Remove unused Mid MT layer

core/box/hak_wrappers.inc.h

@@ -33,7 +33,6 @@ void* realloc(void* ptr, size_t size) {
 #include "../hakmem_pool.h"            // Mid registry lookup (failsafe for headerless Mid)
 #include "../front/malloc_tiny_fast.h" // Phase 26: Front Gate Unification
 #include "tiny_front_config_box.h"     // Phase 4-Step3: Compile-time config for dead code elimination
-#include "mid_free_route_box.h"        // Phase 5-Step2: Mid MT free routing fix
 
 // malloc wrapper - intercepts system malloc() calls
 __thread uint64_t g_malloc_total_calls = 0;
@@ -226,11 +225,6 @@ void free(void* ptr) {
     }
 #endif
 
-    // Phase 5-Step2: Mid Free Route Box (BEFORE classify_ptr)
-    // Quick fix for 19x free() slowdown: Try Mid MT registry first
-    // If found, route directly to mid_mt_free() and return
-    if (mid_free_route_try(ptr)) return;
-
     // Classify pointer BEFORE early libc fallbacks to avoid misrouting Tiny pointers
     // This is safe: classifier uses header probe and registry; does not allocate.
     int is_hakmem_owned = 0;