Add a non-blocking runtime publish path and switch hot-path publishers to it.
Enforce subscription timeout boundaries, keep ordered subscriber snapshots up to date on subscribe changes, expose all runtime kinds to process hooks, add safe log attrs for non-agent events, and close the gateway message bus on full shutdown.
Emit gateway.start, gateway.ready, and gateway.shutdown on the shared runtime event bus, while keeping reload events on the same helper path.
Update subturn architecture docs to refer to runtime event kinds instead of the removed agent EventBus names.
Validation: GOCACHE=/tmp/picoclaw-go-cache go test ./pkg/gateway ./pkg/events; GOCACHE=/tmp/picoclaw-go-cache go test ./pkg/bus ./pkg/channels ./pkg/mcp ./pkg/tools/integration ./pkg/events ./pkg/gateway; make lint
Hoshina