Roster composer writes keep their app_edit / snippets gate and require
workspace agent.manage in addition, instead of replacing it. Generic app
management routes (update/delete/copy/export/name/icon/site/site-enable/
api-enable/api-keys) enforce agent.manage when the target is a roster
Agent App and reject hidden workflow-only backing apps outright, which
stay usable only through the Agent runtime surfaces. Importing an Agent
DSL requires agent.manage and the denial surfaces as 403 instead of a
generic failed import.