Fixed #

• analyzeFile copied nothing before hopping onto a Swift Task, so the Dart-owned input buffers were read after Dart freed them. This made analyzeFile fail with NSCocoaErrorDomain 3840 ("The data couldn't be read...") in Flutter apps (#1).
• assetInventoryStatus and ensureAssetsInstalled now copy their JSON input the same way, so the native side no longer depends on when Dart frees the buffers. Dart already keeps those allocations until the callback; this is defensive hardening, not the Flutter analyzeFile failure.
• analyzePcm and analyzePcmStream now copy their JSON pointer inputs before the Swift Task the same way. pcmBytes was already copied synchronously.

First pub.flutter-io.cn release: native Dart bindings for Apple Speech (SpeechAnalyzer pipeline) on macOS via Dart Build Hooks and FFI.

Added #

• SpeechKit façade — speech and microphone permission status/requests; AssetInventory status and ensureAssetsInstalled; bestAvailableAudioFormat; analyzeFile / analyzePcm / analyzePcmStream with optional AnalysisContext and SpeechAnalyzerOptions; SpeechAnalysisSession with TranscriptionSegment streaming; endSpeechModelRetention.
• Custom language model — exportCustomLanguageModelData (phrase counts, custom pronunciations, optional PhraseCountsFromTemplatesConfig), prepareCustomLanguageModel, supportedCustomLanguagePhonemes, SpeechLanguageModelPaths for dictation.
• Repository layout — lib/, test/, native/ Swift bridge, architecture rule .cursor/rules/architecture-ddd-layered.mdc, and doc/domain-model.md.
• Example package (example/) — CLI samples: permission_status, asset_inventory, best_audio_format (with --install to fetch on-device models when needed), supported_phonemes, export_custom_lm, end_model_retention, analyze_file (optional --bias, --task-priority, --model-retention); shared lib/example_common.dart; example/README.md with overview table and tree-style layout.

Changed #

• Static analysis aligned with screen-capture-kit (all_lint_rules.yaml + shared analysis_options.yaml pattern; drop package:lints).
• Documentation — README (structure aligned with screen-capture-kit), CONTRIBUTING.md, and doc/domain-model.md updated for the implemented API and macOS-only native path.
• pubspec.yaml — platforms limited to macOS until iOS FFI is supported.