+
+- Chin tucked, ribs down — the body hinges around the bench edge.
+- Full lockout comes from the glutes, not from arching the back.
+- Shins vertical at the top; adjust foot distance until they are.
+
+## Common Mistakes
+
+- Overarching the lower back instead of finishing with the glutes.
+- Feet too far forward, turning it into a hamstring exercise.
+- Cutting the range short at the top.
+
+## Progression
+
+Start with the bar alone to groove the pattern, then add plates; pause
+reps at the top for extra glute work.