add meta

meta/src/commonMain/kotlin/MetaContainerRootMapWarning.kt

@@ -0,0 +1,17 @@
+package dev.inmo.micro_utils.meta
+
+/**
+ * Marks the direct use of [MetaContainer.map] as requiring explicit opt-in.
+ *
+ * This annotation warns against direct manipulation of the internal map without using
+ * the type-safe accessors, which could break type safety guarantees.
+ */
+@RequiresOptIn(
+    "Do not use this directly without any special reason",
+    RequiresOptIn.Level.WARNING
+)
+@Target(
+    AnnotationTarget.FIELD,
+)
+@Retention(AnnotationRetention.BINARY)
+annotation class MetaContainerRootMapWarning