feat: round text_line_mean_len to nearest integer

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

src/meta_plugin/text.rs

@@ -283,9 +283,11 @@ impl TextMetaPlugin {
                     }
                     
                     if output_mean {
+                        // Round to nearest integer
+                        let mean_len_int = mean_len.round() as usize;
                         if let Some(meta_data) = crate::meta_plugin::process_metadata_outputs(
                             "text_line_mean_len", 
-                            mean_len.to_string(), 
+                            mean_len_int.to_string(), 
                             self.base.outputs()
                         ) {
                             log::debug!("TEXT: Adding mean line length metadata: {:?}", meta_data);