Re-enable InMemoryMcpTaskStore when upstream DI scope bug is fixed

[jongalloway]

Context

MCP SDK v1.1.0's ExecuteToolAsTaskAsync disposes the request-scoped IServiceProvider before the background task can resolve services. This causes ObjectDisposedException on every tool call when InMemoryMcpTaskStore is registered.

We've commented out the task store registration as a workaround. The TaskSupport = ToolTaskSupport.Optional attribute is kept on dotnet_project so it's ready to activate.

Upstream

• MCP task will dispose the taskstore which cause invoke tool failed modelcontextprotocol/csharp-sdk#1430: MCP task will dispose the taskstore which cause invoke tool failed

When to re-enable

1. Upstream issue is fixed and a new MCP SDK version is released
2. Uncomment builder.Services.AddSingleton<IMcpTaskStore, InMemoryMcpTaskStore>(); in Program.cs
3. Set AsyncTasks = true in DotNetCliTools.Misc.cs ServerCapabilities
4. Restore the task lifecycle conformance tests in McpConformanceTests.cs
5. Update ServerCapabilitiesTests.cs to assert AsyncTasks == true

Files

• DotNetMcp/Program.cs — commented-out registration
• DotNetMcp/Tools/Cli/DotNetCliTools.Misc.cs — AsyncTasks = false
• DotNetMcp.Tests/Server/McpConformanceTests.cs — task tests replaced with degradation tests
• DotNetMcp.Tests/Server/ServerCapabilitiesTests.cs — asserts AsyncTasks == false