New tool search_flights_streaming: schema is registered on the middleware
config and emitted at TOOL_CALL_START. As the LLM streams flight data
as tool args, the middleware partial-parses and emits dataModelUpdate
progressively — flight cards appear one by one.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds a data-bound declarative UI tool (search_flights) demonstrating the
full A2UI lifecycle: surfaceUpdate → dataModelUpdate → beginRendering.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>