/background (/bg, /btw) exists to start independent work while the current
turn keeps running. Typed while the agent was busy it went into
_pending_input like ordinary input, and process_loop is blocked inside
self.chat() for the whole run, so the background task only started once the
foreground turn had finished. That is the one moment it was not needed.
/steer had the identical problem and was fixed the same way, by dispatching
inline on the UI thread. The command's own CommandDef already declares
busy_policy="dispatch"; the gateway honours that, the classic CLI never
consulted it.
The foreground turn is untouched: no interrupt, no steer, and ordinary
non-slash input keeps following the configured busy-input behaviour.
MaxFreedomPollard