Function execute_public_read 

pub fn execute_public_read(
    conn: &ReadConn,
    statements: &[SqlStatementRequest],
    single: bool,
    consistency: PublicReadConsistency,
    session_cursor: Option<u64>,
    committed_cursor: impl FnOnce() -> Result<u64, String>,
    served_by: &str,
) -> (u16, Value)

Execute the shared public read path on a host-owned read connection. The host supplies its current committed cursor lookup; connection ownership stays outside.