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

.claude/settings.local.json

@@ -0,0 +1,18 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(mkdir:*)",
+      "Bash(find:*)",
+      "Bash(xargs cat:*)",
+      "WebFetch(domain:git.rzen.dev)",
+      "Bash(xcodebuild:*)",
+      "Bash(xcrun simctl boot:*)",
+      "Bash(xcrun simctl install:*)",
+      "Bash(xcrun simctl launch:*)",
+      "Bash(xcrun simctl get_app_container:*)",
+      "Bash(log show:*)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}