feat(degree): /degree/degree_list returns owned ids

SVSim.EmulatedEntrypoint/Controllers/DegreeController.cs

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+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using SVSim.Database;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Common;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Degree;
+using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Degree;
+
+namespace SVSim.EmulatedEntrypoint.Controllers;
+
+/// <summary>
+/// /degree/* — viewer-scoped degree (title) management. Read, mark-favorite, set-currently-displayed.
+/// Mirrors /sleeve/* and /emblem/*; favorite handler is no-op like the others until a viewer-favorites
+/// schema lands (would also serve /sleeve/favorite + /emblem/favorite via the shared Wizard/FavoriteTask.cs Kind enum).
+/// </summary>
+[Route("degree")]
+public class DegreeController : SVSimController
+{
+    private readonly SVSimDbContext _db;
+
+    public DegreeController(SVSimDbContext db) => _db = db;
+
+    [HttpPost("degree_list")]
+    public async Task<ActionResult<DegreeListResponse>> DegreeList(DegreeListRequest _, CancellationToken ct)
+    {
+        if (!TryGetViewerId(out long viewerId)) return Unauthorized();
+
+        var viewer = await _db.Viewers
+            .Include(v => v.Degrees)
+            .FirstOrDefaultAsync(v => v.Id == viewerId, ct);
+        if (viewer is null) return Unauthorized();
+
+        return new DegreeListResponse
+        {
+            UserDegreeList = viewer.Degrees
+                .Select(d => new DegreeListEntry { DegreeId = d.Id })
+                .OrderBy(e => e.DegreeId)
+                .ToList(),
+        };
+    }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Requests/Degree/DegreeListRequest.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Requests.Degree;
+
+[MessagePackObject]
+public class DegreeListRequest : BaseRequest
+{
+    [JsonPropertyName("degree_id")]
+    [Key("degree_id")]
+    public int DegreeId { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Degree/DegreeListEntry.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Degree;
+
+[MessagePackObject]
+public class DegreeListEntry
+{
+    [JsonPropertyName("degree_id")]
+    [Key("degree_id")]
+    public int DegreeId { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Responses/Degree/DegreeListResponse.cs

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+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Responses.Degree;
+
+[MessagePackObject]
+public class DegreeListResponse
+{
+    [JsonPropertyName("user_degree_list")]
+    [Key("user_degree_list")]
+    public List<DegreeListEntry> UserDegreeList { get; set; } = new();
+}

SVSim.UnitTests/Controllers/DegreeControllerListTests.cs

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+using System.Net;
+using System.Text;
+using System.Text.Json;
+using NUnit.Framework;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using SVSim.Database;
+using SVSim.Database.Models;
+using SVSim.UnitTests.Infrastructure;
+
+namespace SVSim.UnitTests.Controllers;
+
+public class DegreeControllerListTests
+{
+    [Test]
+    public async Task DegreeList_returns_owned_ids_wrapped()
+    {
+        using var factory = new SVSimTestFactory();
+        long viewerId = await factory.SeedViewerAsync(tutorialState: 0);
+
+        using (var scope = factory.Services.CreateScope())
+        {
+            var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+            var viewer = await db.Viewers.Include(v => v.Degrees).FirstAsync(v => v.Id == viewerId);
+            var d100 = await db.Set<DegreeEntry>().FirstOrDefaultAsync(d => d.Id == 100)
+                       ?? db.Set<DegreeEntry>().Add(new DegreeEntry { Id = 100 }).Entity;
+            var d101 = await db.Set<DegreeEntry>().FirstOrDefaultAsync(d => d.Id == 101)
+                       ?? db.Set<DegreeEntry>().Add(new DegreeEntry { Id = 101 }).Entity;
+            viewer.Degrees.Add(d100);
+            viewer.Degrees.Add(d101);
+            await db.SaveChangesAsync();
+        }
+
+        using var client = factory.CreateAuthenticatedClient(viewerId);
+        var requestJson = """{"degree_id":0,"viewer_id":"0","steam_id":0,"steam_session_ticket":""}""";
+        var response = await client.PostAsync("/degree/degree_list",
+            new StringContent(requestJson, Encoding.UTF8, "application/json"));
+
+        Assert.That(response.StatusCode, Is.EqualTo(HttpStatusCode.OK));
+
+        var body = await response.Content.ReadAsStringAsync();
+        using var doc = JsonDocument.Parse(body);
+        var ids = doc.RootElement.GetProperty("user_degree_list").EnumerateArray()
+            .Select(e => e.GetProperty("degree_id").GetInt32())
+            .ToList();
+        Assert.That(ids, Does.Contain(100));
+        Assert.That(ids, Does.Contain(101));
+    }
+}