fix: use 1000.0.0 for private @react-native-macos/ package versions

Update the enforceReactNativeMacosPrivatePackageVersion constraint to
use 1000.0.0 instead of 0.1.0, matching the upstream convention. Also
remove the isMainBranch guard so the constraint applies on all branches.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Saadnajmi

yarn.config.cjs

@@ -137,22 +137,6 @@ 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
@@ -174,13 +158,29 @@ function enforceReactNativeMacOSDependencyConsistency({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?.startsWith('@react-native-macos/');
+        const isPrivate = workspace.manifest.private;
+
+        if (isReactNativeMacosScoped && isPrivate) {
+            workspace.set('version', '1000.0.0');
+        }
+    }
+}
+
 module.exports = defineConfig({
   constraints: async ctx => {
     enforcePrivateReactNativeScopedPackages(ctx);
     enforceReactNativeVersionConsistency(ctx);
     enforceReactNativeDependencyConsistency(ctx);
     enforceReactNativeMacosVersionConsistency(ctx);
-    enforceReactNativeMacosPrivatePackageVersion(ctx);
     enforceReactNativeMacOSDependencyConsistency(ctx);
+    enforceReactNativeMacosPrivatePackageVersion(ctx);
   },
 });