fix: re-export PIPESIZE from lib.rs

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/lib.rs

@@ -11,6 +11,8 @@ pub mod args;
 
 // Re-export Args struct for library usage
 pub use args::Args;
+// Re-export PIPESIZE constant
+pub use common::PIPESIZE;
 
 #[cfg(test)]
 mod tests;