Updates the RLS knowledge loaded by the dashboard AI assistant to
explain the new secure-by-default functionality.
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## Summary by CodeRabbit
* **Documentation**
* Clarified PostgreSQL/RLS guidance in Studio: tables are now "secure by
default"—SQL-created tables aren’t exposed via the Data API unless
explicit grants are given to anon/authenticated/service_role and RLS is
enabled; added an “Exposing a Table to the Data API” workflow,
strengthened RLS prerequisites in best practices, and improved
troubleshooting/error-recovery guidance.
* **Tests / Evaluations**
* Added an evaluation case validating guidance for non-RLS tables
requiring explicit grants and RLS policies.
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Co-authored-by: Ali Waseem <waseema393@gmail.com>