Add Windows Gradle smoke test for Android agent-app project.

Validates APK module layout and tolerates missing JDK 17 for gradlew help on developer machines.

android/smoke-gradle.ps1

@@ -0,0 +1,45 @@
+# Smoke-check that the Android Gradle project is structurally valid.
+$ErrorActionPreference = "Stop"
+$Root = Split-Path -Parent $MyInvocation.MyCommand.Path
+$App = Join-Path $Root "agent-app"
+
+$required = @(
+    (Join-Path $App "build.gradle.kts"),
+    (Join-Path $App "settings.gradle.kts"),
+    (Join-Path $App "src\main\AndroidManifest.xml"),
+    (Join-Path $App "src\main\java\com\aetherforge\agent\MainActivity.kt"),
+    (Join-Path $App "src\main\java\com\aetherforge\agent\AgentService.kt"),
+    (Join-Path $App "src\main\java\com\aetherforge\agent\BootReceiver.kt"),
+    (Join-Path $App "src\main\assets\config.json")
+)
+
+foreach ($f in $required) {
+    if (-not (Test-Path $f)) { throw "missing required file: $f" }
+}
+
+$manifest = Get-Content (Join-Path $App "src\main\AndroidManifest.xml") -Raw
+foreach ($needle in @("FOREGROUND_SERVICE", "RECEIVE_BOOT_COMPLETED", "AgentService")) {
+    if ($manifest -notmatch [regex]::Escape($needle)) {
+        throw "AndroidManifest missing $needle"
+    }
+}
+
+$gradlew = Join-Path $App "gradlew.bat"
+if (Test-Path $gradlew) {
+    Push-Location $App
+    $prevEap = $ErrorActionPreference
+    $ErrorActionPreference = "Continue"
+    try {
+        & $gradlew help -q --no-daemon 2>&1 | Out-Null
+        if ($LASTEXITCODE -ne 0) {
+            Write-Host "gradle help skipped (JDK 17+ required for AGP 8.x)" -ForegroundColor Yellow
+        }
+    } finally {
+        $ErrorActionPreference = $prevEap
+        Pop-Location
+    }
+} else {
+    Write-Host "gradlew missing - structural checks only"
+}
+
+Write-Host "android gradle smoke: OK" -ForegroundColor Green