fix(sdk): correct broken AndroidX package entries and add CI validation guard

build/ci/.azure-devops-stages.yml

@@ -18,9 +18,11 @@ stages:
         README.md
         README/**
         build/**
+        src/Uno.Sdk/**
 
     - template: templates/gitversion-run.yml
     - template: setup/.azure-devops-setup-commitsar.yml
+    - template: setup/.azure-devops-setup-validate-packages.yml
     - template: setup/.azure-devops-setup-doc-validations.yml
 
   - job: DetermineScope

build/ci/scripts/validate-packages-json.ps1

@@ -0,0 +1,141 @@
+#!/usr/bin/env pwsh
+<#
+.SYNOPSIS
+    Validates that all package IDs and versions in src/Uno.Sdk/packages.json exist on NuGet.org.
+
+.DESCRIPTION
+    Parses packages.json, skips groups with placeholder versions (e.g. "DefaultUnoVersion"),
+    and verifies each package ID + version (including versionOverride entries) against NuGet.org.
+    Exits with code 1 if any package/version is missing.
+
+.PARAMETER PackagesJsonPath
+    Path to the packages.json file. Defaults to src/Uno.Sdk/packages.json relative to repo root.
+#>
+param(
+    [string]$PackagesJsonPath,
+    [switch]$WarningOnly
+)
+
+$ErrorActionPreference = 'Stop'
+
+# Auto-detect: on release/* branches, switch to warning-only mode
+# (stable builds test with versions not yet public on NuGet.org)
+if (-not $WarningOnly) {
+    $branch = $env:BUILD_SOURCEBRANCH
+    if ($branch -and $branch -like 'refs/heads/release/*') {
+        Write-Host "Detected release branch ($branch) - running in warning-only mode." -ForegroundColor Yellow
+        $WarningOnly = $true
+    }
+}
+
+# Resolve path
+if (-not $PackagesJsonPath) {
+    $repoRoot = Split-Path -Parent (Split-Path -Parent (Split-Path -Parent $PSScriptRoot))
+    $PackagesJsonPath = Join-Path $repoRoot 'src/Uno.Sdk/packages.json'
+}
+
+if (-not (Test-Path $PackagesJsonPath)) {
+    Write-Error "packages.json not found at: $PackagesJsonPath"
+    exit 1
+}
+
+Write-Host "Validating packages.json: $PackagesJsonPath" -ForegroundColor Cyan
+
+$json = Get-Content $PackagesJsonPath -Raw | ConvertFrom-Json
+$errors = @()
+$checked = 0
+
+# Placeholder versions that should not be validated against NuGet
+$placeholderVersions = @('DefaultUnoVersion')
+
+foreach ($group in $json) {
+    $groupName = $group.group
+    $baseVersion = $group.version
+    $packages = $group.packages
+
+    # Skip groups with placeholder versions
+    if ($placeholderVersions -contains $baseVersion) {
+        Write-Host "  [SKIP] $groupName (placeholder version: $baseVersion)" -ForegroundColor DarkGray
+        continue
+    }
+
+    # Collect all version+package combinations to check
+    $versionsToCheck = @()
+
+    # Base version
+    $versionsToCheck += @{ Version = $baseVersion; Label = 'base' }
+
+    # Version overrides (TFM-specific)
+    if ($group.PSObject.Properties['versionOverride'] -and $null -ne $group.versionOverride) {
+        $overrides = $group.versionOverride
+        foreach ($prop in $overrides.PSObject.Properties) {
+            $versionsToCheck += @{ Version = $prop.Value; Label = "override($($prop.Name))" }
+        }
+    }
+
+    foreach ($pkg in $packages) {
+        foreach ($vEntry in $versionsToCheck) {
+            $version = $vEntry.Version
+            $label = $vEntry.Label
+
+            # Also skip overrides that reference a placeholder
+            if ($placeholderVersions -contains $version) {
+                continue
+            }
+
+            $checked++
+            $url = "https://api.nuget.org/v3-flatcontainer/$($pkg.ToLowerInvariant())/$($version.ToLowerInvariant())/$($pkg.ToLowerInvariant()).nuspec"
+
+            try {
+                $response = Invoke-WebRequest -Uri $url -Method Head -UseBasicParsing -ErrorAction Stop
+                if ($response.StatusCode -eq 200) {
+                    Write-Host "  [OK] $pkg $version ($label)" -ForegroundColor Green
+                }
+            }
+            catch {
+                $httpResponse = $_.Exception.Response
+                if ($null -ne $httpResponse) {
+                    $statusCode = $httpResponse.StatusCode.value__
+                    if ($statusCode -eq 404) {
+                        Write-Host "  [MISSING] $pkg $version ($label) - NOT FOUND on NuGet" -ForegroundColor Red
+                        $errors += "Group '$groupName': $pkg $version ($label) does not exist on NuGet.org"
+                    }
+                    else {
+                        Write-Host "  [ERROR] $pkg $version ($label) - HTTP $statusCode" -ForegroundColor Yellow
+                        $errors += "Group '$groupName': $pkg $version ($label) - HTTP error $statusCode"
+                    }
+                }
+                else {
+                    Write-Host "  [ERROR] $pkg $version ($label) - $($_.Exception.Message)" -ForegroundColor Yellow
+                    $errors += "Group '$groupName': $pkg $version ($label) - network error: $($_.Exception.Message)"
+                }
+            }
+        }
+    }
+}
+
+Write-Host ""
+Write-Host "Checked $checked package/version combinations." -ForegroundColor Cyan
+
+if ($errors.Count -gt 0) {
+    Write-Host ""
+    if ($WarningOnly) {
+        Write-Host "VALIDATION WARNINGS - $($errors.Count) package(s) not found on NuGet.org (non-fatal):" -ForegroundColor Yellow
+    }
+    else {
+        Write-Host "VALIDATION FAILED - $($errors.Count) error(s):" -ForegroundColor Red
+    }
+    foreach ($err in $errors) {
+        Write-Host "  - $err" -ForegroundColor $(if ($WarningOnly) { 'Yellow' } else { 'Red' })
+    }
+    if ($WarningOnly) {
+        Write-Host ""
+        Write-Host "Running in warning-only mode (stable branch) - not failing the build." -ForegroundColor Yellow
+        exit 0
+    }
+    exit 1
+}
+else {
+    Write-Host "All packages validated successfully." -ForegroundColor Green
+    exit 0
+}

build/ci/setup/.azure-devops-setup-validate-packages.yml

@@ -0,0 +1,9 @@
+steps:
+- task: PowerShell@2
+  displayName: Validate packages.json (NuGet existence check)
+  inputs:
+    pwsh: true
+    filePath: build/ci/scripts/validate-packages-json.ps1
+    arguments: '-PackagesJsonPath "$(Build.SourcesDirectory)/src/Uno.Sdk/packages.json"'
+  env:
+    BUILD_SOURCEBRANCH: $(Build.SourceBranch)

src/Uno.Sdk/packages.json

@@ -281,7 +281,7 @@
 		"group": "AndroidXCarApp",
 		"version": "1.4.0.2",
 		"packages": [
-			"Xamarin.AndroidX.Car.App"
+			"Xamarin.AndroidX.Car.App.App"
 		],
 		"versionOverride": {
 			"net10.0": "1.4.0.3"
@@ -294,17 +294,17 @@
 			"Xamarin.AndroidX.Wear"
 		],
 		"versionOverride": {
-			"net10.0": "1.3.0.17"
+			"net10.0": "1.4.0.1"
 		}
 	},
 	{
 		"group": "AndroidXWearTiles",
-		"version": "1.4.0.2",
+		"version": "1.4.0.1",
 		"packages": [
 			"Xamarin.AndroidX.Wear.Tiles"
 		],
 		"versionOverride": {
-			"net10.0": "1.4.0.3"
+			"net10.0": "1.4.1"
 		}
 	},
 	{