Implements the same API as the "Request" objects created by Continuity::Adapt::HttpDaemon and other adapters. These faked request objects go over the request queue but instead of containing a request from a user, they contain a request from another part of the system.
Use Continuity::Mapper instead.
One Inspector instance can be reused but can only on one context at a time or else the locking stuff will probably go all breaky.
It's a bit silly that this is here but having it here helps with locking. Continuity::Mapper has a bit nicer interface to the same thing.