feat(workspace): split menus start AI tools; drop the Tools menu

A pane's split right/down menus offered only New terminal. They now list
the same AI tools as the tab bar's + menu (newTabTools/newTabBody,
shared from ConsoleTabs), started bare in the first free slot on that
side of the pane.

The tab bar's Tools menu is gone: its readme run hit 409 ERUNLIVE
whenever slot 0 was live (always, in the session view) and depended on
a personal skill; MCP sync and the dev-sync check served the dormant
ship-feature-lane pipeline. The sidebar row menu's readme item goes too.
The routes stay, reached by `agenthub lanes mcp sync` and
`agenthub lanes sync-base`.

Also: the home's Memory header and file tabs no longer shrink (a long
file squeezed the tab row and clipped it).

client/src/components/lanes/__tests__/AddLaneModal.test.tsx

@@ -589,9 +589,8 @@ describe("AddLaneModal — folder browse", () => {
 });
 
 describe("AddLaneModal — create/update readme", () => {
-  it("no longer offers it here — it moved to the lane's Tools menu", async () => {
-    // Creating a lane and writing its docs are separate decisions, and the
-    // second one is worth re-running later; see LaneToolsMenu.
+  it("is not offered here", async () => {
+    // Creating a lane and writing its docs are separate decisions.
     renderModal();
     const user = userEvent.setup();
     await user.click(screen.getByRole("button", { name: "Repo" }));

client/src/components/lanes/__tests__/LaneCard.test.tsx

@@ -9,10 +9,10 @@
  */
 
 import { describe, it, expect, vi, beforeEach } from "vitest";
-import { render, screen, waitFor } from "@testing-library/react";
+import { render, screen } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
-import LaneCard, { LaneToolsMenu } from "../LaneCard";
-import type { Lane, LaneRuntime } from "../../../lib/types";
+import LaneCard from "../LaneCard";
+import type { Lane } from "../../../lib/types";
 import { api } from "../../../lib/api";
 
 vi.mock("../../../lib/api", () => ({
@@ -24,7 +24,6 @@ vi.mock("../../../lib/api", () => ({
       down: vi.fn(),
       preflight: vi.fn().mockResolvedValue({ blocked: [], warnings: [] }),
       mcpSync: vi.fn(),
-      syncBaseCheck: vi.fn(),
     },
     locks: {
       list: vi.fn(),
@@ -294,82 +293,3 @@ describe("LaneCard — named locks", () => {
     expect(screen.queryByTestId("lane-locks-1")).not.toBeInTheDocument();
   });
 });
-
-describe("LaneToolsMenu", () => {
-  beforeEach(() => {
-    vi.mocked(api.lanes.runtime).mockResolvedValue({
-      available: true as const,
-      provisioned: true as const,
-      up: false,
-      slot: 1,
-      profileDir: "/work/demo/.agenthub/profile",
-      ports: {},
-    } as unknown as LaneRuntime);
-  });
-
-  it("clicking Sync MCP calls the API and shows the result", async () => {
-    vi.mocked(api.lanes.mcpSync).mockResolvedValue({
-      servers: ["playwright"],
-      profilesSeeded: [],
-    });
-    render(<LaneToolsMenu lane={makeLane()} />);
-    await userEvent.click(await screen.findByTestId("lane-tools-menu"));
-    await userEvent.click(await screen.findByTestId("lane-mcp-sync"));
-    await waitFor(() => expect(api.lanes.mcpSync).toHaveBeenCalledWith(1));
-    expect(await screen.findByTestId("lane-action-result")).toHaveTextContent("playwright");
-  });
-
-  it("clicking Check dev sync reports a clean result", async () => {
-    vi.mocked(api.lanes.syncBaseCheck).mockResolvedValue({
-      code: 0,
-      devDelta: ["a.txt", "b.txt"],
-      overlap: [],
-    });
-    render(<LaneToolsMenu lane={makeLane()} />);
-    await userEvent.click(await screen.findByTestId("lane-tools-menu"));
-    await userEvent.click(await screen.findByTestId("lane-sync-check"));
-    await waitFor(() => expect(api.lanes.syncBaseCheck).toHaveBeenCalledWith(1));
-    expect(await screen.findByTestId("lane-action-result")).toHaveTextContent("2");
-  });
-
-  it("clicking Check dev sync reports a migration collision", async () => {
-    vi.mocked(api.lanes.syncBaseCheck).mockResolvedValue({
-      code: 5,
-      collisions: [{ file: "002_a.sql", collidesWith: "002_b.sql", suggestion: "003_a.sql" }],
-    });
-    render(<LaneToolsMenu lane={makeLane()} />);
-    await userEvent.click(await screen.findByTestId("lane-tools-menu"));
-    await userEvent.click(await screen.findByTestId("lane-sync-check"));
-    expect(await screen.findByTestId("lane-action-result")).toHaveTextContent("003_a.sql");
-  });
-
-  it("clicking Create/update readme opens the lane's terminal on the docs skill", async () => {
-    // Moved here from the Add-lane modal: a skill only runs inside a CLI
-    // session, and writing the docs is worth re-running long after creation.
-    vi.mocked(api.run.start).mockResolvedValue({} as never);
-    render(<LaneToolsMenu lane={makeLane({ cwd: "/work/demo" })} />);
-    await userEvent.click(await screen.findByTestId("lane-tools-menu"));
-    await userEvent.click(await screen.findByTestId("lane-write-docs"));
-    await waitFor(() =>
-      expect(api.run.start).toHaveBeenCalledWith({
-        laneId: 1,
-        cwd: "/work/demo",
-        initialPrompt: "/sg-all:sg-md-writing",
-      })
-    );
-  });
-
-  it("hides Create/update readme on a codex lane, which has no slash commands", async () => {
-    render(<LaneToolsMenu lane={makeLane({ tool: "codex" })} />);
-    await userEvent.click(await screen.findByTestId("lane-tools-menu"));
-    expect(await screen.findByTestId("lane-mcp-sync")).toBeInTheDocument();
-    expect(screen.queryByTestId("lane-write-docs")).not.toBeInTheDocument();
-  });
-
-  it("renders nothing when the lane has no profile", async () => {
-    vi.mocked(api.lanes.runtime).mockResolvedValue({ available: false });
-    const { container } = render(<LaneToolsMenu lane={makeLane()} />);
-    await waitFor(() => expect(api.lanes.runtime).toHaveBeenCalled());
-    expect(container).toBeEmptyDOMElement();
-  });
-});