feat: pin sessions to workspace revisions

frontend/src/api/sessions.test.ts

@@ -6,16 +6,25 @@ import {
   deleteSession, getSessionDocuments,
 } from "./sessions";
 
-test("createSession POSTs only {question} and returns the id", async () => {
+test("createSession migrates legacy selections and POSTs browser preferences", async () => {
+  localStorage.clear();
   let body: unknown = null;
   server.use(
+    http.get("http://localhost:8787/settings", () => HttpResponse.json({
+      workspace: "psd-clinical", provider: "zai", model: "glm-5.2", thinking: "low",
+    })),
     http.post("http://localhost:8787/sessions", async ({ request }) => {
       body = await request.json();
       return HttpResponse.json({ id: "s1" });
     }),
   );
   expect(await createSession({ question: "q" })).toEqual({ id: "s1" });
-  expect(body).toEqual({ question: "q" });
+  expect(body).toEqual({
+    question: "q", workspaceId: "psd-clinical", provider: "zai", model: "glm-5.2", thinking: "low",
+  });
+  expect(JSON.parse(localStorage.getItem("thothii.workspace-registry.v1.preferences")!)).toEqual({
+    workspaceId: "psd-clinical", provider: "zai", model: "glm-5.2", thinking: "low",
+  });
 });
 
 test.each([202, 204])("prewarmRuntime accepts a body-less %s response", async (status) => {