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src/Cli/StellaOps.Cli/Services/AuthorityConsoleClient.cs

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+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Net.Http.Json;
+using System.Threading;
+using System.Threading.Tasks;
+using StellaOps.Cli.Services.Models;
+
+namespace StellaOps.Cli.Services;
+
+/// <summary>
+/// HTTP client for Authority console endpoints (CLI-TEN-47-001).
+/// </summary>
+internal sealed class AuthorityConsoleClient : IAuthorityConsoleClient
+{
+    private readonly HttpClient _httpClient;
+
+    public AuthorityConsoleClient(HttpClient httpClient)
+    {
+        _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
+    }
+
+    public async Task<IReadOnlyList<TenantInfo>> ListTenantsAsync(string tenant, CancellationToken cancellationToken)
+    {
+        using var request = new HttpRequestMessage(HttpMethod.Get, "console/tenants");
+
+        if (!string.IsNullOrWhiteSpace(tenant))
+        {
+            request.Headers.Add("X-StellaOps-Tenant", tenant.Trim().ToLowerInvariant());
+        }
+
+        using var response = await _httpClient.SendAsync(request, cancellationToken).ConfigureAwait(false);
+        response.EnsureSuccessStatusCode();
+
+        var result = await response.Content
+            .ReadFromJsonAsync<TenantListResponse>(cancellationToken: cancellationToken)
+            .ConfigureAwait(false);
+
+        return result?.Tenants ?? Array.Empty<TenantInfo>();
+    }
+}