feat!: enforce required MCP spec fields in McpSchema; lenient wire deserialization #348

Job	Run time
Server Conformance	55s
Client Conformance (elicitation-sep1034-client-defaults)	46s
Client Conformance (sse-retry)	39s
Client Conformance (initialize)	40s
Client Conformance (tools_call)	46s
Auth Conformance (auth/scope-from-www-authenticate)	42s
Auth Conformance (auth/metadata-var2)	47s
Auth Conformance (auth/token-endpoint-auth-post)	46s
Auth Conformance (auth/metadata-default)	43s
Auth Conformance (auth/metadata-var1)	42s
Auth Conformance (auth/scope-omitted-when-undefined)	47s
Auth Conformance (auth/basic-cimd)	48s
Auth Conformance (auth/pre-registration)	49s
Auth Conformance (auth/scope-from-scopes-supported)	41s
Auth Conformance (auth/scope-step-up)	41s
Auth Conformance (auth/token-endpoint-auth-none)	46s
Auth Conformance (auth/token-endpoint-auth-basic)	44s
Auth Conformance (auth/scope-retry-limit)	48s
Auth Conformance (auth/metadata-var3)	40s
	14m 10s

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