v0.0.2 of cupertino_fundations_models

Apple Foundation Models for Flutter with on-device AI, streaming, multimodal prompts, diagnostics, and Private Cloud Compute support. Changelog excerpt: - Marked the package as iOS-only in pubspec.yaml. - Added pub.dev metadata for repository, issues, documentation, topics, and platform support. - Expanded the README with iOS-only support, conversation context, advanced example links, source code links, and the agent skill guide. - Expanded the example README so pub.dev can display a useful Example tab while still linking to example/lib/main.dart. - Removed generated test scaffolding to comply with the repository rule of not creating tests.