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/WorkoutLog.swift

@@ -0,0 +1,43 @@
+import Foundation
+import CoreData
+
+@objc(WorkoutLog)
+public class WorkoutLog: NSManagedObject, Identifiable {
+    @NSManaged public var date: Date
+    @NSManaged public var sets: Int32
+    @NSManaged public var reps: Int32
+    @NSManaged public var weight: Int32
+    @NSManaged private var statusRaw: String?
+    @NSManaged public var order: Int32
+    @NSManaged public var exerciseName: String
+    @NSManaged public var currentStateIndex: Int32
+    @NSManaged public var elapsedSeconds: Int32
+    @NSManaged public var completed: Bool
+
+    @NSManaged public var workout: Workout?
+
+    public var id: NSManagedObjectID { objectID }
+
+    var status: WorkoutStatus? {
+        get {
+            guard let raw = statusRaw else { return nil }
+            return WorkoutStatus(rawValue: raw)
+        }
+        set { statusRaw = newValue?.rawValue }
+    }
+}
+
+// MARK: - Fetch Request
+
+extension WorkoutLog {
+    @nonobjc public class func fetchRequest() -> NSFetchRequest<WorkoutLog> {
+        return NSFetchRequest<WorkoutLog>(entityName: "WorkoutLog")
+    }
+
+    static func orderedFetchRequest(for workout: Workout) -> NSFetchRequest<WorkoutLog> {
+        let request = fetchRequest()
+        request.predicate = NSPredicate(format: "workout == %@", workout)
+        request.sortDescriptors = [NSSortDescriptor(keyPath: \WorkoutLog.order, ascending: true)]
+        return request
+    }
+}