refactor: unify session status model

Fixes #5

tests/GmRelay.Bot.Tests/Domain/SessionStatusTests.cs

@@ -0,0 +1,75 @@
+using System.Reflection;
+using GmRelay.Shared.Domain;
+
+namespace GmRelay.Bot.Tests.Domain;
+
+public sealed class SessionStatusTests
+{
+    [Fact]
+    public void All_ShouldContainOnlyCanonicalSessionStatuses()
+    {
+        var allProperty = typeof(SessionStatus).GetProperty(
+            "All",
+            BindingFlags.Public | BindingFlags.Static);
+
+        Assert.NotNull(allProperty);
+
+        var allStatusValues = Assert.IsAssignableFrom<IReadOnlySet<string>>(allProperty.GetValue(null));
+        var expectedStatusValues = new[]
+            {
+                SessionStatus.Planned,
+                SessionStatus.ConfirmationSent,
+                SessionStatus.Confirmed,
+                SessionStatus.Cancelled
+            }
+            .Order(StringComparer.Ordinal);
+
+        Assert.Equal(expectedStatusValues, allStatusValues.Order(StringComparer.Ordinal));
+    }
+
+    [Fact]
+    public void ProductionSources_ShouldNotReferenceLegacySessionStatuses()
+    {
+        var repositoryRoot = FindRepositoryRoot();
+        var productionFiles = Directory.EnumerateFiles(repositoryRoot, "*.*", SearchOption.AllDirectories)
+            .Where(path => IsProductionSource(path))
+            .ToList();
+
+        var legacyStatuses = new[] { "Recruit" + "ing", "Recruitment" + "Closed" };
+        var offenders = productionFiles
+            .SelectMany(path => legacyStatuses
+                .Where(status => File.ReadAllText(path).Contains(status, StringComparison.Ordinal))
+                .Select(status => $"{Path.GetRelativePath(repositoryRoot, path)} contains {status}"))
+            .ToList();
+
+        Assert.Empty(offenders);
+    }
+
+    private static bool IsProductionSource(string path)
+    {
+        var extension = Path.GetExtension(path);
+        var separator = Path.DirectorySeparatorChar;
+
+        return path.Contains($"{separator}src{separator}", StringComparison.Ordinal)
+            && !path.Contains($"{separator}bin{separator}", StringComparison.Ordinal)
+            && !path.Contains($"{separator}obj{separator}", StringComparison.Ordinal)
+            && extension is ".cs" or ".razor" or ".sql";
+    }
+
+    private static string FindRepositoryRoot()
+    {
+        var current = new DirectoryInfo(AppContext.BaseDirectory);
+
+        while (current is not null)
+        {
+            if (File.Exists(Path.Combine(current.FullName, "GM-Relay.slnx")))
+            {
+                return current.FullName;
+            }
+
+            current = current.Parent;
+        }
+
+        throw new InvalidOperationException("Could not find repository root.");
+    }
+}

tests/GmRelay.Bot.Tests/Rendering/SessionBatchRendererTests.cs

@@ -6,7 +6,7 @@ namespace GmRelay.Bot.Tests.Rendering;
 public sealed class SessionBatchRendererTests
 {
     [Fact]
-    public void Render_ShouldOrderSessionsAndSkipButtonsForClosedStatuses()
+    public void Render_ShouldOrderSessionsAndSkipButtonsForCancelledSessions()
     {
         var firstSessionId = Guid.NewGuid();
         var secondSessionId = Guid.NewGuid();
@@ -14,9 +14,9 @@ public sealed class SessionBatchRendererTests
 
         var sessions = new[]
         {
-            new SessionBatchDto(secondSessionId, new DateTime(2026, 4, 27, 18, 0, 0, DateTimeKind.Utc), "Planned"),
-            new SessionBatchDto(cancelledSessionId, new DateTime(2026, 4, 28, 18, 0, 0, DateTimeKind.Utc), "Cancelled"),
-            new SessionBatchDto(firstSessionId, new DateTime(2026, 4, 26, 18, 0, 0, DateTimeKind.Utc), "RecruitmentClosed")
+            new SessionBatchDto(secondSessionId, new DateTime(2026, 4, 27, 18, 0, 0, DateTimeKind.Utc), SessionStatus.Planned),
+            new SessionBatchDto(cancelledSessionId, new DateTime(2026, 4, 28, 18, 0, 0, DateTimeKind.Utc), SessionStatus.Cancelled),
+            new SessionBatchDto(firstSessionId, new DateTime(2026, 4, 26, 18, 0, 0, DateTimeKind.Utc), SessionStatus.Planned)
         };
         var participants = new[]
         {
@@ -37,9 +37,12 @@ public sealed class SessionBatchRendererTests
         Assert.True(secondIndex < thirdIndex);
         Assert.Contains("@alice", text);
         Assert.Contains("Bob", text);
-        Assert.Single(result.Markup.InlineKeyboard);
+        Assert.Equal(2, result.Markup.InlineKeyboard.Count());
         Assert.Collection(
             buttons.Select(button => button.CallbackData),
+            callbackData => Assert.Equal($"join_session:{firstSessionId}", callbackData),
+            callbackData => Assert.Equal($"cancel_session:{firstSessionId}", callbackData),
+            callbackData => Assert.Equal($"reschedule_session:{firstSessionId}", callbackData),
             callbackData => Assert.Equal($"join_session:{secondSessionId}", callbackData),
             callbackData => Assert.Equal($"cancel_session:{secondSessionId}", callbackData),
             callbackData => Assert.Equal($"reschedule_session:{secondSessionId}", callbackData));