docs: add AGENT.md and update compression engine module

src/compression_engine/mod.rs

@@ -3,6 +3,7 @@ use std::io;
 use std::io::{Read, Write};
 use std::path::PathBuf;
 use strum::IntoEnumIterator;
+use strum_macros::{Display, EnumString, EnumIter};
 
 use log::*;
 
@@ -31,7 +32,7 @@ use crate::compression_engine::program::CompressionEngineProgram;
 /// use keep::compression_engine::CompressionType;
 /// assert_eq!(CompressionType::GZip.to_string(), "gzip");
 /// ```
-#[derive(Debug, Eq, PartialEq, Clone, strum::EnumIter, strum::Display, strum::EnumString, Enum)]
+#[derive(Debug, Eq, PartialEq, Clone, EnumIter, Display, EnumString, enum_map::Enum)]
 #[strum(ascii_case_insensitive)]
 pub enum CompressionType {
     LZ4,
@@ -55,7 +56,7 @@ pub enum CompressionType {
 ///
 /// # Examples
 ///
-/// ```
+/// ```ignore
 /// // Example usage would depend on a concrete implementation
 /// use keep::compression_engine::CompressionEngine;
 /// let engine = /* some engine */;
@@ -80,7 +81,7 @@ pub trait CompressionEngine: Send + Sync {
     /// Returns an error if the file does not exist, is not a valid compressed file,
     /// or if decompression fails.
     fn open(&self, file_path: PathBuf) -> Result<Box<dyn Read>>;
-    
+
     /// Creates a new compressed file for writing.
     ///
     /// Creates a writer that transparently compresses data as it is written.
@@ -218,6 +219,6 @@ pub fn get_compression_engine(ct: CompressionType) -> Result<Box<dyn Compression
     if engine.is_supported() {
         Ok(engine.clone())
     } else {
-        Err(anyhow!("Compression engine for {} is not supported", ct))
+        Err(anyhow!("Compression engine for {} is not supported", ct.to_string()))
     }
-}
+}