fix(0.81): fix yarn constraints failures after release bumps (#2909)

## Summary
- Mark root `@react-native-macos/monorepo` and
`@react-native-macos/nx-release-version` packages as `private: true`
with a fixed version of `1000.0.0`
- Add `enforceReactNativeMacosPrivatePackageVersion` yarn constraint to
enforce this
- Decouples internal packages from release versioning — nx release only
bumps `react-native-macos` and `@react-native-macos/virtualized-lists`,
so these internal packages were getting left behind and causing `yarn
constraints` to fail after every release

## Test plan
- [x] `yarn constraints` passes locally

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: Saadnajmi

package.json

@@ -1,6 +1,7 @@
 {
   "name": "@react-native-macos/monorepo",
-  "version": "0.81.5",
+  "private": true,
+  "version": "1000.0.0",
   "license": "MIT",
   "packageManager": "yarn@4.13.0",
   "scripts": {

packages/nx-release-version/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@react-native-macos/nx-release-version",
-  "version": "0.1.0",
   "private": true,
+  "version": "1000.0.0",
   "description": "Nx Release Version Actions for React Native macOS",
   "homepage": "https://github.com/microsoft/react-native-macos/tree/HEAD/packages/nx-release-version#readme",
   "license": "MIT",

yarn.config.cjs

@@ -137,6 +137,22 @@ function enforceReactNativeMacosVersionConsistency({Yarn}) {
     }   
 }
 
+/**
+ * Enforce that all private @react-native-macos/ scoped packages use a fixed
+ * version of 1000.0.0, so they are decoupled from release versioning.
+ * @param {Context} context
+ */
+function enforceReactNativeMacosPrivatePackageVersion({Yarn}) {
+    for (const workspace of Yarn.workspaces()) {
+        const isReactNativeMacosScoped = workspace.ident && workspace.ident.startsWith('@react-native-macos/');
+        const isPrivate = workspace.manifest.private;
+
+        if (isReactNativeMacosScoped && isPrivate) {
+            workspace.set('version', '1000.0.0');
+        }
+    }
+}
+
 /**
  * Enforce that all @react-native-macos/ scoped dependencies use the same version
  * as the react-native-macos
@@ -158,32 +174,13 @@ function enforceReactNativeMacOSDependencyConsistency({Yarn}) {
     }
 }
 
-/**
- * Enforce that private @react-native-macos/ scoped packages (i.e. internal
- * tooling that is not forked from upstream) have a fixed version of 0.1.0.
- * These packages do not track the react-native-macos release version.
- * @param {Context} context
- */
-function enforceReactNativeMacosPrivatePackageVersion({Yarn}) {
-    if (!isMainBranch({Yarn})) {
-        for (const workspace of Yarn.workspaces()) {
-            const isReactNativeMacosScoped = workspace.ident?.startsWith('@react-native-macos/');
-            const isPrivate = workspace.manifest.private;
-
-            if (isReactNativeMacosScoped && isPrivate) {
-                workspace.set('version', '0.1.0');
-            }
-        }
-    }
-}
-
 module.exports = defineConfig({
   constraints: async ctx => {
     enforcePrivateReactNativeScopedPackages(ctx);
     enforceReactNativeVersionConsistency(ctx);
     enforceReactNativeDependencyConsistency(ctx);
     enforceReactNativeMacosVersionConsistency(ctx);
-    enforceReactNativeMacOSDependencyConsistency(ctx);
     enforceReactNativeMacosPrivatePackageVersion(ctx);
+    enforceReactNativeMacOSDependencyConsistency(ctx);
   },
 });