fix: remove unnecessary cfg(test) attributes from test modules

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

src/lib.rs

@@ -0,0 +1,14 @@
+// Re-export modules for testing
+pub mod common;
+pub mod compression_engine;
+pub mod db;
+pub mod meta_plugin;
+pub mod modes;
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_library_structure() {
+        assert!(true);
+    }
+}