fix: Clone the compression type before using it as an index

Co-authored-by: aider (openai/andrew/openrouter/sonoma-sky-alpha) <aider@aider.chat>

src/compression_engine.rs

@@ -139,7 +139,7 @@ pub fn get_compression_engine(
         CompressionType::None => Ok(Box::new(CompressionEngineNone::new())),
         compression_type => {
             let ct = compression_type.clone();
-            if let Some(engine) = COMPRESSION_PROGRAMS[ct].clone() {
+            if let Some(engine) = COMPRESSION_PROGRAMS[ct.clone()].clone() {
                 Ok(Box::new(engine))
             } else {
                 Err(anyhow!("Compression type {:?} not supported", ct))