fix: Correct module paths and conditional compilation for magic feature

Co-authored-by: aider (openai/andrew/openrouter/sonoma-sky-alpha) <aider@aider.chat>

src/lib.rs

@@ -29,7 +29,9 @@ use filter_plugin::{
 // Import all meta plugins to ensure they register themselves
 #[allow(unused_imports)]
 use meta_plugin::{
-    magic_file, cwd, text, user, shell, shell_pid, keep_pid, digest, 
+    #[cfg(feature = "magic")]
+    magic_file,
+    cwd, text, user, shell, shell_pid, keep_pid, digest, 
     read_time, read_rate, hostname, exec, env
 };