feat(ui): call lanes "workspaces" in the UI, CLI output and docs

Copy-only rename (workspace redesign, phase 0). The word a user reads
changes — "Lane" → "Workspace", "Add lane" → "Add workspace" — in both
locales, in agenthub CLI prose and help, in the server's error messages
and in the docs. Every identifier stays: /api/lanes, `agenthub lanes`,
--lane, AGENTHUB_LANE_ID, error codes, tmux names, DB tables, file,
component and i18n key names. docs/LANES.md keeps its name, retitled
"Workspaces (lanes)".

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

@@ -243,7 +243,7 @@ describe("AddLaneModal — picking an existing branch (issue #34)", () => {
     await user.click(screen.getByRole("button", { name: "Existing branch" }));
     const select = await screen.findByLabelText("Branch to check out");
     await user.selectOptions(select, "feat/other");
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() =>
       expect(api.lanes.worktree).toHaveBeenCalledWith(
@@ -287,7 +287,7 @@ describe("AddLaneModal — picking an existing branch (issue #34)", () => {
       "Automatic — named from the title"
     );
 
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
     await waitFor(() =>
       expect(api.lanes.worktree).toHaveBeenCalledWith(
         expect.objectContaining({ branch: undefined, base: "main" })
@@ -301,7 +301,7 @@ describe("AddLaneModal — worktree mode (default)", () => {
   // the server name it" (issue #34).
   it("disables confirm until a repo, a title and a resolved branch list are all present", () => {
     renderModal();
-    expect(screen.getByRole("button", { name: "Add lane" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "Add workspace" })).toBeDisabled();
   });
 
   it("looks up branches once the repo path settles, and shows them as a picker", async () => {
@@ -337,7 +337,7 @@ describe("AddLaneModal — worktree mode (default)", () => {
     await waitFor(() => expect(api.lanes.branches).toHaveBeenCalled());
     expect(await screen.findByText(/Not a git repository/)).toBeInTheDocument();
     expect(screen.queryByLabelText("Branch to fork from")).toBeNull();
-    expect(screen.getByRole("button", { name: "Add lane" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "Add workspace" })).toBeDisabled();
   });
 
   it("refuses a worktree of a repo with no commits and steers to Repo mode", async () => {
@@ -355,11 +355,11 @@ describe("AddLaneModal — worktree mode (default)", () => {
     expect(await screen.findByText(/commit first, then publish/i)).toBeInTheDocument();
     await user.type(screen.getByLabelText("Title"), "demo");
     // There is nothing to branch from, so the worktree cannot be created.
-    expect(screen.getByRole("button", { name: "Add lane" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "Add workspace" })).toBeDisabled();
 
-    await user.click(screen.getByRole("button", { name: "Use as a Repo lane" }));
+    await user.click(screen.getByRole("button", { name: "Use as a Repo workspace" }));
     expect(screen.getByRole("button", { name: "Repo" })).toHaveAttribute("aria-pressed", "true");
-    expect(screen.getByRole("button", { name: "Add lane" })).toBeEnabled();
+    expect(screen.getByRole("button", { name: "Add workspace" })).toBeEnabled();
   });
 
   it("submits through the worktree provisioning endpoint, with the typed branch name", async () => {
@@ -375,7 +375,7 @@ describe("AddLaneModal — worktree mode (default)", () => {
     const user = userEvent.setup();
 
     await fillWorktreeForm(user, { title: "New feature", branch: "feat/new-feature" });
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() => {
       expect(api.lanes.worktree).toHaveBeenCalledWith({
@@ -407,7 +407,7 @@ describe("AddLaneModal — worktree mode (default)", () => {
     const user = userEvent.setup();
 
     await fillWorktreeForm(user, { title: "New feature" });
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     expect(await screen.findByText("EWORKTREEDIRCOLLISION")).toBeInTheDocument();
     expect(onClose).not.toHaveBeenCalled();
@@ -432,7 +432,7 @@ describe("AddLaneModal — worktree mode (default)", () => {
     const user = userEvent.setup();
 
     await fillWorktreeForm(user);
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() => expect(api.lanes.worktree).toHaveBeenCalled());
     await waitFor(() => expect(api.lanes.profileInit).toHaveBeenCalledWith(42));
@@ -457,7 +457,7 @@ describe("AddLaneModal — worktree mode (default)", () => {
     const user = userEvent.setup();
 
     await fillWorktreeForm(user, { title: "demo2" });
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() => expect(onAdded).toHaveBeenCalled());
     expect(onClose).not.toHaveBeenCalled();
@@ -478,14 +478,14 @@ describe("AddLaneModal — worktree mode (default)", () => {
     const user = userEvent.setup();
 
     await fillWorktreeForm(user, { title: "demo3" });
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     // A failure is the one case worth reading before the dialog goes away.
     expect(await screen.findByText("Setup")).toBeInTheDocument();
     expect(onClose).not.toHaveBeenCalled();
     // And then the primary button must close, not sit there disabled: the lane
     // already exists, so "Add lane" has nothing left to do.
-    expect(screen.queryByRole("button", { name: "Add lane" })).toBeNull();
+    expect(screen.queryByRole("button", { name: "Add workspace" })).toBeNull();
     await user.click(screen.getByRole("button", { name: "Close" }));
     expect(onClose).toHaveBeenCalled();
   });
@@ -510,7 +510,7 @@ describe("AddLaneModal — worktree mode (default)", () => {
     const user = userEvent.setup();
 
     await fillWorktreeForm(user, { title: "demo4" });
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() => expect(onAdded).toHaveBeenCalled());
     expect(await screen.findByText(/auto-setup was skipped/)).toBeInTheDocument();
@@ -525,12 +525,12 @@ describe("AddLaneModal — repo mode (adopt)", () => {
     const user = userEvent.setup();
     await user.click(screen.getByRole("button", { name: "Repo" }));
 
-    expect(screen.getByRole("button", { name: "Add lane" })).toBeDisabled();
+    expect(screen.getByRole("button", { name: "Add workspace" })).toBeDisabled();
     const dirField = screen.getByLabelText("Directory");
     await focusField(user, dirField);
     await user.type(dirField, "/Users/tester/projects/repo");
 
-    expect(screen.getByRole("button", { name: "Add lane" })).toBeEnabled();
+    expect(screen.getByRole("button", { name: "Add workspace" })).toBeEnabled();
     expect(screen.queryByLabelText("Branch to fork from")).toBeNull();
     expect(screen.queryByLabelText("New branch name")).toBeNull();
     expect(api.lanes.branches).not.toHaveBeenCalled();
@@ -551,7 +551,7 @@ describe("AddLaneModal — repo mode (adopt)", () => {
     await focusField(user, dirField);
     await user.type(dirField, "/Users/tester/projects/repo");
     await user.type(screen.getByLabelText("Title"), "main repo");
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() =>
       expect(api.lanes.ensure).toHaveBeenCalledWith({
@@ -582,9 +582,11 @@ describe("AddLaneModal — repo mode (adopt)", () => {
     const dirField = screen.getByLabelText("Directory");
     await focusField(user, dirField);
     await user.type(dirField, "/Users/tester/projects/repo");
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
-    expect(await screen.findByText(/already has a lane.*#3.*SG - Services/)).toBeInTheDocument();
+    expect(
+      await screen.findByText(/already has a workspace.*#3.*SG - Services/)
+    ).toBeInTheDocument();
     // The existing lane is selected so the user sees it, but nothing claims a new one.
     expect(onAdded).toHaveBeenCalledWith(expect.objectContaining({ id: 3 }));
     expect(onClose).not.toHaveBeenCalled();
@@ -625,7 +627,7 @@ describe("AddLaneModal — folder browse", () => {
 
     expect(screen.queryByRole("dialog", { name: "Browse for a folder" })).toBeNull();
     expect(
-      screen.getByRole("dialog", { name: "Create a lane from a working directory" })
+      screen.getByRole("dialog", { name: "Create a workspace from a working directory" })
     ).toBeInTheDocument();
     expect(onClose).not.toHaveBeenCalled();
   });
@@ -655,7 +657,7 @@ describe("AddLaneModal — AI Router", () => {
     const repoField = screen.getByLabelText("Directory");
     await focusField(user, repoField);
     await user.type(repoField, "/Users/tester/projects/repo");
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() => expect(api.lanes.routerApply).toHaveBeenCalledWith(9, "native"));
   });
@@ -674,7 +676,7 @@ describe("AddLaneModal — AI Router", () => {
     await focusField(user, repoField);
     await user.type(repoField, "/Users/tester/projects/repo");
     await user.click(await screen.findByRole("radio", { name: "AI Router" }));
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() => expect(api.lanes.routerApply).toHaveBeenCalledWith(9, "9router"));
   });
@@ -703,7 +705,7 @@ describe("AddLaneModal — AI Router", () => {
     const repoField = screen.getByLabelText("Directory");
     await focusField(user, repoField);
     await user.type(repoField, "/Users/tester/projects/repo");
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() => expect(api.lanes.ensure).toHaveBeenCalled());
   });
@@ -726,7 +728,7 @@ describe("AddLaneModal — a created lane is never lost to a setup failure", ()
     const repoField = screen.getByLabelText("Directory");
     await focusField(user, repoField);
     await user.type(repoField, "/Users/tester/projects/repo");
-    await user.click(screen.getByRole("button", { name: "Add lane" }));
+    await user.click(screen.getByRole("button", { name: "Add workspace" }));
 
     await waitFor(() => expect(onAdded).toHaveBeenCalled());
     // …and the failure is still surfaced, on a modal left open.
@@ -792,7 +794,7 @@ describe("AddLaneModal — tool selection", () => {
     const picker = await screen.findByRole("button", { name: /Claude Code.*Default/ });
     expect(picker).toHaveAttribute("aria-expanded", "false");
     await user.click(picker);
-    const list = screen.getByRole("group", { name: /Which CLI drives this lane/ });
+    const list = screen.getByRole("group", { name: /Which CLI drives this workspace/ });
     expect(
       within(list)
         .getAllByRole("button")
@@ -802,7 +804,7 @@ describe("AddLaneModal — tool selection", () => {
     // The picked tool replaces the default on the button, and the list closes.
     expect(screen.getByRole("button", { name: "Codex", expanded: false })).toBeInTheDocument();
     expect(screen.queryByRole("button", { name: "Gemini" })).toBeNull();
-    await user.click(screen.getByRole("button", { name: /add lane|create/i }));
+    await user.click(screen.getByRole("button", { name: /add workspace|create/i }));
 
     await waitFor(() =>
       expect(api.lanes.ensure).toHaveBeenCalledWith(expect.objectContaining({ tool: "codex" }))
@@ -842,7 +844,7 @@ describe("AddLaneModal — tool selection", () => {
     const dirField = screen.getByLabelText("Directory");
     await focusField(user, dirField);
     await user.type(dirField, "/tmp/demo");
-    await user.click(screen.getByRole("button", { name: /add lane|create/i }));
+    await user.click(screen.getByRole("button", { name: /add workspace|create/i }));
 
     await waitFor(() =>
       expect(api.lanes.ensure).toHaveBeenCalledWith(expect.objectContaining({ tool: "claude" }))

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

@@ -135,7 +135,7 @@ describe("DestructiveLaneModal", () => {
         onConfirm={onConfirm}
       />
     );
-    const confirmButton = await screen.findByRole("button", { name: "Delete lane record" });
+    const confirmButton = await screen.findByRole("button", { name: "Delete workspace record" });
     await waitFor(() => expect(confirmButton).not.toBeDisabled());
     // "adopted" is shown as context, not as a refusal.
     expect(screen.getByText(/Only the dashboard's record of it is dropped/)).toBeInTheDocument();
@@ -167,7 +167,7 @@ describe("DestructiveLaneModal", () => {
         onConfirm={onConfirm}
       />
     );
-    const confirmButton = await screen.findByRole("button", { name: "Delete lane record" });
+    const confirmButton = await screen.findByRole("button", { name: "Delete workspace record" });
     await waitFor(() => expect(confirmButton).not.toBeDisabled());
     expect(screen.queryByRole("checkbox")).not.toBeInTheDocument();
     fireEvent.click(confirmButton);
@@ -212,9 +212,9 @@ describe("DestructiveLaneModal", () => {
         onConfirm={onConfirm}
       />
     );
-    const confirmButton = await screen.findByRole("button", { name: "Delete lane record" });
+    const confirmButton = await screen.findByRole("button", { name: "Delete workspace record" });
     await waitFor(() => expect(confirmButton).not.toBeDisabled());
-    expect(screen.getByText(/The lane directory is already gone/)).toBeInTheDocument();
+    expect(screen.getByText(/The workspace directory is already gone/)).toBeInTheDocument();
     fireEvent.click(confirmButton);
     expect(onConfirm).toHaveBeenCalledWith({
       expect: { head: null, dirty: 0, untracked: 0, unpushed: 0 },
@@ -259,7 +259,7 @@ describe("DestructiveLaneModal", () => {
         onConfirm={onConfirm}
       />
     );
-    const confirmButton = await screen.findByRole("button", { name: "Delete lane record" });
+    const confirmButton = await screen.findByRole("button", { name: "Delete workspace record" });
     await waitFor(() => expect(confirmButton).not.toBeDisabled());
     expect(screen.getByText(/cannot be read as a Git worktree/)).toBeInTheDocument();
     fireEvent.click(confirmButton);
@@ -289,7 +289,7 @@ describe("DestructiveLaneModal", () => {
         onConfirm={onConfirm}
       />
     );
-    const confirmButton = await screen.findByRole("button", { name: "Delete lane record" });
+    const confirmButton = await screen.findByRole("button", { name: "Delete workspace record" });
     await waitFor(() => expect(confirmButton).not.toBeDisabled());
     expect(screen.queryByRole("checkbox")).not.toBeInTheDocument();
     fireEvent.click(confirmButton);

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

@@ -207,7 +207,7 @@ describe("LaneChangesPanel", () => {
     });
     render(<LaneChangesPanel laneId={7} />);
     expect(
-      await screen.findByText("This lane's directory is not a readable git repository.")
+      await screen.findByText("This workspace's directory is not a readable git repository.")
     ).toBeInTheDocument();
   });
 

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

@@ -197,7 +197,7 @@ describe("LaneGitBar", () => {
     );
 
     await user.selectOptions(screen.getByLabelText("Switch branch…"), "development");
-    await user.click(screen.getByRole("button", { name: "New lane here" }));
+    await user.click(screen.getByRole("button", { name: "New workspace here" }));
     expect(onNewLane).toHaveBeenCalledWith("development");
   });
 
@@ -215,7 +215,7 @@ describe("LaneGitBar", () => {
     render(<LaneGitBar laneId={3} git={facts()} onChanged={vi.fn()} onNewLane={vi.fn()} />);
     await user.click(screen.getByRole("button", { name: /Branch/ }));
     const select = await screen.findByLabelText("Switch branch…");
-    const newLane = () => screen.getByRole("button", { name: "New lane here" });
+    const newLane = () => screen.getByRole("button", { name: "New workspace here" });
 
     // This lane's own branch: its worktree is this lane.
     await user.selectOptions(select, "feat/thing");
@@ -287,7 +287,7 @@ describe("LaneGitBar", () => {
       worktrees: [{ path: "/repo/dev", branch: "development" }],
     });
     await user.selectOptions(select, "development");
-    const newLane = screen.getByRole("button", { name: "New lane here" });
+    const newLane = screen.getByRole("button", { name: "New workspace here" });
     expect(newLane).toBeEnabled();
     expect(newLane).not.toHaveAttribute("title", expect.stringContaining("/repo/dev"));
   });

client/src/components/run/LaneConsolePane.tsx

@@ -425,7 +425,7 @@ export function LaneConsolePane({
 
           const startedId = laneStartResult.run_id ?? laneStartResult.lane?.run_id;
           if (!startedId) {
-            throw new Error("No run_id returned from lane start");
+            throw new Error(t("errors.noRunIdReturned"));
           }
 
           fetched = await api.run.get(startedId);