Upgrade Flutter Gemma

Upgrade flutter_gemma dependency

Follow these 5 phases sequentially. Do not skip phases. Ask the user before making decisions about new features (Phase 3).

Phase 1: Reconnaissance

1. Run dart pub outdated to identify the available flutter_gemma version
2. Update flutter_gemma version in both:
   • pubspec.yaml
   • example/pubspec.yaml
3. Run flutter pub get
4. Read the new version's CHANGELOG from pub cache:

   find ~/.pub-cache/hosted/pub.dev -maxdepth 1 -name "flutter_gemma-*" | sort
   

   Then read the CHANGELOG.md from the latest version directory.
5. Summarize for the user:
   • Breaking changes (removed/renamed APIs, changed signatures)
   • New APIs (new parameters, methods, enums, classes)
   • Bug fixes
   • Deprecations

Phase 2: Fix Compilation

1. Run dart analyze

2. Fix all compilation errors. These typically appear in:

   Checklist of files that depend on flutter_gemma API:

   • lib/src/flutter_gemma_runtime.dart — FlutterGemma.getActiveModel(), FlutterGemma.getActiveEmbedder() signatures
   • lib/src/flutter_gemma_model.dart — InferenceModel.createChat() signature, ModelResponse pattern matching, InferenceChat methods
   • lib/src/flutter_gemma_embedder.dart — EmbeddingModel.generateEmbeddings() signature, PreferredBackend enum
   • lib/src/converters/request_converter.dart — Message constructors (.withImage, .withAudio, .toolCall, .toolResponse)
   • lib/src/converters/response_converter.dart — ModelResponse subtypes (TextResponse, FunctionCallResponse, ParallelFunctionCallResponse, ThinkingResponse)
   • lib/src/converters/tool_converter.dart — Tool constructor
   • lib/src/flutter_gemma_plugin.dart — ModelType, ModelFileType enums
   • test/src/fake_runtime.dart — FakeInferenceModel, FakeInferenceChat, FakeEmbeddingModel must match upstream abstract class signatures

3. Repeat dart analyze until clean (0 issues)

Phase 3: Support New Features

Based on the CHANGELOG from Phase 1, decide with the user which new APIs to support.

For each new feature, the typical integration points are:

New parameter in createChat() or createSession()

1. Add field to $FlutterGemmaModelOptions in lib/src/flutter_gemma_options.dart
2. Manually update lib/src/flutter_gemma_options.g.dart:
   • Constructor parameter
   • Field declaration with @override
   • fromJson parsing
   • toJson serialization
   • jsonSchema() property entry
3. Extract from config and pass in lib/src/flutter_gemma_model.dart (_executeGeneration)
4. Update FakeInferenceModel.createChat() in test/src/fake_runtime.dart — add parameter, store in last* field for test assertions

New enum value (e.g. ModelFileType)

1. Update comments in lib/src/flutter_gemma_plugin.dart (FlutterGemmaModelConfig.fileType)

New method on InferenceChat or InferenceModel

1. Add override in FakeInferenceChat or FakeInferenceModel in test/src/fake_runtime.dart

Changed model capabilities

1. Update supports map in lib/src/flutter_gemma_plugin.dart (list() method, ~line 123)

Changed message handling

1. Update converters in lib/src/converters/
2. Update extractSystemInstruction() if system message handling changed

IMPORTANT: The .g.dart file is manually maintained (build_runner is broken). Always update it by hand when changing the schema.

Phase 4: Tests and Review

1. Update existing tests that verify old behavior which has changed
2. Add new tests for each new feature integrated in Phase 3
3. Run flutter test — all tests must pass
4. Run /pr-review-toolkit:review-pr for comprehensive review
5. Fix any issues found by the review agents

Phase 5: Finalize

1. Bump version in pubspec.yaml:
   • Minor bump (e.g. 0.1.1 → 0.2.0) if there are breaking behavioral changes
   • Patch bump (e.g. 0.1.1 → 0.1.2) if only bug fixes / non-breaking additions
2. Update CHANGELOG.md — add new version section at the top with:
   • Breaking changes (prefixed with **Breaking**:)
   • New features
   • Bug fixes
3. Update README.md:
   • Options table if new config fields were added
   • Known Limitations section if capabilities changed
   • Quick Start / examples if API usage changed
4. Verify everything:

   dart analyze
   flutter test
   dart pub publish --dry-run
   

   All must pass cleanly.
5. Commit on a feature branch (e.g. feature/flutter-gemma-X.Y.Z)