The subscription's key resolves through mesh-sdk's buscompose.EventSubjects (lead answer A-153; the sdk commit EE-S1 is
cherry-picked into this change's sdk placement), a wildcard is refused.
Builds: design 47 G §559, §488, §576, §622
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h