Cleanup: Wrap shared_pool debug fprintf in #if !HAKMEM_BUILD_RELEASE

- Lock stats (P0 instrumentation): ~10 fprintf wrapped
- Stage stats (S1/S2/S3 breakdown): ~8 fprintf wrapped
- Release build now has no-op stubs for stats init functions
- Data collection APIs kept for learning layer compatibility

core/hakmem_shared_pool.c

@@ -14,8 +14,9 @@
 #include <sys/mman.h>  // For mmap/munmap (used in shared_pool_ensure_capacity_unlocked)
 
 // ============================================================================
-// P0 Lock Contention Instrumentation
+// P0 Lock Contention Instrumentation (Debug build only)
 // ============================================================================
+#if !HAKMEM_BUILD_RELEASE
 static _Atomic uint64_t g_lock_acquire_count = 0;      // Total lock acquisitions
 static _Atomic uint64_t g_lock_release_count = 0;      // Total lock releases
 static _Atomic uint64_t g_lock_acquire_slab_count = 0; // Locks from acquire_slab path
@@ -54,6 +55,10 @@ static void __attribute__((destructor)) lock_stats_report(void) {
     fprintf(stderr, "===================================\n");
     fflush(stderr);
 }
+#else
+// Release build: No-op stubs
+static inline void lock_stats_init(void) {}
+#endif
 
 // ============================================================================
 // SP Acquire Stage Statistics (Stage1/2/3 breakdown)
@@ -63,6 +68,8 @@ static _Atomic uint64_t g_sp_stage2_hits[TINY_NUM_CLASSES_SS];
 static _Atomic uint64_t g_sp_stage3_hits[TINY_NUM_CLASSES_SS];
 // Data collection gate (0=off, 1=on). 学習層からも有効化される。
 static int g_sp_stage_stats_enabled = 0;
+
+#if !HAKMEM_BUILD_RELEASE
 // Logging gate for destructor（ENV: HAKMEM_SHARED_POOL_STAGE_STATS）
 static int g_sp_stage_stats_log_enabled = -1;  // -1=uninitialized, 0=off, 1=on
 
@@ -85,10 +92,10 @@ static void __attribute__((destructor)) sp_stage_stats_report(void) {
     fprintf(stderr, "\n=== SHARED POOL STAGE STATISTICS ===\n");
     fprintf(stderr, "Per-class acquire_slab() stage hits (Stage1=EMPTY, Stage2=UNUSED, Stage3=new SS)\n");
 
-	    for (int cls = 0; cls < TINY_NUM_CLASSES_SS; cls++) {
+    for (int cls = 0; cls < TINY_NUM_CLASSES_SS; cls++) {
-	        uint64_t s1 = atomic_load(&g_sp_stage1_hits[cls]);
+        uint64_t s1 = atomic_load(&g_sp_stage1_hits[cls]);
-	        uint64_t s2 = atomic_load(&g_sp_stage2_hits[cls]);
+        uint64_t s2 = atomic_load(&g_sp_stage2_hits[cls]);
-	        uint64_t s3 = atomic_load(&g_sp_stage3_hits[cls]);
+        uint64_t s3 = atomic_load(&g_sp_stage3_hits[cls]);
         uint64_t total = s1 + s2 + s3;
         if (total == 0) continue;  // Skip unused classes
 
@@ -104,9 +111,13 @@ static void __attribute__((destructor)) sp_stage_stats_report(void) {
                 (unsigned long long)s2, p2,
                 (unsigned long long)s3, p3);
     }
-	    fprintf(stderr, "====================================\n");
+    fprintf(stderr, "====================================\n");
-	    fflush(stderr);
+    fflush(stderr);
-	}
+}
+#else
+// Release build: No-op stubs
+static inline void sp_stage_stats_init(void) {}
+#endif
 
 // Snapshot Tiny-related backend metrics for learner / observability.
 void