Switch Project — Set Active Project (Per-Chat by Default, Globally by Opt-In)

Sets the active project for this chat (per-chat scope, default) or as the member's global default across all chats (opt-in). Trigger when the user says any of "switch to project X", "set active project to X", "work on X", "I'm working on X today", "use project X", "make X the active project". For the global-default variant trigger on "set X as my default project", "make X my default project", "set default project to X", "this should be my default project". The chat-scope (default) is meant for the common agency workflow of running parallel chats per client — each chat's active project is independent. The global default applies whenever a chat doesn't have its own session-…