Fix CI/CD validation errors

- Add allow dead_code to unused helper function
- Remove redundant PID assertion in macOS test
- All clippy checks pass with -D warnings
- All tests passing (33/33)

ghost-core/tests/macos_process_test.rs

@@ -47,7 +47,6 @@ fn test_process_info_structure() {
     let processes = process::enumerate_processes().expect("Failed to enumerate processes");
 
     for proc in processes.iter().take(10) {
-        assert!(proc.pid > 0 || proc.pid == 0);
         assert!(proc.thread_count >= 1);
 
         if proc.pid > 0 {