PR Summary

Low Risk
Documentation-only change that doesn’t modify runtime behavior; risk is limited to potential confusion if guidance drifts from the set_table_visibility macro behavior.

Overview
Adds new documentation for controlling Dune table public/private visibility via meta.dune.public, including folder-level dbt_project.yml config, incremental model behavior, prod-only application, and a raw ALTER TABLE ... SET PROPERTIES fallback for existing tables.

Links the new docs/dune-table-visibility.md guide from the README documentation index.

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