Infrastructure and build updates

- Update build configuration and flags
- Add missing header files and dependencies
- Update TLS list implementation with proper scoping
- Fix various compilation warnings and issues
- Update debug ring and tiny allocation infrastructure
- Update benchmark results documentation

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

core/hakmem_tiny_refill.inc.h

@@ -141,6 +141,18 @@ static inline void tiny_debug_validate_node_base(int class_idx, void* node, cons
 
 // Fast cache refill and take operation
 static inline void* tiny_fast_refill_and_take(int class_idx, TinyTLSList* tls) {
+    // Phase 1: C0–C3 prefer headerless array stack (FastCache) for lowest latency
+    if (__builtin_expect(g_fastcache_enable && class_idx <= 3, 1)) {
+        void* fc = fastcache_pop(class_idx);
+        if (fc) {
+            extern unsigned long long g_front_fc_hit[];
+            g_front_fc_hit[class_idx]++;
+            return fc;
+        } else {
+            extern unsigned long long g_front_fc_miss[];
+            g_front_fc_miss[class_idx]++;
+        }
+    }
     void* direct = tiny_fast_pop(class_idx);
     if (direct) return direct;
     uint16_t cap = g_fast_cap[class_idx];
@@ -173,11 +185,16 @@ static inline void* tiny_fast_refill_and_take(int class_idx, TinyTLSList* tls) {
 
     while (node && remaining > 0u) {
         void* next = *(void**)((uint8_t*)node + next_off_tls);
-        if (tiny_fast_push(class_idx, node)) {
-            node = next;
-            remaining--;
+        int pushed = 0;
+        if (__builtin_expect(g_fastcache_enable && class_idx <= 3, 1)) {
+            // Headerless array stack for hottest tiny classes
+            pushed = fastcache_push(class_idx, node);
         } else {
-            // Push failed, return remaining to TLS
+            pushed = tiny_fast_push(class_idx, node);
+        }
+        if (pushed) { node = next; remaining--; }
+        else {
+            // Push failed, return remaining to TLS (preserve order)
             tls_list_bulk_put(tls, node, batch_tail, remaining, class_idx);
             return ret;
         }