Do not track the generated Info.plist

xcodegen writes it from project.yml on every generate, so keeping it in git
gives the same facts two homes and a diff every time the yml changes. The
.xcodeproj is ignored for exactly this reason.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.gitignore

@@ -1,5 +1,6 @@
-# Generated by xcodegen from project.yml.
+# Generated by xcodegen from project.yml, which is the source of truth for both.
 *.xcodeproj/
+ios/Resources/Info.plist
 *.xcworkspace/
 DerivedData/
 build/