fix: resolve import issues for Args and ProgramWriter in tests

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/lib.rs

@@ -4,6 +4,11 @@ pub mod compression_engine;
 pub mod db;
 pub mod meta_plugin;
 pub mod modes;
+pub mod plugins;
+pub mod args;
+
+// Re-export Args struct for library usage
+pub use args::Args;
 
 #[cfg(test)]
 mod tests {