LLM flexibility, Agent Mode improvements, and new agentic experiences in Android Studio Otter 3 Feature Drop

Android Studio Otter 3 Feature Drop introduces major AI-powered development enhancements. Key updates include the ability to use custom LLMs (OpenAI, Claude, local models, or Gemini API), improved Agent Mode with device interaction and change tracking across multiple conversation threads, natural language UI testing through Journeys, remote MCP server integration for external tools like Figma, AI-assisted Compose UI development from design mocks to debugging, an App Links Assistant for deep link automation, automatic Logcat retracing for R8-optimized code, and a Fused Library plugin for publishing multiple Android libraries as one AAR.