Add CoreData-based workout tracking app with iOS and watchOS targets

- Migrate from SwiftData to CoreData with CloudKit sync
- Add core models: Split, Exercise, Workout, WorkoutLog
- Implement tab-based UI: Workout Logs, Splits, Settings
- Add SF Symbols picker for split icons
- Add exercise picker filtered by split with exclusion of added exercises
- Integrate IndieAbout for settings/about section
- Add Yams for YAML exercise definition parsing
- Include starter exercise libraries (bodyweight, Planet Fitness)
- Add Date extensions for formatting (formattedTime, isSameDay)
- Format workout date ranges to show time-only for same-day end dates
- Add build number update script
- Add app icons

Workouts Watch App/Models/Exercise.swift

@@ -0,0 +1,54 @@
+import Foundation
+import CoreData
+
+@objc(Exercise)
+public class Exercise: NSManagedObject, Identifiable {
+    @NSManaged public var name: String
+    @NSManaged public var loadType: Int32
+    @NSManaged public var order: Int32
+    @NSManaged public var sets: Int32
+    @NSManaged public var reps: Int32
+    @NSManaged public var weight: Int32
+    @NSManaged public var duration: Date?
+    @NSManaged public var weightLastUpdated: Date?
+    @NSManaged public var weightReminderTimeIntervalWeeks: Int32
+
+    @NSManaged public var split: Split?
+
+    public var id: NSManagedObjectID { objectID }
+
+    var loadTypeEnum: LoadType {
+        get { LoadType(rawValue: Int(loadType)) ?? .weight }
+        set { loadType = Int32(newValue.rawValue) }
+    }
+}
+
+// MARK: - Fetch Request
+
+extension Exercise {
+    @nonobjc public class func fetchRequest() -> NSFetchRequest<Exercise> {
+        return NSFetchRequest<Exercise>(entityName: "Exercise")
+    }
+
+    static func orderedFetchRequest(for split: Split) -> NSFetchRequest<Exercise> {
+        let request = fetchRequest()
+        request.predicate = NSPredicate(format: "split == %@", split)
+        request.sortDescriptors = [NSSortDescriptor(keyPath: \Exercise.order, ascending: true)]
+        return request
+    }
+}
+
+
+enum LoadType: Int, CaseIterable {
+    case none = 0
+    case weight = 1
+    case duration = 2
+
+    var name: String {
+        switch self {
+        case .none: "None"
+        case .weight: "Weight"
+        case .duration: "Duration"
+        }
+    }
+}