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Add fallible prepared_schema and prepared_column_logical_type accessors so callers can describe result columns without running the statement. Arrow metadata uses DuckDB logical types, original names, and current connection conversion options; unresolved parameter types and unsupported Arrow types return errors.
Coverage verifies sequence and DML side effects remain untouched, INSERT/UPDATE/DELETE/MERGE RETURNING, Decimal(38,12), UUID conversion settings, lists, timestamps, and parameter binding. All 304 duckdb library tests pass with DuckDB 1.5.5 and Arrow 58.