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/Romanian Deadlift.info.md

@@ -0,0 +1,39 @@
+# Romanian Deadlift
+
+The stretch-focused hip hinge — push the hips back with soft knees until
+the hamstrings stop you, then stand back up. Barbell or dumbbells.
+
+- **Category:** Main circuit
+- **Type:** Free-weight hinge (barbell or dumbbells)
+- **Targets:** Hamstrings, glutes, spinal erectors
+- **Prescription:** 3 × 8–10
+
+## Setup
+
+Stand tall holding the bar (or dumbbells) at the hips, feet hip-width,
+knees unlocked. Set your shoulders back and brace.
+
+## Execution
+
+1. Push the hips straight back and let the weight slide down the thighs,
+   back flat, knees only slightly bent.
+2. Stop when the hamstrings are fully stretched — usually just below the
+   knees — without the back rounding.
+3. Drive the hips forward to stand tall again.
+
+## Cues
+
+- The hips travel backward, not down — this is not a squat.
+- Weight stays close to the legs the whole rep.
+- Feel the hamstrings load on the way down; that stretch is the exercise.
+
+## Common Mistakes
+
+- Bending the knees more as the weight lowers, turning it into a deadlift.
+- Rounding the back to reach the floor — depth comes from the hips.
+- Rushing the lowering phase.
+
+## Progression
+
+Add weight once the full stretch is reached with a flat back every rep;
+single-leg RDLs for balance and asymmetry work.