Add OBSERVE stats and auto tiny policy profile

core/box/tiny_policy_learner_box.c

@@ -1,7 +1,42 @@
 // tiny_policy_learner_box.c - Placeholder learner hook
 
 #include "tiny_policy_learner_box.h"
+#include "tiny_class_policy_box.h"
+#include "tiny_class_stats_box.h"
+#include <stdint.h>
 
+// Simple OBSERVE/LEARN rule:
+//   - Choose top-2 classes by shared_pool_lock and enable Page Box for them.
+//   - Always keep existing warm_enabled / warm_cap (policy table is already seeded).
 void tiny_policy_learner_tick(void) {
-    // FROZEN/OBSERVE: intentionally empty.
+    TinyClassStatsThread snap = {0};
+    tiny_class_stats_snapshot_global(&snap);
+
+    int top1 = -1, top2 = -1;
+    uint64_t v1 = 0, v2 = 0;
+    for (int i = 0; i < TINY_NUM_CLASSES; i++) {
+        uint64_t v = snap.shared_lock[i];
+        if (v > v1) {
+            top2 = top1;
+            v2 = v1;
+            top1 = i;
+            v1 = v;
+        } else if (v > v2) {
+            top2 = i;
+            v2 = v;
+        }
+    }
+
+    // Nothing observed yet → leave policy untouched
+    if (v1 == 0) {
+        return;
+    }
+
+    for (int c = 0; c < TINY_NUM_CLASSES; c++) {
+        TinyClassPolicy* p = &g_tiny_class_policy[c];
+        if (c == top1 || c == top2) {
+            p->page_box_enabled = 1;
+            p->warm_enabled = 1;
+        }
+    }
 }