Add the macOS app: a library-management companion (routines, schedules, exercise browser)

A new 'Workouts Mac' target (same bundle ID as iOS, universal purchase)
with a NavigationSplitView shell over the shared data/sync layers:
routine management with starter gallery and seed-fork follow, schedule
editing (reminders stay iPhone-scheduled), and a browse-only exercise
library with the animated figures and reference guides.

Multi-writer stance: the Mac writes only routine and schedule documents
(whole-document last-writer-wins) and never workout documents, whose
per-log merge exists only on the watch ingest path. The Mac reconciles
on window activation (throttled) since iCloud syncs while the app is
closed, and flushes pending writes on deactivation.

project.yml

@@ -4,6 +4,7 @@ options:
   deploymentTarget:
     iOS: "26.0"
     watchOS: "26.0"
+    macOS: "26.0"
   xcodeVersion: "26.0"
   defaultConfig: Debug
 
@@ -184,3 +185,52 @@ targets:
         SWIFT_STRICT_CONCURRENCY: complete
         IPHONEOS_DEPLOYMENT_TARGET: "26.0"
         TARGETED_DEVICE_FAMILY: "1"
+
+  # ---- macOS app (library management MVP: routines/schedules/exercises; no
+  #      workout running/editing). Same bundle id as the iOS app (universal
+  #      purchase); writes only Splits/ and Schedules/ documents. -------------
+  Workouts Mac:
+    type: application
+    platform: macOS
+    sources:
+      - path: Shared
+        excludes:
+          - "HealthKit/**"
+      - path: Workouts/Sync
+      - path: Workouts/Seed
+      - path: Workouts/ExerciseFigure
+      - path: Workouts/Views/Exercises/ExerciseCatalog.swift
+      - path: "Workouts/Views/Exercises/ExerciseDocument+PlanSummary.swift"
+      - path: Workouts/Views/Exercises/ExerciseInfoContent.swift
+      - path: Workouts/Views/Routines/RoutineOrdering.swift
+      - path: Workouts/Views/Library/StarterSeedState.swift
+      - path: Workouts/Assets.xcassets
+      - path: Workouts/Resources/ExerciseMotions
+        buildPhase: resources
+      - path: Workouts/Resources/StarterSplits
+        buildPhase: resources
+      - path: "Workouts Mac"
+        excludes:
+          - "Resources/Info-*.plist"
+          - "Resources/*.entitlements"
+      - path: CHANGELOG.md
+        buildPhase: resources
+        type: file
+      - path: LICENSE.md
+        buildPhase: resources
+        type: file
+    dependencies:
+      - package: IndieSync
+      - package: IndieAbout
+    postBuildScripts: *updateBuildInfo
+    settings:
+      base:
+        PRODUCT_BUNDLE_IDENTIFIER: dev.rzen.indie.Workouts
+        PRODUCT_NAME: Workouts
+        INFOPLIST_FILE: "Workouts Mac/Resources/Info-macOS.plist"
+        CODE_SIGN_ENTITLEMENTS: "Workouts Mac/Resources/Workouts-macOS.entitlements"
+        GENERATE_INFOPLIST_FILE: false
+        SWIFT_STRICT_CONCURRENCY: complete
+        MACOSX_DEPLOYMENT_TARGET: "26.0"
+        ASSETCATALOG_COMPILER_APPICON_NAME: AppIcon
+        ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME: AccentColor