Ultravox Client SDK for Web

The `ultravox-client` library provides a web client SDK for integrating Ultravox's real-time, speech-to-speech AI capabilities into web applications. Written in TypeScript, it offers an event-driven API for managing interactive voice sessions. The current stable version is 0.5.0, indicating it is still in active development with potential for API changes in future minor releases. It enables developers to join AI-powered calls, listen for session status changes, and receive real-time speech transcripts from both users and AI agents. Key differentiators include its focus on low-latency, real-time voice interaction and its comprehensive event model for managing session state and data flow within a web browser environment, abstracting away the underlying WebSocket complexities.