TUI: honor explicit session key in global scope

src/tui/tui.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { resolveFinalAssistantText } from "./tui.js";
+import { resolveFinalAssistantText, resolveTuiSessionKey } from "./tui.js";
 
 describe("resolveFinalAssistantText", () => {
   it("falls back to streamed text when final text is empty", () => {
@@ -15,3 +15,35 @@ describe("resolveFinalAssistantText", () => {
     ).toBe("All done");
   });
 });
+
+describe("resolveTuiSessionKey", () => {
+  it("uses global only as the default when scope is global", () => {
+    expect(
+      resolveTuiSessionKey({
+        raw: "",
+        sessionScope: "global",
+        currentAgentId: "main",
+        sessionMainKey: "agent:main:main",
+      }),
+    ).toBe("global");
+    expect(
+      resolveTuiSessionKey({
+        raw: "test123",
+        sessionScope: "global",
+        currentAgentId: "main",
+        sessionMainKey: "agent:main:main",
+      }),
+    ).toBe("agent:main:test123");
+  });
+
+  it("keeps explicit agent-prefixed keys unchanged", () => {
+    expect(
+      resolveTuiSessionKey({
+        raw: "agent:ops:incident",
+        sessionScope: "global",
+        currentAgentId: "main",
+        sessionMainKey: "agent:main:main",
+      }),
+    ).toBe("agent:ops:incident");
+  });
+});