Function execute_recursive_value 

pub async fn execute_recursive_value(
    cte_name: &str,
    columns: &[String],
    init_exprs: &[String],
    step_exprs: &[String],
    condition: Option<&str>,
    max_depth: usize,
    distinct: bool,
) -> Result<QueryResult, LiteError>

Iterative expression evaluation for value-generating recursive CTEs.

Evaluates init_exprs once to produce the anchor row, then iterates: bind the previous row as column variables, evaluate condition (stop when false), evaluate step_exprs to get the next row. Stops at max_depth iterations (returns a typed error when exceeded) or when condition is false. Deduplicates if distinct is true.