Key changes

1. Realtime agents are now available. Note that this is in Beta and may have bugs, please report them!
2. Support for structuredContent in MCP tool results.

What's Changed

• Realtime: use SDK types for all messages by @rm-openai in #1134
• Realtime: introduce a demo without a UI by @rm-openai in #1135
• Realtime: handoffs by @rm-openai in #1139
• Realtime: move demo audio to separate thread by @rm-openai in #1141
• MCP: add support for tool_result.structuredContent by @rm-openai in #1150
• Correct error message for invalid output types with strict JSON schema by @DanielHashmi in #1101
• Add Streaming of Function Call Arguments to Chat Completions by @devtalker in #999
• Empty mcp tool result error by @thoo in #1142
• Unbreak tests by @rm-openai in #1157
• Realtime: web demo by @rm-openai in #1149
• Realtime docs by @rm-openai in #1153
• v0.2.1 by @rm-openai in #1151

Full Changelog: v0.2.0...v0.2.1