refactor(lanes): drop the workflow skills and Superpowers link; pipelines go dormant

The plugin stops shipping its workflow layer:
- skills/ship-feature and skills/ship-feature-lane, the 18 stage/ship slash
  commands (plugin.json keeps agenthub-doctor/update/open), and all four
  agents/ (qc-local, senior-gate-reviewer, backend-reviewer, frontend-reviewer).
- CLI `agenthub skills install`, `agenthub lanes agents install`,
  `agenthub ship-full|ship-quick`; routes POST /api/skills/install and
  POST /api/lanes/:id/agents/install; the Settings button, the lane Tools
  menu item and the Add-lane setup step that called them.
- The Superpowers auto-install: server/lib/skill-plugins.js, the bootstrap's
  autoInstallSkillPlugins / skillPluginsSettled gate and the doctor row.

Pipelines are kept but dormant: server/data/pipelines/ is deleted, so no
template ships. `default` resolves to EMPTY_PIPELINE (no nodes, progress 0),
createLane still accepts it, POST /api/lanes/:id/stage answers 400
ENOPIPELINE, and the Workspace hides the stage timer, pickers, PipelineMap
and strip stage chip for a lane with no nodes. A template dropped into
DASHBOARD_PIPELINES_DIR turns it all back on. The server suite loads its
templates from server/__tests__/fixtures/pipelines/.

Docs: CLAUDE.md (marker, retired rules), README(.vi), INSTALL, ARCHITECTURE,
docs/LANES|PLUGINS|CLI|API, agenthub-introduction.html.

client/src/components/lanes/AddLaneModal.tsx

@@ -115,7 +115,6 @@ export function AddLaneModal({
   const [browseOpen, setBrowseOpen] = useState(false);
   const [setupResult, setSetupResult] = useState<{
     profile: "scaffolded" | "skipped" | "failed";
-    agents: "ok" | "failed";
     mcp: "ok" | "failed";
     router: "ok" | "skipped" | "failed";
   } | null>(null);
@@ -294,7 +293,7 @@ export function AddLaneModal({
       // POST /worktree returns as soon as the DB row exists (202) — the
       // actual `git worktree add` runs afterward, in the background, on the
       // server. Firing setup against the lane's cwd before that finishes
-      // means agents/mcp write into a directory that doesn't exist yet, so
+      // means mcp writes into a directory that doesn't exist yet, so
       // wait for provisioning to leave the "provisioning" status first.
       const provisionedLane = await waitForProvisioned(result.lane.id);
       if (!provisionedLane || provisionedLane.status === "failed") {
@@ -303,9 +302,8 @@ export function AddLaneModal({
         return;
       }
 
-      const [profileOutcome, agentsOutcome, mcpOutcome, routerOutcome] = await Promise.allSettled([
+      const [profileOutcome, mcpOutcome, routerOutcome] = await Promise.allSettled([
         api.lanes.profileInit(result.lane.id),
-        api.lanes.agentsInstall(result.lane.id),
         api.lanes.mcpSync(result.lane.id),
         applyRouter(result.lane.id),
       ]);
@@ -316,7 +314,6 @@ export function AddLaneModal({
               ? "scaffolded"
               : "skipped"
             : "failed",
-        agents: agentsOutcome.status === "fulfilled" ? "ok" : "failed",
         mcp: mcpOutcome.status === "fulfilled" ? "ok" : "failed",
         router:
           routerOutcome.status !== "fulfilled" ? "failed" : router === "native" ? "skipped" : "ok",
@@ -328,7 +325,6 @@ export function AddLaneModal({
         console.info("[add-lane] auto-setup result:", {
           profile:
             profileOutcome.status === "fulfilled" ? profileOutcome.value : profileOutcome.reason,
-          agents: agentsOutcome.status === "fulfilled" ? agentsOutcome.value : agentsOutcome.reason,
           mcp: mcpOutcome.status === "fulfilled" ? mcpOutcome.value : mcpOutcome.reason,
           // Never the profile itself: it would put an endpoint and a lane id in
           // the browser console. (The key is never sent here at all.)
@@ -740,7 +736,6 @@ export function AddLaneModal({
                   ok: setupResult.profile !== "failed",
                   skipped: setupResult.profile === "skipped",
                 },
-                { label: t("addLaneSetupAgents"), ok: setupResult.agents === "ok" },
                 { label: t("addLaneSetupMcp"), ok: setupResult.mcp === "ok" },
                 {
                   label: t("addLaneSetupRouter"),

client/src/components/lanes/LaneCard.tsx

@@ -271,7 +271,7 @@ export function since(sec: number | null): string {
 }
 
 /**
- * Repo tooling (agents install / MCP sync / dev-sync check, and the
+ * Repo tooling (MCP sync / dev-sync check, and the
  * create/update-readme run, which moved here from the Add-lane modal) for one lane,
  * collapsed into a single dropdown. Lives outside LaneCard so it can be
  * placed in the Workspace page header, next to "Add lane" — it polls its
@@ -281,16 +281,11 @@ export function since(sec: number | null): string {
 export function LaneToolsMenu({ lane }: { lane: Lane }) {
   const { t } = useTranslation(["lanes"]);
   const [toolsMenuOpen, setToolsMenuOpen] = useState(false);
-  const [laneActionBusy, setLaneActionBusy] = useState<
-    "agents" | "mcp" | "sync-check" | "docs" | null
-  >(null);
+  const [laneActionBusy, setLaneActionBusy] = useState<"mcp" | "sync-check" | "docs" | null>(null);
   const [laneActionResult, setLaneActionResult] = useState<string | null>(null);
   const runtime = useLaneRuntime(lane.id, 0);
 
-  const runLaneAction = async (
-    which: "agents" | "mcp" | "sync-check" | "docs",
-    fn: () => Promise<string>
-  ) => {
+  const runLaneAction = async (which: "mcp" | "sync-check" | "docs", fn: () => Promise<string>) => {
     setLaneActionBusy(which);
     setLaneActionResult(null);
     try {
@@ -302,12 +297,6 @@ export function LaneToolsMenu({ lane }: { lane: Lane }) {
     }
   };
 
-  const handleAgentsInstall = () =>
-    runLaneAction("agents", async () => {
-      const result = await api.lanes.agentsInstall(lane.id);
-      return t("actions.agentsInstallResult", { files: result.installed.join(", ") });
-    });
-
   // A skill only exists inside a CLI session, so there is nothing server-side
   // to call: this opens the lane's own terminal run with the slash command as
   // its first message. Claude-only — codex has no slash commands.
@@ -363,22 +352,6 @@ export function LaneToolsMenu({ lane }: { lane: Lane }) {
           role="menu"
           className="absolute right-0 z-10 mt-1 min-w-44 overflow-hidden rounded-md border border-border-light bg-surface-0 py-1 shadow-lg shadow-black/40"
         >
-          {/* Claude-only: other CLIs have no agents to install. */}
-          {lane.tool === "claude" && (
-            <button
-              type="button"
-              role="menuitem"
-              data-testid="lane-agents-install"
-              onClick={(e) => {
-                e.stopPropagation();
-                setToolsMenuOpen(false);
-                void handleAgentsInstall();
-              }}
-              className="block w-full px-3 py-1.5 text-left text-fg-secondary hover:bg-surface-2"
-            >
-              {t("actions.agentsInstall")}
-            </button>
-          )}
           {lane.tool === "claude" && (
             <button
               type="button"

client/src/components/lanes/LaneStripCard.tsx

@@ -42,7 +42,7 @@ const LIVENESS_DOT: Record<Lane["liveness"], string> = {
  * recordDetection refuses any detection that isn't strictly ahead.
  */
 function detectionLeads(lane: Lane): boolean {
-  if (!lane.detected_stage) return false;
+  if (!lane.detected_stage || !lane.pipeline_nodes.length) return false;
   const nodes = lane.pipeline_nodes;
   return (
     nodes.findIndex((n) => n.id === lane.detected_stage) >=
@@ -116,9 +116,9 @@ export default function LaneStripCard({
         <span className="shrink-0 text-[10px] font-semibold tracking-widest text-fg-muted">
           #{lane.id}
         </span>
-        {/* Only claude lanes carry a pipeline; the others show their CLI's
-            tag in place of the stage chip. */}
-        {lane.tool !== "claude" ? (
+        {/* Only claude lanes carry a pipeline, and only while a template is
+            installed; the others show their CLI's tag in place of the stage chip. */}
+        {lane.tool !== "claude" || lane.pipeline_nodes.length === 0 ? (
           <span className="shrink-0 rounded border border-border bg-surface-2 px-1.5 py-0.5 text-[10px] text-fg-muted">
             {LANE_TOOL_LABEL[lane.tool]}
           </span>

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

@@ -27,7 +27,6 @@ vi.mock("../../../lib/api", () => ({
       browse: vi.fn(),
       get: vi.fn(),
       profileInit: vi.fn(),
-      agentsInstall: vi.fn(),
       mcpSync: vi.fn(),
       routerApply: vi.fn(),
     },
@@ -120,7 +119,6 @@ beforeEach(() => {
   vi.mocked(api.lanes.profileInit)
     .mockReset()
     .mockResolvedValue({ scaffolded: false, reason: "no detectable Node.js project" });
-  vi.mocked(api.lanes.agentsInstall).mockReset().mockResolvedValue({ installed: [] });
   vi.mocked(api.lanes.mcpSync).mockReset().mockResolvedValue({ servers: [], profilesSeeded: [] });
   vi.mocked(api.lanes.routerApply).mockReset().mockResolvedValue({
     tool: "claude",
@@ -383,7 +381,7 @@ describe("AddLaneModal — worktree mode (default)", () => {
     expect(screen.queryByRole("dialog")).toBeNull();
   });
 
-  it("fires profileInit, agentsInstall, and mcpSync after a successful worktree call", async () => {
+  it("fires profileInit and mcpSync after a successful worktree call", async () => {
     vi.mocked(api.lanes.branches).mockResolvedValue({
       branches: ["main"],
       current: "main",
@@ -401,7 +399,6 @@ describe("AddLaneModal — worktree mode (default)", () => {
 
     await waitFor(() => expect(api.lanes.worktree).toHaveBeenCalled());
     await waitFor(() => expect(api.lanes.profileInit).toHaveBeenCalledWith(42));
-    expect(api.lanes.agentsInstall).toHaveBeenCalledWith(42);
     expect(api.lanes.mcpSync).toHaveBeenCalledWith(42);
     await waitFor(() => expect(onAdded).toHaveBeenCalled());
   });
@@ -416,7 +413,6 @@ describe("AddLaneModal — worktree mode (default)", () => {
       lane: { id: 43, title: "demo2", cwd: "/lanes/demo2", status: "provisioning" } as Lane,
     });
     vi.mocked(api.lanes.profileInit).mockRejectedValue(new Error("boom"));
-    vi.mocked(api.lanes.agentsInstall).mockRejectedValue(new Error("boom"));
     vi.mocked(api.lanes.mcpSync).mockRejectedValue(new Error("boom"));
     const onAdded = vi.fn();
     const onClose = vi.fn();
@@ -482,7 +478,6 @@ describe("AddLaneModal — worktree mode (default)", () => {
     await waitFor(() => expect(onAdded).toHaveBeenCalled());
     expect(await screen.findByText(/auto-setup was skipped/)).toBeInTheDocument();
     expect(api.lanes.profileInit).not.toHaveBeenCalled();
-    expect(api.lanes.agentsInstall).not.toHaveBeenCalled();
     expect(api.lanes.mcpSync).not.toHaveBeenCalled();
   });
 });

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

@@ -23,7 +23,6 @@ vi.mock("../../../lib/api", () => ({
       up: vi.fn(),
       down: vi.fn(),
       preflight: vi.fn().mockResolvedValue({ blocked: [], warnings: [] }),
-      agentsInstall: vi.fn(),
       mcpSync: vi.fn(),
       syncBaseCheck: vi.fn(),
       routerApply: vi.fn(),
@@ -309,17 +308,6 @@ describe("LaneToolsMenu", () => {
     } as unknown as LaneRuntime);
   });
 
-  it("clicking Install agents calls the API and shows the result", async () => {
-    vi.mocked(api.lanes.agentsInstall).mockResolvedValue({
-      installed: ["qc-local.md", "senior-gate-reviewer.md"],
-    });
-    render(<LaneToolsMenu lane={makeLane()} />);
-    await userEvent.click(await screen.findByTestId("lane-tools-menu"));
-    await userEvent.click(await screen.findByTestId("lane-agents-install"));
-    await waitFor(() => expect(api.lanes.agentsInstall).toHaveBeenCalledWith(1));
-    expect(await screen.findByTestId("lane-action-result")).toHaveTextContent("qc-local.md");
-  });
-
   it("clicking Sync MCP calls the API and shows the result", async () => {
     vi.mocked(api.lanes.mcpSync).mockResolvedValue({
       servers: ["playwright"],