Where was this agreed?

#2243

Description

Implement SEP-2243.

• Implement SEP-2243: HTTP Standardization typescript-sdk#2190
• SEP-2243: HTTP Standardization csharp-sdk#1541
• Implement SEP-2243 HTTP Standardization go-sdk#905
• SEP-2243: Send required Mcp-Method/Mcp-Name HTTP headers java-sdk#990
• SEP-2243: Send required Mcp-Method/Mcp-Name HTTP headers kotlin-sdk#787
• [Server][Client][Transport] SEP-2243: Emit Mcp-Method and Mcp-Name HTTP headers php-sdk#353
• SEP-2243: Send required Mcp-Method/Mcp-Name HTTP headers python-sdk#2715
• SEP-2243: Send required Mcp-Method/Mcp-Name HTTP headers ruby-sdk#366
• Implement SEP-2243: HTTP Standardization rust-sdk#872
• SEP-2243: Send required Mcp-Method/Mcp-Name HTTP headers swift-sdk#228