Fix include order in hakmem.c - move hak_kpi_util.inc.h before hak_core_init.inc.h

Problem: hak_core_init.inc.h references KPI measurement variables
(g_latency_histogram, g_latency_samples, g_baseline_soft_pf, etc.)
but hakmem.c was including hak_kpi_util.inc.h AFTER hak_core_init.inc.h,
causing undefined reference errors.

Solution: Reorder includes so hak_kpi_util.inc.h (definition) comes
before hak_core_init.inc.h (usage).

Build result: ✅ Success (libhakmem.so 547KB, 0 errors)

Minor changes:
- Added extern __thread declarations for TLS SLL debug variables
- Added signal handler logging for debug_dump_last_push
- Improved hakmem_tiny.c structure for Phase 2 preparation

🤖 Generated with Claude Code + Task Agent

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

check_addr.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    void* p = malloc(10);
+    printf("Malloc ptr: %p\n", p);
+    unsigned long long addr = (unsigned long long)p;
+    if (addr > 0x00007fffffffffffULL) {
+        printf("Address > 48-bit detected!\n");
+    } else {
+        printf("Address within 48-bit range.\n");
+    }
+    free(p);
+    return 0;
+}
+