Where was this agreed?

#2663

Description

Implement SEP-2663.

• Implement SEP-2663: Tasks Extension typescript-sdk#2189
• SEP-2663: Tasks Extension csharp-sdk#1573
• Implement SEP-2663: Tasks Extension go-sdk#942
• SEP-2663: Tasks Extension java-sdk#1013
• Implement SEP-2663: Tasks Extension kotlin-sdk#817
• [Schema] SEP-2663 Tasks: Task shape, resultType discriminator, tasks/* request/result types php-sdk#345
• [Server] SEP-2663 Tasks: Extension registration, capability negotiation, tasks/* handlers php-sdk#346
• [Server] SEP-2663 Tasks: TaskStoreInterface with InMemory default and DoS limits php-sdk#347
• [Server][Capability] SEP-2663 Tasks: Tool handlers can return task handles; long-running execution model php-sdk#348
• [Server] SEP-2663 Tasks: Pipe server-to-client requests through tasks/update responses (SEP-2260 compliance) php-sdk#349
• Implement SEP-2663: Tasks Extension python-sdk#2806
• SEP-2663: Tasks Extension ruby-sdk#391
• Implement SEP-2663: Tasks Extension rust-sdk#868
• Implement SEP-2663: Tasks Extension swift-sdk#247