create_workspace gives the coordinator a way to start a workspace with its shared context, and the tool list is shared, so a new id can be used by create_bot or add_bot_to_workspace in the same reply.
A coordinator's tasks now get create_workspace and update_workspace too: the research task that had the material could only report it, never write it into the workspace, so the coordinator promised an update it had no turn to make.
A workspace created from chat is pushed as server:workspace-created, from the tool and from the live relay, so the rail shows it without a reload.