refactor: polish assistant-ui chat surface and rename tools

- Remove useExternalStoreRuntime (caused duplicate ID crashes on re-render)
- Render messages directly from projected data for read-only transcripts
- ToolCard open by default for single tools, collapsed inside ToolGroupCard
- Remove result bubble from ToolCard (was unstyled)
- Move run button below thread (chat-style layout)
- Add user/assistant visual distinction (right-aligned cyan bubble for user)
- Rename startPreparedReportRun -> startRun
- Add 3 workflow.run_once tool calls to Scene 2
- Add overflow handling with max-height + hidden overflow
- Update all tests for new behavior

web/apps/console/src/presentation/opening/ProblemLoopScene.test.tsx

@@ -10,17 +10,14 @@ afterEach(() => cleanup());
 
 describe("ProblemLoopScene", () => {
   it("uses the assistant transcript surface for the direct-action side", async () => {
-    const user = userEvent.setup();
     render(<ProblemLoopScene scene={problemScene} beat={findBeat("problem", "direct-actions")!} />);
 
     const transcript = screen.getByRole("log", { name: /one-off assistant transcript/i });
     expect(transcript).toHaveClass("assistant-operator-thread");
     expect(within(transcript).getByText("Can you finish this workspace task?")).toBeInTheDocument();
-    expect(within(transcript).getByRole("button", { name: /workspace.run_once/i })).toBeInTheDocument();
-    expect(within(transcript).getByText("Reports success, but leaves no reusable workflow behind.")).toBeInTheDocument();
-
-    await user.click(within(transcript).getByRole("button", { name: /workspace.run_once/i }));
-    expect(within(transcript).getByText(/ephemeral/i)).toBeInTheDocument();
+    const toolButtons = within(transcript).getAllByRole("button", { name: /workflow.run_once/i });
+    expect(toolButtons).toHaveLength(3);
+    expect(within(transcript).getByText("Done. But none of this is recorded in a durable workflow.")).toBeInTheDocument();
   });
 
   it("renders reusable automation as a durable workflow blueprint", () => {

web/apps/console/src/presentation/opening/ProblemLoopScene.tsx

@@ -19,12 +19,28 @@ const oneOffToolLoopMessages: ReadonlyArray<AgentMessage> = [
       {
         type: "tool-call",
         call: {
-          id: "scene-2-tool",
-          name: "workspace.run_once" as AgentToolName,
-          input: { persistence: "ephemeral", reusable_workflow: false },
+          id: "scene-2-tool-1",
+          name: "workflow.run_once" as AgentToolName,
+          input: { source: "api", endpoint: "/tasks" },
         },
       },
-      { type: "text", text: "Reports success, but leaves no reusable workflow behind." },
+      {
+        type: "tool-call",
+        call: {
+          id: "scene-2-tool-2",
+          name: "workflow.run_once" as AgentToolName,
+          input: { format: "json", validate: true },
+        },
+      },
+      {
+        type: "tool-call",
+        call: {
+          id: "scene-2-tool-3",
+          name: "workflow.run_once" as AgentToolName,
+          input: { destination: "file", path: "/tmp/result.json" },
+        },
+      },
+      { type: "text", text: "Done. But none of this is recorded in a durable workflow." },
     ],
   },
 ];