refactor(site-runtime): excise vestigial site-side notification-list surface — repo, DI registration, dead write paths (arch-review 08 §1.3/#23)

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj

tests/ZB.MOM.WW.ScadaBridge.SiteRuntime.Tests/Repositories/SiteRepositoryTests.cs

@@ -199,25 +199,8 @@ public class SiteRepositoryTests : IDisposable
         Assert.Null(await repo.GetDatabaseConnectionByNameAsync("DoesNotExist"));
     }
 
-    /// <summary>
-    /// SiteRuntime-007: the same stability guarantee for notification lists.
-    /// </summary>
-    [Fact]
-    public async Task NotificationRepository_SyntheticId_IsStableAcrossRestart()
-    {
-        var storage1 = NewStorage();
-        await storage1.InitializeAsync();
-        await storage1.StoreNotificationListAsync(
-            "OnCall", new[] { "a@example.com", "b@example.com" });
-
-        var repo1 = new SiteNotificationRepository(storage1);
-        var idBeforeRestart = (await repo1.GetAllNotificationListsAsync())[0].Id;
-
-        var storage2 = NewStorage();
-        var repo2 = new SiteNotificationRepository(storage2);
-        var found = await repo2.GetNotificationListByIdAsync(idBeforeRestart);
-
-        Assert.NotNull(found);
-        Assert.Equal("OnCall", found.Name);
-    }
+    // NotificationRepository_SyntheticId_IsStableAcrossRestart was removed 2026-07-10
+    // (arch-review 08 §1.3/#23) along with the vestigial SiteNotificationRepository —
+    // notification config is central-only and never lives on a site. The synthetic-ID
+    // stability guarantee is still exercised by ExternalSystemRepository_SyntheticId_IsStableAcrossRestart.
 }