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/Settings/SettingsView.swift

@@ -6,20 +6,14 @@
 //
 
 import SwiftUI
-import CoreData
+import SwiftData
 import IndieAbout
 
 struct SettingsView: View {
-    @Environment(\.managedObjectContext) private var viewContext
+    @Environment(SyncEngine.self) private var sync
+    @Environment(\.modelContext) private var modelContext
 
-    @FetchRequest(
-        sortDescriptors: [
-            NSSortDescriptor(keyPath: \Split.order, ascending: true),
-            NSSortDescriptor(keyPath: \Split.name, ascending: true)
-        ],
-        animation: .default
-    )
-    private var splits: FetchedResults<Split>
+    @Query(sort: \Split.order) private var splits: [Split]
 
     @State private var showingAddSplitSheet = false
 
@@ -47,7 +41,7 @@ struct SettingsView: View {
                             Spacer()
                         }
                     } else {
-                        ForEach(splits, id: \.objectID) { split in
+                        ForEach(splits) { split in
                             NavigationLink {
                                 SplitDetailView(split: split)
                             } label: {
@@ -73,12 +67,16 @@ struct SettingsView: View {
                             Text("Add Split")
                         }
                     }
-                }
 
-                // MARK: - Account Section
-                Section(header: Text("Account")) {
-                    Text("Settings coming soon")
-                        .foregroundColor(.secondary)
+                    Button {
+                        Task { await SplitSeeder.seedDefaults(into: modelContext, using: sync) }
+                    } label: {
+                        HStack {
+                            Image(systemName: "wand.and.sparkles")
+                                .foregroundColor(.accentColor)
+                            Text("Add Starter Splits")
+                        }
+                    }
                 }
 
                 // MARK: - About Section
@@ -99,8 +97,3 @@ struct SettingsView: View {
         }
     }
 }
-
-#Preview {
-    SettingsView()
-        .environment(\.managedObjectContext, PersistenceController.preview.viewContext)
-}