Restore C7 Warm/TLS carve for release and add policy scaffolding

core/box/tiny_class_stats_box.c

@@ -0,0 +1,10 @@
+// tiny_class_stats_box.c - Thread-local stats storage for Tiny classes
+
+#include "tiny_class_stats_box.h"
+#include <string.h>
+
+__thread TinyClassStatsThread g_tiny_class_stats = {0};
+
+void tiny_class_stats_reset_thread(void) {
+    memset(&g_tiny_class_stats, 0, sizeof(g_tiny_class_stats));
+}