Delthin/dsh-plugins#fast

Switch sessions between Standard and Fast tiers via the model selector or `/fast` command, attaching the `priority` tier to eligible Responses requests and forwarding them to the target endpoint when Fast is enabled. Interactive sessions can toggle tiers on the fly while team roles lock in their tier at launch; once Fast is active alongside required configuration and upstream support, requests are routed with `priority`, with actual speed and billing governed by your provider. It needs provider, source and target URLs filled in; it then runs a loopback proxy that sends matching requests, with their authorization header, to the target URL.