feat(core): auto-negotiation fallback and custom protocol array support#396
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Description
This PR implements full auto-negotiation fallback support for the SDK as per SEP-2575 (Stateless MCP).
-32004error during connection initialization, the SDK correctly strips the headers and falls back chronologically.[Protocol.MCP_v20251125, Protocol.MCP_DRAFT]) when initializing the client. The SDK will intersect these with the server's capabilities and strictly negotiate them in a newest-to-oldest order.This PR no longer contains the dual-server integration test infrastructure, which has been extracted to a separate PR to maintain clean history.