add copying token value and add Boehm GC ready for runtime implimentation

src/memory.c

@@ -0,0 +1,39 @@
+#include "memory.h"
+#include <gc.h>
+#include <string.h>
+#include <stdlib.h> // for malloc/free (temp arena fallback)
+
+static char* temp_arena = NULL;
+static size_t temp_arena_capacity = 0;
+static size_t temp_arena_offset = 0;
+
+#define TEMP_ARENA_INITIAL_CAPACITY 4096
+
+void ar_memory_init() {
+    GC_INIT();
+}
+
+void ar_memory_shutdown() {
+    // No-op for Boehm, but could clean up temp arena here
+    if (temp_arena) {
+        free(temp_arena);
+        temp_arena = NULL;
+        temp_arena_capacity = 0;
+        temp_arena_offset = 0;
+    }
+}
+
+void* ar_alloc(size_t size) {
+    return GC_MALLOC(size);
+}
+
+void* ar_alloc_atomic(size_t size) {
+    return GC_MALLOC_ATOMIC(size);
+}
+
+char* ar_strdup(const char* str) {
+    size_t len = strlen(str) + 1;
+    char* copy = (char*)GC_MALLOC(len);
+    memcpy(copy, str, len);
+    return copy;
+}