chore: gitignore Xcode/Swift files to keep template clean

Prevents app source code, Xcode projects, and asset catalogs from
being accidentally committed to this workflow template repo.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -1,12 +1,29 @@
+# Chat history & environment
 .chat-history/
 .env
+
+# Dependencies
 node_modules/
+
+# macOS
 .DS_Store
+
+# Claude Code local settings
+.claude/settings.json
+.claude/settings.local.json
+
+# Xcode — prevent app code from being committed to this template repo
+*.xcodeproj/
+*.xcworkspace/
 *.xcuserstate
 xcuserdata/
 .build/
 DerivedData/
-.claude/settings.json
-.claude/settings.local.json
-*.xcodeproj/xcuserdata/
-*.xcodeproj/project.xcworkspace/xcuserdata/
+
+# Swift/App source — this is a template repo, not an app
+*.swift
+*.xcassets/
+*.xcstrings
+*.xcprivacy
+*.caf
+project.yml