feat: Implement async polling task handler system #12
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- Add BackgroundTaskHandlerConfig for configurable polling, timeouts, retries - Implement BackgroundTaskQueue with pending/active/completed/dead-letter queues - Add DefaultBackgroundTaskHandler with agent integration and iterative processing - Integrate with A2A server builder via with_default_background_task_handler() - Support task lifecycle management (submitted → working → completed/canceled) - Add /tasks endpoints for submission, status checking, and queue statistics - Include comprehensive test coverage and error handling - Support cleanup of completed tasks and dead letter queue management Co-authored-by: Eden Reich <edenreich@users.noreply.github.com>
- Add public methods to Agent for system_prompt, provider, model, and tool_handlers access - Fix A2A Task struct initialization with required metadata field - Convert TaskStatus timestamp to Option<String> format as per A2A spec - Update message conversion functions to handle proper SDK message format - Make Agent struct cloneable by using Arc<dyn ToolHandler> instead of Box - Add Debug implementation for BackgroundTaskQueue - Resolve type mismatches in server endpoint handlers Co-authored-by: Eden Reich <edenreich@users.noreply.github.com>
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Summary
Implements async polling task handler for A2A server with background worker processing, task queuing, cleanup, and agent integration.
Changes
Test Plan
Closes #9
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