rbac-rls-must-enforce-at-query-execution-not-ui

Row-level security for Runwal Vantage (R-Same) must be enforced at the query-execution layer — not just in the UI layer — to prevent Sales, Finance, and Project data from leaking across functions. This is the single non-negotiable v1 requirement: a UI-only RLS that can be bypassed via API calls is not acceptable for internal enterprise data.