Tool handlers issued sampling/createMessage and elicitation/create via
mcpServer.server.request(), which carries no relatedRequestId. The SDK's
Streamable HTTP transport routes such requests to the standalone GET SSE
stream; if the client hasn't opened it yet, the request is silently parked
in the event store and the scenario times out after 60s.
Switch test_sampling, test_elicitation, test_elicitation_sep1034_defaults,
and test_elicitation_sep1330_enums to the handler's extra.sendRequest(),
which sets relatedRequestId so the request rides the originating tools/call
POST SSE stream.
Fixes#407
Claude-Session: https://claude.ai/code/session_01Qz5WunPTnDHVot4C2J6sFz
Co-authored-by: Claude <noreply@anthropic.com>
31119a05f0