feat(adb): add adb devices command wrapper (#5)

src/WinDroid.Adb/Services/AdbDeviceService.cs

@@ -0,0 +1,65 @@
+using WinDroid.Adb.Models;
+
+namespace WinDroid.Adb.Services;
+
+/// <summary>
+/// Runs the <c>adb devices</c> command by delegating to <see cref="ProcessRunner"/>.
+/// </summary>
+/// <remarks>
+/// This wrapper only launches the command and returns the raw
+/// <see cref="CommandResult"/>. It does not resolve the ADB path (the caller
+/// supplies an already-resolved path, typically from
+/// <see cref="AdbPathResolver"/>) and it does not parse the output. Parsing of
+/// the device listing is intentionally left to a later stage.
+/// </remarks>
+public sealed class AdbDeviceService
+{
+    private readonly ProcessRunner _processRunner;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="AdbDeviceService"/> class.
+    /// </summary>
+    /// <param name="processRunner">The process runner used to execute ADB.</param>
+    /// <exception cref="ArgumentNullException">
+    /// <paramref name="processRunner"/> is <see langword="null"/>.
+    /// </exception>
+    public AdbDeviceService(ProcessRunner processRunner)
+    {
+        ArgumentNullException.ThrowIfNull(processRunner);
+
+        _processRunner = processRunner;
+    }
+
+    /// <summary>
+    /// Runs <c>adb devices</c> using the supplied ADB executable path and returns
+    /// the raw result.
+    /// </summary>
+    /// <param name="adbPath">
+    /// Path to the ADB executable, already resolved by the caller. It is passed
+    /// through unchanged; this method does not revalidate or normalize it.
+    /// </param>
+    /// <param name="timeout">
+    /// Optional maximum run time, forwarded to <see cref="ProcessRunner"/>.
+    /// <see langword="null"/> means no timeout.
+    /// </param>
+    /// <param name="cancellationToken">
+    /// Token forwarded to <see cref="ProcessRunner"/> to cancel execution.
+    /// </param>
+    /// <returns>
+    /// The unmodified <see cref="CommandResult"/> produced by
+    /// <see cref="ProcessRunner"/>, including its output, exit code, and timeout
+    /// or cancellation state.
+    /// </returns>
+    /// <exception cref="ArgumentException">
+    /// <paramref name="adbPath"/> is <see langword="null"/>, empty, or whitespace.
+    /// </exception>
+    public Task<CommandResult> GetDevicesAsync(
+        string adbPath,
+        TimeSpan? timeout = null,
+        CancellationToken cancellationToken = default)
+    {
+        ArgumentException.ThrowIfNullOrWhiteSpace(adbPath);
+
+        return _processRunner.RunAsync(adbPath, ["devices"], timeout, cancellationToken);
+    }
+}