feat: add PIPESIZE constant for consistent buffer sizes

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

src/meta_plugin/binary.rs

@@ -2,6 +2,7 @@ use anyhow::Result;
 use rusqlite::Connection;
 
 use crate::common::is_binary::is_binary;
+use crate::common::PIPESIZE;
 use crate::meta_plugin::MetaPlugin;
 
 #[derive(Debug, Clone, Default)]
@@ -43,7 +44,7 @@ impl BinaryMetaPlugin {
         
         let max_buffer_size = final_options.get("max_buffer_size")
             .and_then(|v| v.as_u64())
-            .unwrap_or(4096) as usize;
+            .unwrap_or(PIPESIZE as u64 / 2) as usize;
         
         BinaryMetaPlugin {
             meta_name: "binary".to_string(),