vantage-rbac-rls-non-negotiable-v1-gate

Strict RBAC with row-level security enforced at query-execution layer is the single v1 must-have for Runwal Vantage. Finance, sales, and project data across 9 functions cannot leak across roles/departments. This is enforced at Snowflake query execution (not application layer), making it the hard gate for any MVP declaration. Missing this == v1 failure regardless of any other capability.