Add Warm-Up and Stretching activity types

Adds WorkoutActivityType.warmUp (HealthKit .preparationAndRecovery) and
.stretching (.flexibility), and retags the six starter splits that were all
mislabeled as Functional Strength:

- Warm-Up:    Upper Body Warm-Up, Lower Body Warm-Up, Morning Wake-Up
- Stretching: Morning Mobility, Full Body Stretch, Evening Stretch

The split editor's activity picker surfaces them automatically (CaseIterable).
Older app versions decode the new raw values as the default type — additive and
not schema-gated, so no quarantine.

Workouts/ExerciseFigure/ExerciseMotion.swift

@@ -19,7 +19,26 @@ import Foundation
 /// exported by `render.py --export` into `Resources/ExerciseMotions/` — `skeleton.json`
 /// plus one `<Exercise Name>.motion.json` per library entry.
 
-/// Bone lengths for one figure profile (`neutral` is the only one the app renders).
+/// The figure build the exercise animation renders. A presentation-only choice of
+/// skeleton profile (bone proportions) — the motion scripts are identical across builds,
+/// so switching never touches an exercise's animation, only its dimensions. The raw value
+/// is the `skeleton.json` profile key; persisted via `@AppStorage("figureProfile")`.
+enum FigureProfile: String, CaseIterable {
+    case neutral
+    case feminine = "female"
+    case masculine = "male"
+
+    var displayName: String {
+        switch self {
+        case .neutral: "Neutral"
+        case .feminine: "Feminine"
+        case .masculine: "Masculine"
+        }
+    }
+}
+
+/// Bone lengths for one figure profile (`neutral`, `female`, or `male`; the app picks
+/// one per the `figureProfile` setting — see `FigureProfile`).
 struct SkeletonProfile: Codable {
     let headR: Double
     let neck: Double
@@ -270,10 +289,10 @@ enum ExerciseMotionLibrary {
             .sorted()
     }()
 
-    /// The motion script plus the neutral skeleton profile for `exerciseName`, or `nil`
-    /// when no bundled motion matches (most exercises have none — the caller keeps
-    /// its space empty).
-    static func resources(for exerciseName: String) -> Resources? {
+    /// The motion script plus the requested skeleton `profile` for `exerciseName`, or
+    /// `nil` when no bundled motion matches (most exercises have none — the caller keeps
+    /// its space empty). An unknown profile key falls back to `neutral`.
+    static func resources(for exerciseName: String, profile: FigureProfile = .neutral) -> Resources? {
         guard
             let motionURL = Bundle.main.url(forResource: exerciseName, withExtension: "motion.json"),
             let skeletonURL = Bundle.main.url(forResource: "skeleton", withExtension: "json"),
@@ -281,7 +300,7 @@ enum ExerciseMotionLibrary {
             let skeletonData = try? Data(contentsOf: skeletonURL),
             let motion = try? JSONDecoder().decode(ExerciseMotion.self, from: motionData),
             let skeleton = try? JSONDecoder().decode(Skeleton.self, from: skeletonData),
-            let profile = skeleton.profiles["neutral"]
+            let profile = skeleton.profiles[profile.rawValue] ?? skeleton.profiles[FigureProfile.neutral.rawValue]
         else { return nil }
         return Resources(motion: motion, profile: profile)
     }