feat: pin sessions to workspace revisions

backend/test/routes-settings.test.ts

@@ -31,6 +31,19 @@ test("GET /settings returns effective defaults (env provider/model/thinking, fir
   }
 });
 
+test("GET /settings uses the stored installation workspace default before the harness fallback", async () => {
+  const { app, dir } = appWithTmpSettings({});
+  try {
+    writeFileSync(join(dir, "settings.json"), JSON.stringify({ workspace: "psd-clinical" }));
+
+    const response = await app.inject({ method: "GET", url: "/settings" });
+
+    expect(response.json()).toMatchObject({ workspace: "psd-clinical" });
+  } finally {
+    rmSync(dir, { recursive: true, force: true });
+  }
+});
+
 test("PUT /settings does not persist personal workspace or LLM choices", async () => {
   const { app, dir } = appWithTmpSettings({ PI_PROVIDER: "zai", PI_MODEL: "glm-5.2", PI_THINKING: "medium" }, {
     listModels: async () => [{ provider: "zai", id: "glm-5.2", name: "GLM 5.2", reasoning: true }],