- Use consolidated Finbuckle.MultiTenant namespace instead of separate imports
- Switch TenantProvider to use untyped IMultiTenantContextAccessor (Finbuckle 9.x pattern)
- Register TenantDbConnectionInterceptor and SaveChangesTenantInterceptor as singletons
- Add interceptors to DbContext configuration for RLS tenant context support
- Update evidence files for Task 7 and Task 8 verification