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

WorkoutsTests/ExerciseMotionTests.swift

@@ -21,8 +21,9 @@ struct ExerciseMotionTests {
     }
 
     @Test func exerciseWithoutBundledMotionLoadsNothing() {
-        #expect(ExerciseMotionLibrary.resources(for: "Bench Press") == nil)
-        #expect(FigureAnimation(exerciseName: "Bench Press") == nil)
+        // Cardio equipment is a permanent library exclusion (see COVERAGE.md).
+        #expect(ExerciseMotionLibrary.resources(for: "Treadmill") == nil)
+        #expect(FigureAnimation(exerciseName: "Treadmill") == nil)
     }
 
     /// Resolving Bird Dog's first key frame must reproduce the reference IK: both
@@ -130,7 +131,7 @@ struct ExerciseMotionTests {
             bundle.url(forResource: "figure-fixtures", withExtension: "json"),
             "figure-fixtures.json must be bundled as a WorkoutsTests resource (see project.yml)")
         let fixtures = try JSONDecoder().decode(FigureFixtures.self, from: Data(contentsOf: url))
-        #expect(fixtures.exercises.count == 22)
+        #expect(fixtures.exercises.count == 47)
 
         for exercise in fixtures.exercises {
             let resources = try #require(ExerciseMotionLibrary.resources(for: exercise.name),