Add draft protocol support: sessionless + handshake-less (SEP-2575 + SEP-2567)#1610

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Commits on Jun 6, 2026

Add fallback negotiation, MinProtocolVersion, server-side _meta protocolVersion validation, and raw stream conformance tests

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Add raw HTTP conformance tests + document MCP9005

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Expose DraftProtocolVersion publicly and update stateless concept doc

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