kitchen: README + MISSIONS/engine-c keep-drop notes

engine-c/src/demo_unitcard.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "unit_card.h"
+
+int main() {
+    printf("=== openkknd - Demo Game ===\n");
+    printf("KKND-style RTS Game Engine\n");
+    printf("Version 1.0.0\n");
+    printf("\n");
+    
+    // Create unit registry
+    UnitRegistry* registry = create_registry();
+    
+    // Test unit creation
+    UnitCard* marine = create_unit_card(
+        "Terran Marine", "Allied", 100, 100, 15,
+        12, 4, 6, "Standard Terran infantry",
+        "assets/units/marine.png", UNIT_INFANTRY
+    );
+    
+    if (marine) {
+        printf("✓ Created unit: %s (%s)\n", marine->name, marine->faction);
+        printf("  Cost: %d, HP: %d, Attack: %d, Defense: %d, Speed: %d, Range: %d\n",
+               marine->cost, marine->hp, marine->attack, marine->defense,
+               marine->speed, marine->range);
+    }
+    
+    // Test unit addition
+    if (add_unit(registry, marine) == 0) {
+        printf("✓ Unit added to registry\n");
+        
+        // Print registry statistics
+        print_performance_stats(registry);
+        
+        // Test unit lookup
+        UnitCard* found = get_unit_by_name(registry, "Terran Marine");
+        if (found) {
+            printf("✓ Unit lookup successful: %s\n", found->name);
+        }
+        
+        // Clean up
+        destroy_registry(registry);
+        free_unit_card(marine);
+        
+        printf("\n✓ Demo game completed successfully!\n");
+        return 0;
+    }
+    
+    printf("\n✗ Demo game failed\n");
+    destroy_registry(registry);
+    if (marine) free_unit_card(marine);
+    
+    return 1;
+}