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.

project.yml

@@ -0,0 +1,82 @@
+name: Workouts
+options:
+  bundleIdPrefix: dev.rzen.indie
+  deploymentTarget:
+    iOS: "26.0"
+    watchOS: "26.0"
+  xcodeVersion: "26.0"
+  defaultConfig: Debug
+
+settings:
+  base:
+    SWIFT_VERSION: "6.0"
+    DEVELOPMENT_TEAM: ${APPLE_TEAM_ID}
+    MARKETING_VERSION: "2.0"
+    CURRENT_PROJECT_VERSION: "1"
+    ENABLE_USER_SCRIPT_SANDBOXING: "NO"
+
+packages:
+  IndieAbout:
+    url: https://git.rzen.dev/rzen/indie-about.git
+    from: "0.1.0"
+  Yams:
+    url: https://github.com/jpsim/Yams
+    from: "6.0.0"
+
+targets:
+  # ---- iOS app (owns iCloud Drive sync; embeds the watch app) ----------------
+  Workouts:
+    type: application
+    platform: iOS
+    sources:
+      - path: Shared
+      - path: Workouts
+        excludes:
+          - "Resources/Info-*.plist"
+          - "Resources/*.entitlements"
+      - path: CHANGELOG.md
+        buildPhase: resources
+        type: file
+      - path: README.md
+        buildPhase: resources
+        type: file
+      - path: LICENSE.md
+        buildPhase: resources
+        type: file
+    dependencies:
+      - package: IndieAbout
+      - package: Yams
+      - target: Workouts Watch App
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: dev.rzen.indie.Workouts
+        INFOPLIST_FILE: Workouts/Resources/Info-iOS.plist
+        CODE_SIGN_ENTITLEMENTS: Workouts/Resources/Workouts-iOS.entitlements
+        GENERATE_INFOPLIST_FILE: false
+        SWIFT_STRICT_CONCURRENCY: complete
+        IPHONEOS_DEPLOYMENT_TARGET: "26.0"
+        ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
+        ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME: AccentColor
+        TARGETED_DEVICE_FAMILY: "1,2"
+        DEVELOPMENT_ASSET_PATHS: "\"Workouts/Preview Content\""
+
+  # ---- watchOS app (no iCloud; syncs through the phone via WatchConnectivity) -
+  Workouts Watch App:
+    type: application
+    platform: watchOS
+    sources:
+      - path: Shared
+      - path: Workouts Watch App
+        excludes:
+          - "Resources/Info-*.plist"
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: dev.rzen.indie.Workouts.watchkitapp
+        INFOPLIST_FILE: "Workouts Watch App/Resources/Info-watchOS.plist"
+        GENERATE_INFOPLIST_FILE: false
+        SWIFT_STRICT_CONCURRENCY: complete
+        WATCHOS_DEPLOYMENT_TARGET: "26.0"
+        ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
+        ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME: AccentColor
+        TARGETED_DEVICE_FAMILY: "4"
+        DEVELOPMENT_ASSET_PATHS: "\"Workouts Watch App/Preview Content\""