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- Add and() + lt() imports from @groombook/db - Apply businessId to conversation WHERE clause for cross-tenant isolation (GET /portal/conversation: clientId AND businessId both scoped) - Fix cursor pagination: apply lt(messages.createdAt, cursorMsg.createdAt) to the cursor WHERE clause so pages actually paginate - Add UAT_PLAYBOOK.md §4.9.1 Communication tab test cases: TC-APP-4.9.6 message history with conversation TC-APP-4.9.7 empty state (no conversation yet) TC-APP-4.9.8 composer disabled with tooltip TC-APP-4.9.9 cross-tenant isolation Co-Authored-By: Paperclip <noreply@paperclip.ing>