feat: Make bzip2 compression optional

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

src/compression_engine.rs

@@ -76,10 +76,13 @@ lazy_static! {
     pub static ref COMPRESSION_PROGRAMS: EnumMap<CompressionType, Option<CompressionEngineProgram>> = enum_map! {
         CompressionType::LZ4 => None,
         CompressionType::GZip => None,
+        #[cfg(feature = "bzip2")]
         CompressionType::BZip2 => {
             let program = CompressionEngineProgram::new("bzip2", vec!["-qcf"], vec!["-dcf"]);
             if program.supported { Some(program) } else { None }
         },
+        #[cfg(not(feature = "bzip2"))]
+        CompressionType::BZip2 => None,
         CompressionType::XZ => {
             let program = CompressionEngineProgram::new("xz", vec!["-qcf"], vec!["-dcf"]);
             if program.supported { Some(program) } else { None }