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.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -0,0 +1,24 @@
+{
+  "originHash" : "9d613082dd8a405ef810326218a4d81fdfd9ecb33be867afbc9700e52ec96e4b",
+  "pins" : [
+    {
+      "identity" : "indie-about",
+      "kind" : "remoteSourceControl",
+      "location" : "https://git.rzen.dev/rzen/indie-about",
+      "state" : {
+        "branch" : "main",
+        "revision" : "ed73ffcc5488b37ec0838ecaaa27ce050807093f"
+      }
+    },
+    {
+      "identity" : "yams",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/jpsim/Yams",
+      "state" : {
+        "revision" : "51b5127c7fb6ffac106ad6d199aaa33c5024895f",
+        "version" : "6.2.0"
+      }
+    }
+  ],
+  "version" : 3
+}