remove mutableReadLanes from fiber, revert ReactVersion build artifact

packages/react-reconciler/src/ReactFiberRoot.js

@@ -72,7 +72,6 @@ function FiberRootNode(
   this.suspendedLanes = NoLanes;
   this.pingedLanes = NoLanes;
   this.expiredLanes = NoLanes;
-  this.mutableReadLanes = NoLanes;
   this.finishedLanes = NoLanes;
   this.errorRecoveryDisabledLanes = NoLanes;
 

packages/react-reconciler/src/ReactInternalTypes.js

@@ -247,7 +247,6 @@ type BaseFiberRootProperties = {
   suspendedLanes: Lanes,
   pingedLanes: Lanes,
   expiredLanes: Lanes,
-  mutableReadLanes: Lanes,
   errorRecoveryDisabledLanes: Lanes,
 
   finishedLanes: Lanes,

packages/shared/ReactVersion.js

@@ -1 +1,16 @@
-export default '18.3.0-PLACEHOLDER';
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// TODO: this is special because it gets imported during build.
+//
+// TODO: 18.0.0 has not been released to NPM;
+// It exists as a placeholder so that DevTools can support work tag changes between releases.
+// When we next publish a release, update the matching TODO in backend/renderer.js
+// TODO: This module is used both by the release scripts and to expose a version
+// at runtime. We should instead inject the version number as part of the build
+// process, and use the ReactVersions.js module as the single source of truth.
+export default '18.2.0';