Architecture: Items = Zoho Procurement_Items custom module (Stage = Spec → Bid → Level → FL-Validate → Recommend → 5 terminal states). Vendors = Zoho Accounts, linked via the Linked Vendors related list. Activities = notes/tasks on the Procurement_Items record.
Demo Mode: Buttons render the prompts that would be sent to Zoho, but no API calls fire — a server-side proxy is required for production use. Backend wire-up is the Phase 0.5 webapp decision (gated to 06/21/26 Phase 1 validation checkpoint).