Switch Brand

Switch the active brand profile for multi-client and agency work by running setup.py --switch-brand, after listing configured brands with the active one starred; confirms the new brand's industry, business model, and primary channel so subsequent outputs use its voice and compliance rules. Triggers on "/digital-marketing-pro:switch-brand", "switch to the other client", "change brand to Acme", "list available brands", "what brands do I have set up". Can present a side-by-side comparison of two brand profiles on request; offers /digital-marketing-pro:brand-setup when the brand isn't found; pairs with /digital-marketing-pro:status to verify the active context.