microsoft
diff --git a/‎.ado/jobs/cli-init-windows.yml
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diff --git a/‎.ado/jobs/playground.yml
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diff --git a/‎.ado/publish.yml
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diff --git a/‎.ado/templates/enable-fabric-experimental-feature.yml
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diff --git a/‎.ado/templates/msbuild-sln.yml
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diff --git a/‎.ado/templates/prepare-js-env.yml
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diff --git a/‎change/@react-native-windows-automation-channel-4c7447b5-805b-4261-a652-820c2d3ed0cc.json
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diff --git a/‎change/@react-native-windows-codegen-386a49a7-d732-4d58-b692-37841cecd8b9.json
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diff --git a/‎change/react-native-windows-44e5d751-697d-41eb-806c-037f525ef1de.json
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diff --git a/‎packages/@react-native-windows/automation-channel/package.json
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@@ -403,12 +403,6 @@ jobs:
                   platform: ${{ parameters.platform }}
                   configuration: ${{ parameters.configuration }}
                   buildEnvironment: ${{ parameters.buildEnvironment }}
-
-              - task: CmdLine@2
-                displayName: Create npm directory
-                name: createNpmDirectory
-                inputs:
-                  script: mkdir %APPDATA%\npm
 
               - template: ../templates/react-native-init-windows.yml
                 parameters:
 
@@ -183,6 +183,8 @@ jobs:
                   msbuildArgs:
                     /p:PackageCertificateKeyFile=$(Build.SourcesDirectory)\EncodedKey.pfx
                     /p:PackageCertificatePassword=${{ parameters.certificatePassword }}
+                ${{if eq(matrix.SolutionFile, 'Playground-Composition.sln')}}:
+                  parallelBuild: false # required to workaround issue #13599
 
             - ${{if and(false, endsWith(matrix.Name, 'Universal'), eq(matrix.BuildConfiguration, 'Debug')) }}: # Disabled as debugging doesn't work,remove false after issue is resolved, see https://github.com/microsoft/react-native-windows/issues/13543
               # Execute debug feature tests (skip this step for the Win32 Playground app and for release builds)
 
@@ -190,9 +190,6 @@ extends:
 
           - template: .ado/templates/run-compliance-prebuild.yml@self
 
-          - script: if not exist %USERPROFILE%\AppData\Roaming\npm (mkdir %USERPROFILE%\AppData\Roaming\npm)
-            displayName: Fix missing npm config
-
           - pwsh: |
               npx beachball check --verbose 2>&1 | Tee-Object -Variable beachballOutput
               $beachballErrors = $beachballOutput | Where-Object { $_ -match "ERROR: *"}
 
@@ -5,7 +5,7 @@ steps:
       $nsm.AddNamespace('ns', $experimentalFeatures.DocumentElement.NamespaceURI)
 
       $xmlNode = $experimentalFeatures.CreateElement("PropertyGroup");
-      $xmlNode.InnerXml = "<UseFabric>true</UseFabric><UseWinUI3>true</UseWinUI3>"
+      $xmlNode.InnerXml = "<RnwNewArch>true</RnwNewArch><UseFabric>true</UseFabric><UseWinUI3>true</UseWinUI3>"
 
       $experimentalFeatures.DocumentElement.AppendChild($xmlNode);
 
 
@@ -15,6 +15,7 @@ parameters:
   msbuildArguments: ''
   warnAsError: true
   oneESMode: false
+  parallelBuild: true
 
 steps:
   - powershell: |
@@ -36,7 +37,7 @@ steps:
       platform: ${{ parameters.buildPlatform }}
       configuration: ${{ parameters.buildConfiguration }}
       clean: false # Optional
-      maximumCpuCount: true
+      maximumCpuCount: ${{parameters.parallelBuild}}
       restoreNugetPackages: false # Optional
       createLogFile: true
       logFileVerbosity: detailed
 
@@ -13,6 +13,10 @@ steps:
       inputs:
         versionSpec: '18.x'
 
+  - script: if not exist %APPDATA%\npm (mkdir %APPDATA%\npm)
+    displayName: Ensure npm directory for npx commands
+    condition: eq(variables['Agent.OS'], 'Windows_NT')
+
   - template: yarn-install.yml
     parameters:
       agentImage: ${{ parameters.agentImage }}
 
@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "[0.76] Add RnwNewArch property and RNW_NEW_ARCH constants when building projects for the new architecture",
+  "packageName": "@react-native-windows/automation-channel",
+  "email": "jthysell@microsoft.com",
+  "dependentChangeType": "patch"
+}
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "[0.76] Add RnwNewArch property and RNW_NEW_ARCH constants when building projects for the new architecture",
+  "packageName": "@react-native-windows/codegen",
+  "email": "jthysell@microsoft.com",
+  "dependentChangeType": "patch"
+}
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "[0.76] Add RnwNewArch property and RNW_NEW_ARCH constants when building projects for the new architecture",
+  "packageName": "react-native-windows",
+  "email": "jthysell@microsoft.com",
+  "dependentChangeType": "patch"
+}
@@ -22,6 +22,7 @@
     "jsonrpc-lite": "^2.2.0"
   },
   "devDependencies": {
+    "@react-native-community/cli": "15.0.0-alpha.2",
     "@rnw-scripts/eslint-config": "1.2.27",
     "@rnw-scripts/just-task": "2.3.44",
     "@rnw-scripts/ts-config": "2.0.5",