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/Dumbbell Curl.info.md

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+# Dumbbell Curl
+
+The free-weight biceps curl — elbows pinned to the sides, curl both
+dumbbells from a full hang to the shoulders.
+
+- **Category:** Main circuit
+- **Type:** Free-weight elbow flexion (dumbbells)
+- **Targets:** Biceps, forearms
+- **Prescription:** 3 × 10–12
+
+## Setup
+
+Stand tall with a dumbbell in each hand at your sides, palms forward (or
+turning as you curl), elbows lightly touching the ribs.
+
+## Execution
+
+1. Curl both weights up in an arc until the forearms reach the biceps.
+2. Keep the elbows fixed in place at your sides.
+3. Lower all the way to straight arms — the stretch counts.
+
+## Cues
+
+- Elbows are hinges, not swings — they never travel forward or back.
+- Wrists stay neutral; no flicking at the top.
+- Stand tall; the trunk does not rock.
+
+## Common Mistakes
+
+- Swinging the hips to start the rep.
+- Half reps that skip the bottom stretch.
+- Elbows drifting forward, turning it into a front raise.
+
+## Progression
+
+Add weight only while the torso stays statue-still; alternate arms or
+curl seated to remove all momentum.