ENV Cleanup Step 2a: Gate debug code in hakmem_tiny_slow.inc

Gate tiny_alloc_dump_tls_state() call and getenv debug code on slow path
failure with HAKMEM_BUILD_RELEASE guard.

Performance: 30.5M ops/s (baseline: 30.2M)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

core/hakmem_tiny_slow.inc

@@ -75,6 +75,7 @@ static void* __attribute__((cold, noinline)) hak_tiny_alloc_slow(size_t size, in
         HAK_RET_ALLOC(class_idx, ss_ptr);
     }
 
+#if !HAKMEM_BUILD_RELEASE
     tiny_alloc_dump_tls_state(class_idx, "slow_fail", &g_tls_slabs[class_idx]);
     // Optional one-shot debug when final slow path fails
     static int g_alloc_dbg = -1; if (__builtin_expect(g_alloc_dbg == -1, 0)) { const char* e=getenv("HAKMEM_TINY_ALLOC_DEBUG"); g_alloc_dbg = (e && atoi(e)!=0)?1:0; }
@@ -84,6 +85,7 @@ static void* __attribute__((cold, noinline)) hak_tiny_alloc_slow(size_t size, in
             fprintf(stderr, "[ALLOC-SLOW] hak_tiny_alloc_superslab returned NULL class=%d size=%zu\n", class_idx, size);
         }
     }
+#endif
 
     return ss_ptr;
 }