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Introduce AGENTS.md (#1059) #572

Job	Run time
Server Conformance	57s
Client Conformance (tools_call)	47s
Client Conformance (sse-retry)	44s
Auth Conformance (auth/pre-registration)	46s
Client Conformance (initialize)	1m 10s
Client Conformance (elicitation-sep1034-client-defaults)	1m 3s
Auth Conformance (auth/metadata-var2)	49s
Auth Conformance (auth/scope-from-www-authenticate)	57s
Auth Conformance (auth/metadata-var1)	43s
Auth Conformance (auth/metadata-default)	46s
Auth Conformance (auth/scope-omitted-when-undefined)	54s
Auth Conformance (auth/token-endpoint-auth-post)	44s
Auth Conformance (auth/token-endpoint-auth-none)	45s
Auth Conformance (auth/metadata-var3)	51s
Auth Conformance (auth/scope-retry-limit)	50s
Auth Conformance (auth/token-endpoint-auth-basic)	54s
Auth Conformance (auth/scope-step-up)	42s
Auth Conformance (auth/basic-cimd)	50s
Auth Conformance (auth/scope-from-scopes-supported)	48s
	16m 0s