chore: lock the plugin boundary and remove 2.9.0 leftovers

plugins/termix-identity/tests/backend/legacy-urls.test.ts

@@ -0,0 +1,20 @@
+import { describe, expect, it } from "vitest";
+import { validateManifest } from "@termix/plugin-sdk/manifest";
+import manifest from "../../manifest.json";
+
+// Old URLs something outside Termix still calls keep reaching the plugin.
+const redirects = manifest.contributes.http.legacyRedirects as unknown[];
+
+describe("legacy URLs", () => {
+  it("declares them in a manifest that validates", () => {
+    expect(validateManifest(manifest)).toEqual([]);
+  });
+
+  it("redirects /termix-id/u, which servers provisioned with a 2.8 Termix ID resolver URL fetch", () => {
+    expect(redirects).toContainEqual({
+      from: "/termix-id/u",
+      to: "/u",
+      status: 308,
+    });
+  });
+});