engine-c: arid KKND2-like showcase shot + kitchen claim DONE

engine-c/include/unit_card.h

@@ -2,7 +2,7 @@
 // Header file for unit card implementation
 
 #include <stdint.h>
-#include <immintrin.h>
+#include <stddef.h>
 
 typedef struct {
     char name[32];
@@ -33,8 +33,8 @@ typedef struct {
 #define UNIT_SPECIAL 3
 #define UNIT_ALL 0
 
-// Flag for SIMD instructions
-#define HAVE_AVX2 1
+/* Scalar batch helpers in unit_card.c; no AVX2 dependency. */
+#define HAVE_AVX2 0
 
 #ifdef __cplusplus
 extern "C" {