Package-level declarations

Installable Velocity endpoint with authenticated proxy/backend routing and an owned UI worker. Backend messages may use only the server route; client proxy actions are never forwarded to a backend.

Public entry point supplied by the installed Strata Velocity plugin. Consumers depend on plugin ID strata; definitions, state, and handlers run on its dedicated UI thread. Calls return immediately. Never join their futures from a screen handler or run blocking work in completion callbacks.