Where the runtime's permissions are composed, a runtime carrying the tool
runner subscribes mesh-sdk's EveryEvent (every seat's, module's and module
stream's events) and nothing else for it, replacing the per-family list.
Builds: design 34 every-event §6, §8, §25, §27
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h