Add failing E2E repro: /yaml editor rejects configs containing kind: Other

Unfiled bug found during issue triage. YamlFileComponent.razor keeps its
own copy of the kind discriminator map (the fourth hand-maintained kind
registry, after Resource.cs, RackPeekConfigMigrationDeserializer and
ResourceCollectionMerger) and Other was never added to it. Saving any
config containing an Other resource through the /yaml page fails
validation, while the loader, importer, CLI and MCP all accept the same
document.

The test fails on staging: yaml-file-error appears on save. Fix
direction: reuse the loader's discriminator map (or a single shared kind
registry) instead of a duplicated inline dictionary.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Tests.E2e/YamlEditorOtherKindTests.cs

@@ -0,0 +1,73 @@
+using Microsoft.Playwright;
+using Tests.E2e.Infra;
+using Xunit.Abstractions;
+
+namespace Tests.E2e;
+
+/// <summary>
+///     Repro for an unfiled bug found during issue triage: the /yaml editor's
+///     YamlFileComponent carries its own copy of the kind discriminator map
+///     (YamlFileComponent.razor:212-224), and `Other` was never added to it —
+///     the fourth hand-maintained kind registry to drift. Saving any config
+///     that contains a `kind: Other` resource through the /yaml page fails
+///     validation, even though the loader, importer, CLI and MCP all accept
+///     it. This test fails on staging until the map (ideally all four
+///     registries) is unified.
+/// </summary>
+public class YamlEditorOtherKindTests(
+    PlaywrightFixture fixture,
+    ITestOutputHelper output) : E2ETestBase(fixture, output) {
+    private readonly PlaywrightFixture _fixture = fixture;
+    private readonly ITestOutputHelper _output = output;
+
+    private static string ConfigWithOther(string name) =>
+        $"""
+         version: 4
+         resources:
+         - kind: Other
+           name: {name}
+           model: KVM-4P
+           description: Rack KVM switch
+         connections: []
+         """;
+
+    [Fact]
+    public async Task The_Yaml_Editor_Accepts_A_Config_Containing_An_Other_Resource() {
+        (IBrowserContext context, IPage page) = await CreatePageAsync();
+
+        var name = $"e2e-oth-{Guid.NewGuid():N}"[..14];
+
+        try {
+            await page.GotoAsync($"{_fixture.BaseUrl}/yaml");
+
+            ILocator content = page.GetByTestId("yaml-file-content");
+            await Assertions.Expect(content).ToBeVisibleAsync();
+
+            await Assertions.Expect(page.GetByTestId("circuit-probe"))
+                .ToHaveAttributeAsync("data-circuit-ready", "true");
+
+            await page.GetByRole(AriaRole.Button, new() { Name = "Edit" }).ClickAsync();
+
+            ILocator textarea = page.Locator("textarea");
+            await Assertions.Expect(textarea).ToBeVisibleAsync();
+            await textarea.FillAsync(ConfigWithOther(name));
+
+            await page.GetByRole(AriaRole.Button, new() { Name = "Save" }).ClickAsync();
+
+            // The same document loads fine through the CLI, the importer and
+            // the MCP server; the editor must not reject it. Today it shows
+            // a validation error because its discriminator map lacks Other.
+            await Assertions.Expect(page.GetByTestId("yaml-file-error")).ToHaveCountAsync(0);
+            await Assertions.Expect(content).ToBeVisibleAsync();
+            await Assertions.Expect(content).ToContainTextAsync(name);
+        }
+        catch (Exception) {
+            _output.WriteLine($"TEST FAILED — URL: {page.Url}");
+            _output.WriteLine(await page.ContentAsync());
+            throw;
+        }
+        finally {
+            await context.CloseAsync();
+        }
+    }
+}