Workouts 2.0: re-base persistence on iCloud Drive documents

Replace Core Data + NSPersistentCloudKitContainer + App-Group store +
WatchConnectivity dictionary sync with the QuickRabbit iCloud-documents
architecture:

- iCloud Drive JSON documents are the sole source of truth (one file per
  aggregate: Splits/<ULID>.json, Workouts/YYYY/MM/<ULID>.json), with a
  rebuildable SwiftData cache populated only by an NSMetadataQuery observer
  and a connect-time reconcile. Soft-delete tombstones; hard iCloud gate.
- Shared model layer (ULID, Codable *Documents + stateless mappers, @Model
  cache entities, SwiftData container) compiled into both targets.
- New iPhone<->Watch bridge over WatchConnectivity keyed by ULIDs; the phone
  is the sole writer of iCloud Drive, the watch round-trips documents.
- AppServices DI + iCloud-required root gate; Swift 6 strict concurrency.
- Starter splits generated on demand from the bundled YAML catalogs.
- Migrate to XcodeGen (project.yml), iOS 26 / watchOS 26; CloudDocuments
  entitlement (drop CloudKit/App Group/aps-environment).
- Duration stored as Int seconds (was a Date epoch hack); fix workout
  end-on-create, undismissable delete dialog, toolbar-hiding nav stacks,
  and the Settings placeholder.
- Add README/CHANGELOG/LICENSE, .gitignore, refreshed REQUIREMENTS, and the
  Scripts/ TestFlight pipeline (release.sh + ASC API scripts).

MARKETING_VERSION 2.0.

Workouts/Views/Splits/OrderableItem.swift

@@ -6,25 +6,5 @@
 //
 // Copyright 2025 Rouslan Zenetl. All Rights Reserved.
 //
-
-import Foundation
-
-/// Protocol for items that can be ordered in a sequence
-protocol OrderableItem {
-    /// Updates the order of the item to the specified index
-    func updateOrder(to index: Int)
-}
-
-/// Extension to make Split conform to OrderableItem
-extension Split: OrderableItem {
-    func updateOrder(to index: Int) {
-        self.order = Int32(index)
-    }
-}
-
-/// Extension to make Exercise conform to OrderableItem
-extension Exercise: OrderableItem {
-    func updateOrder(to index: Int) {
-        self.order = Int32(index)
-    }
-}
+// No longer used — reordering is now a SyncEngine document write (onMove → doc save).
+// File kept to avoid Xcode project reference errors.