Pipeline behaviors applied to every command and query execution.

Behaviors are invoked in declared order. Each behavior receives the request and a next() function; returning without calling next() short-circuits the pipeline (the handler and later behaviors do not run).

An entry is either a behavior instance or a factory that builds one from the service registry. At the onInit phase the WHOLE list is resolved in declared order and installed on both buses, so a mixed list runs in declared order — not instances-then-factories.

Default: [] (no behaviors).