Wasm plugins' isolated Postgres role is deliberately denied on core tables, which left no sanctioned path to data_tables/data_table_rows. Adds the datatables.* capability family (get_table_by_key, get_row, list_rows, create_row, update_row_data, find_row_by_field) following the datasources pattern: interface package, ABI proto messages, guest stub, CoreServices wiring, golden round-trip coverage. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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