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`subscription/listen` without `params` or `notifications` returns error #1069

Job	Run time
Server Conformance	50s
Client Conformance (sse-retry)	1m 11s
Modern Server Conformance (2026-07-28)	58s
Auth Conformance (auth/scope-from-www-authenticate)	57s
Auth Conformance (auth/scope-step-up)	1m 6s
Auth Conformance (auth/basic-cimd)	58s
Auth Conformance (auth/metadata-var2)	1m 16s
Auth Conformance (auth/pre-registration)	1m 21s
Client Conformance (initialize)	40s
Client Conformance (elicitation-sep1034-client-defaults)	45s
Auth Conformance (auth/metadata-var3)	1m 32s
Auth Conformance (auth/token-endpoint-auth-none)	1m 28s
Auth Conformance (auth/scope-retry-limit)	1m 49s
Auth Conformance (auth/scope-omitted-when-undefined)	1m 14s
Auth Conformance (auth/token-endpoint-auth-post)	1m 21s
Auth Conformance (auth/token-endpoint-auth-basic)	1m 8s
Client Conformance (tools_call)	50s
Auth Conformance (auth/scope-from-scopes-supported)	1m 24s
Auth Conformance (auth/metadata-var1)	1m 22s
Auth Conformance (auth/metadata-default)	1m 26s
	23m 36s