- Implement direct data path assignments compiler parsing and evaluation
- Structuredly accumulate deep nested path maps and include in returned envelope
- Extract and sequentially emit dataModel as an UpdateDataModel message
- Support <a2ui> and </a2ui> sentinel tags for robust, leak-free layout extraction
- Statefully filter DSL lines in real-time streaming chat bubble streams
- Support format-spanning multi-line statements in compiler parsers
- Rethrow programming Error types in handleMessage to prevent LLM debugging loops
- Add comprehensive multi-line and path assignment unit tests

…piler, prompt builder, and local Genkit models

- Create packages/genui_express as a shareable Flutter plugin package.
- Port A2UI Express lexer, token scanner, parser, and catalog schema helper.
- Implement ExpressPromptBuilder extending GenUI's PromptBuilder with compact signature contracts optimized for on-device LLMs.
- Develop GenuiExpressLocalModels registering Apple Intelligence (FoundationModels), Android AI Edge (Gemini Nano), and Ollama HTTP completions directly with Genkit.
- Expose ExpressLocalTransport implementing the core Transport interface to coordinate local streaming and compilation pipelines.
- Add comprehensive compiler parser and transport streaming tests.

…enui_express package

- Delete local hand-rolled express compiler, transport, and custom agent loop files inside examples/express_chat.
- Update express_chat/pubspec.yaml to depend on genui_express and genkit.
- Refactor ChatSession and ChatScreen widgets to accept Genkit engine and ModelRef parameters in place of custom AiClient.
- Convert TextOnlyChatSession and A2uiChatSession to coordinate via ExpressLocalTransport and Genkit.
- Rewrite integration test and fake client to instantiate Genkit models and verify layouts using A2uiMessage subtype pattern casts.
- Verify standard A2UI JSON array envelope resolution under Postel's Law in ExpressLocalTransport.
- Confirm that all smoke and integration tests pass successfully.

…nfigurable

- Update local/http-completion model to read baseUrl and model from Genkit request configuration map.
- Change default completions endpoint to http://localhost:8080/v1 and model name to mlx-community/gemma-4-e2b-it-4bit, matching the monorepo local MLX server.

…ple Intelligence on-device LLM

- Connect genui_express MethodChannel and EventChannel handlers to Swift on macOS and iOS.
- Use NaturalLanguage.LanguageModelSession to stream hardware-accelerated response chunks.
- Support checkAvailability call and handle asynchronous task cancellation.

…enforce compile-safe LanguageModeling imports

- Override MACOSX_DEPLOYMENT_TARGET to 15.0 for all native targets inside CocoaPods post_install block in examples/express_chat/macos/Podfile.
- Increase minimum platform versions to macOS 15.0 and iOS 18.0 in all package podspecs and SPM Package manifests.
- Integrate #if canImport(LanguageModeling) conditional compilation block inside native Apple plugins to bypass module resolution errors on simulated/sandboxed build servers.
- Update examples/express_chat to default to local/apple-foundation-models session in chat_session.dart.

…ons for gMac compatibility

- Default A2uiChatSession and TextOnlyChatSession model reference to local/http-completion in chat_session.dart.
- Remove unused package:genkit/src/core/action.dart import.
- Simplify stream variable definition with type inference.

…ndation-models

- Set default model reference back to local/apple-foundation-models in chat_session.dart for production open-source Apple Silicon Neural Engine deployment.
- Keep dynamic local/http-completion completions model active for local gMac completions testing.

…ocal developer testing

- Default A2uiChatSession and TextOnlyChatSession model reference back to local/http-completion in chat_session.dart, enabling plug-and-play local gMac completions.
- Keep Swift plugins clean and Sequoia-compliant.

…conditional imports for Chrome built-in AI

- Add genkit_chrome dependency to packages/genui_express.
- Implement on_device_plugins_stub.dart and on_device_plugins_web.dart to isolate web-only js_interop imports.
- Conditionally register ChromeAIPlugin on Genkit when compiling for web.
- Use kIsWeb in examples/express_chat to dynamically default to 'chrome/gemini-nano' on Chrome and 'local/http-completion' on native platforms.

…ore required web plugin registrant

- Restore required packages/genui_express/lib/genui_express_web.dart to resolve web compilation entrypoint registrant error.
- Remove package genkit_chrome from packages/genui_express dependencies and add it to examples/express_chat dependencies.
- Implement chrome_plugin_stub.dart and chrome_plugin_web.dart in examples/express_chat using package:genkit/plugin.dart.
- Pass getPlatformPlugins() conditionally to the Genkit constructor list inside chat_session.dart.
- Clean up packages/genui_express plugin stubs.

…xample

- Exclude web-only files (*_web.dart) from ephemeral coverage test generation in test_and_fix.dart to prevent VM compilation errors.
- Replace genui_express/README.md with a detailed package description, usage instructions, and a concrete implementation code sample.

…odel constants

- Restricted public library exports in `genui_express.dart` to strictly keep tokenizer, parsing, and schema helper internals hidden.
- Defined public static const string references for local model names (`appleFoundationModels`, `androidAiEdge`, `httpCompletion`) inside `GenuiExpressLocalModels`.
- Updated the local models registration logic to use these public constants.
- Refactored model instantiation in `chat_session.dart` (express_chat example) to leverage the new type-safe model constants.
- Updated imports in `compiler_test.dart` to directly reference compiler internals package-relatively.

- Exclude all `*_web.dart` files (e.g., `genui_express_web.dart`, `chrome_plugin_web.dart`) in `test_and_fix.dart` from being imported in the autogenerated `ephemeral_coverage_all_test.dart` file.
- This prevents compiler crashes on native VM test environments caused by missing `dart:ui_web` and `dart:js_interop` libraries.
- Updated `coverage_policy.yaml` to globally exclude `**/*_web.dart` and set explicit policies for the new packages (genui_express threshold of 60% and disabled express_chat).
- Updated `coverage_baseline.yaml` high-water marks.

…example

- Enabled coverage verification for `examples/express_chat` in `coverage_policy.yaml` with a threshold of 30.0%.
- Updated `coverage_baseline.yaml` to record its high-water mark (35.8%).

…ample

- Enabled coverage verification for `examples/simple_chat` in `coverage_policy.yaml` with a threshold of 30.0%.
- Updated `coverage_baseline.yaml` to record its high-water mark (37.3%).
- Note: examples/verdure/client remains disabled since it does not contain a 'test/' directory.