* .NET: Update A2A, MCP, and system package dependencies Update dependency versions: - A2A/A2A.AspNetCore: 0.3.3-preview → 0.3.4-preview - ModelContextProtocol: 0.8.0-preview.1 → 1.1.0 - Microsoft.Bcl.AsyncInterfaces: 10.0.3 → 10.0.4 - System.Linq.AsyncEnumerable: 10.0.0 → 10.0.4 - Add Microsoft.Bcl.Memory 10.0.4 Remove internal polyfill extensions now provided by A2A SDK 0.3.4: - A2AMetadataExtensions (source + tests) - AdditionalPropertiesDictionaryExtensions (source + tests) Update DefaultMcpToolHandler to match MCP SDK 1.1.0 API changes where ImageContentBlock.Data and AudioContentBlock.Data changed from string to ReadOnlyMemory<byte>. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * address pr review comments --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
* map additional props from agent run options to a2a request metadata * small touches * add unit tests for new extension methods * Sort using * add unit test * add additiona unit tests * special case json element to avoid unnecessary serialization