[juliantoledo]

Summary

Part 2 of 5 in the Gemini Live voice assistant series (following #65):

1. PR 1: Refactor tool discovery and execution (refactor(agent): unify AppFunction discovery, input conversion, and execution #65 — merged)
2. PR 2 (this PR): Live LLM provider layer (LiveLlmProvider abstraction + GeminiLiveProviderImpl)
3. PR 3: Full-duplex audio capture/playback (LiveAudioSession + GeminiLiveAudioHelper)
4. PR 4: Live session orchestration (LiveAgentOrchestrator)
5. PR 5: Android VoiceInteractionService and Live UI integration

Changes in this PR

• LiveLlmProvider / LiveLlmSession / LiveLlmEvent: Introduce a provider-agnostic bidirectional streaming abstraction returning LiveLlmSession (with close() and a withSession lifecycle extension), supporting configurable input/output sample rates, input/output transcriptions, turn completion, interruption events, tool call requests/responses, and LiveLlmEvent.Error.
• LlmProviderFactory / LlmProviderFactoryImpl: Extend the provider factory with getLiveProvider(name: LlmProviderName): LiveLlmProvider.
• GeminiLiveProviderImpl & GeminiLiveVoice: Implement Gemini Live over the BidiGenerateContent WebSocket endpoint (models/gemini-3.8-live) using Ktor WebSockets (with pingIntervalMillis configured in DataModule), supporting prebuilt studio voice selection (GeminiLiveVoice persisted in SettingsRepository), realtime PCM audio streaming, input/output audio transcriptions, and tool call/response frames.
• GeminiLiveToolConverter & ToolConverter / JsonExtensions: Add GeminiLiveToolConverter (normalizing OpenAPI schema fields for BidiGenerateContent), provider-agnostic selectDistinctTools, findToolByName, and resolveToolName extensions on ToolConverter, and shared toPrimitive() / toArgumentsMap() JSON helpers in domain/JsonExtensions.kt.
• Unit Tests: Add unit tests in GeminiLiveProviderImplTest, GeminiLiveToolConverterTest, ToolConverterTest, and SettingsRepositoryTest.

Test Plan

• ./gradlew spotlessCheck testStandardDebugUnitTest testRetailDebugUnitTest compileStandardDebugAndroidTestKotlin compileStandardDebugScreenshotTestKotlin

[mingweiliao]

Thanks!