refactor(core): dedupe shared config and runtime helpers

src/infra/map-size.ts

@@ -0,0 +1,15 @@
+export function pruneMapToMaxSize<K, V>(map: Map<K, V>, maxSize: number): void {
+  const limit = Math.max(0, Math.floor(maxSize));
+  if (limit <= 0) {
+    map.clear();
+    return;
+  }
+
+  while (map.size > limit) {
+    const oldest = map.keys().next();
+    if (oldest.done) {
+      break;
+    }
+    map.delete(oldest.value);
+  }
+}