chore: remove decimal format

cli/src/args.rs

@@ -67,8 +67,6 @@ pub enum OutputFormat {
     /// Octal output (fixed typo)
     Octal,
     /// Decimal output
-    Decimal,
-    /// Hexadecimal output
     #[default]
     Hex,
     /// Text output (ASCII)

cli/src/main.rs

@@ -19,7 +19,6 @@ fn main() -> anyhow::Result<()> {
             match output_format.unwrap_or_default() {
                 OutputFormat::Binary => println!("{plaintext:064b}"),
                 OutputFormat::Octal => println!("{plaintext:022o}"),
-                OutputFormat::Decimal => println!("{plaintext}"),
                 OutputFormat::Hex => println!("{plaintext:016X}"),
                 OutputFormat::Text => println!("{plaintext}"),
             }