feat(lanes): Antigravity lanes, release exited panes, fresh Codex starts

- antigravity: a third lane tool running Antigravity's `agy` CLI. `-i`
  carries the first prompt, `--continue` resumes; `agy` has no model,
  effort or permission flag, and `--dangerously-skip-permissions` is never
  emitted. No pipeline, no agents install, and no AI Router (native only,
  else EUNSUPPORTED). Add lane gains an Antigravity choice and the binary
  probe maps it to `agy`.
- UI: the lane card no longer renders a frame holding only a "Codex" chip,
  and the prompt box names the lane's CLI ("Ask Codex anything…"), via
  LANE_TOOL_LABEL.
- runs: a pane that exits is released on a 10 s server beat
  (healAllRunIds, DASHBOARD_RUN_HEAL_MS). Codex and Antigravity fire no
  hook, so their lanes stayed "running" until something re-read them.
- codex: Start no longer sends resumeLast — only "Resume last session"
  continues the previous thread.

client/src/components/lanes/AddLaneModal.tsx

@@ -429,6 +429,15 @@ export function AddLaneModal({
               label={t("addLaneToolCodex")}
               onClick={() => setTool("codex")}
             />
+            <Seg
+              active={tool === "antigravity"}
+              label={t("addLaneToolAntigravity")}
+              onClick={() => {
+                setTool("antigravity");
+                // `agy` cannot run behind an AI Router (see router-apply.js).
+                setRouter("native");
+              }}
+            />
           </div>
         </div>
 
@@ -635,7 +644,10 @@ export function AddLaneModal({
             hid it. The pipeline picker is gone entirely: every lane is created
             on `default` (the server's own default) and the template is changed
             from the lane's own header afterwards. */}
-        <div className="rounded-md border border-border-light bg-surface-0 p-2">
+        <div
+          className="rounded-md border border-border-light bg-surface-0 p-2"
+          hidden={tool === "antigravity"}
+        >
           <div>
             <fieldset>
               <legend className="mb-1 text-xs text-fg-secondary">{t("addLaneRouterLabel")}</legend>

client/src/components/lanes/LaneCard.tsx

@@ -363,8 +363,8 @@ 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: a codex lane has no agents to install. */}
-          {lane.tool !== "codex" && (
+          {/* Claude-only: other CLIs have no agents to install. */}
+          {lane.tool === "claude" && (
             <button
               type="button"
               role="menuitem"
@@ -379,7 +379,7 @@ export function LaneToolsMenu({ lane }: { lane: Lane }) {
               {t("actions.agentsInstall")}
             </button>
           )}
-          {lane.tool !== "codex" && (
+          {lane.tool === "claude" && (
             <button
               type="button"
               role="menuitem"
@@ -487,18 +487,11 @@ export default function LaneCard({
         // renders no frame at all rather than an empty box.
         className="flex flex-col rounded-lg border border-border bg-surface-4 p-2.5 transition-colors hover:border-border-light empty:hidden"
       >
-        {(lane.ci_status || lane.tool === "codex") && (
+        {lane.ci_status && (
           <div className="mb-2 flex flex-wrap items-center gap-1.5 text-[11px]">
-            {lane.ci_status && (
-              <span className="rounded bg-surface-2 px-1.5 py-0.5 text-fg-secondary">
-                CI {lane.ci_status}
-              </span>
-            )}
-            {lane.tool === "codex" && (
-              <span className="rounded border border-border bg-surface-2 px-1.5 py-0.5 text-[10px] text-fg-muted">
-                Codex
-              </span>
-            )}
+            <span className="rounded bg-surface-2 px-1.5 py-0.5 text-fg-secondary">
+              CI {lane.ci_status}
+            </span>
           </div>
         )}
 

client/src/components/lanes/LaneStripCard.tsx

@@ -18,6 +18,7 @@
 import { useState } from "react";
 import { useTranslation } from "react-i18next";
 import type { Lane } from "../../lib/types";
+import { LANE_TOOL_LABEL } from "../../lib/types";
 
 const LIVENESS_DOT: Record<Lane["liveness"], string> = {
   active: "bg-status-success",
@@ -115,18 +116,18 @@ export default function LaneStripCard({
         <span className="shrink-0 text-[10px] font-semibold tracking-widest text-fg-muted">
           #{lane.id}
         </span>
-        {/* Codex lanes carry no pipeline, so no stage chip — the Codex tag
-            takes its place. */}
-        {lane.tool === "codex" ? (
+        {/* Only claude lanes carry a pipeline; the others show their CLI's
+            tag in place of the stage chip. */}
+        {lane.tool !== "claude" ? (
           <span className="shrink-0 rounded border border-border bg-surface-2 px-1.5 py-0.5 text-[10px] text-fg-muted">
-            Codex
+            {LANE_TOOL_LABEL[lane.tool]}
           </span>
         ) : (
           <span className="truncate rounded bg-surface-4 px-1.5 py-0.5 text-fg-secondary">
             {lane.stage}
           </span>
         )}
-        {lane.tool !== "codex" && detectionLeads(lane) && (
+        {lane.tool === "claude" && detectionLeads(lane) && (
           <span
             data-testid={`lane-tile-auto-${lane.id}`}
             title={lane.detected_signal || undefined}

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

@@ -96,13 +96,16 @@ function makeLane(overrides: Partial<Lane> = {}): Lane {
 }
 
 describe("LaneCard lane tool badge", () => {
-  it("badges a codex lane and leaves a claude lane unbadged", () => {
-    const { rerender } = render(
-      <LaneCard {...{ lane: makeLane({ tool: "codex" }), onAction: vi.fn() }} />
-    );
-    expect(screen.getByText("Codex")).toBeInTheDocument();
-    rerender(<LaneCard {...{ lane: makeLane({ tool: "claude" }), onAction: vi.fn() }} />);
-    expect(screen.queryByText("Codex")).not.toBeInTheDocument();
+  // The strip tile already names the CLI; a card holding only that tag was an
+  // empty frame in the lane detail.
+  it("renders nothing for a codex or antigravity lane with nothing else to show", () => {
+    for (const tool of ["codex", "antigravity"] as const) {
+      const { container, unmount } = render(
+        <LaneCard {...{ lane: makeLane({ tool }), onAction: vi.fn() }} />
+      );
+      expect(container.querySelector('[data-testid="lane-card-1"]')).toBeEmptyDOMElement();
+      unmount();
+    }
   });
 });
 

client/src/components/run/LaneConsolePane.tsx

@@ -44,6 +44,7 @@ import type {
   CodexApproval,
 } from "../../lib/api";
 import type { Session, Lane, LaneTool } from "../../lib/types";
+import { LANE_TOOL_LABEL } from "../../lib/types";
 import { TerminalView } from "./TerminalView";
 import { RunSetup } from "./RunSetup";
 import { ActiveRunsSwitcher } from "./RunHistory";
@@ -149,7 +150,7 @@ export function LaneConsolePane({
         : (externalSessions ?? []).filter((s) => s.cwd && owningLaneId(s.cwd, lanes) === laneId),
     [externalSessions, laneId, lanes]
   );
-  const toolLabel = laneTool === "codex" ? "Codex" : "Claude";
+  const toolLabel = LANE_TOOL_LABEL[laneTool];
 
   useEffect(() => {
     onHasActiveRunChange?.(handle !== null);
@@ -568,7 +569,12 @@ export function LaneConsolePane({
       {binaryStatus && !binaryStatus[laneTool]?.found && (
         <div className="rounded-lg border border-status-danger/40 bg-status-danger/10 px-4 py-3 text-sm text-status-danger flex items-center gap-2">
           <AlertCircle className="w-4 h-4 flex-shrink-0" />
-          <span>{t("binary.missing", { cli: laneTool, tool: toolLabel })}</span>
+          <span>
+            {t("binary.missing", {
+              cli: laneTool === "antigravity" ? "agy" : laneTool,
+              tool: toolLabel,
+            })}
+          </span>
         </div>
       )}
 

client/src/components/run/RunSetup.tsx

@@ -56,6 +56,7 @@ import type {
   CcMdItem,
 } from "../../lib/api";
 import type { Session, LaneTool } from "../../lib/types";
+import { LANE_TOOL_LABEL } from "../../lib/types";
 import { Select } from "../Select";
 
 export interface SlashCommand {
@@ -430,10 +431,13 @@ export function RunSetup(props: RunSetupProps) {
               </div>
             )}
           </Field>
-          <Field label={t("fields.model")}>
-            <ModelPicker value={props.model} onChange={props.onModelChange} tool={props.tool} />
-          </Field>
-          {props.tool === "codex" ? (
+          {/* `agy` takes no model, permission or effort flag. */}
+          {props.tool !== "antigravity" && (
+            <Field label={t("fields.model")}>
+              <ModelPicker value={props.model} onChange={props.onModelChange} tool={props.tool} />
+            </Field>
+          )}
+          {props.tool === "antigravity" ? null : props.tool === "codex" ? (
             <>
               <Field label={t("fields.sandbox")}>
                 <Select<CodexSandbox>
@@ -472,17 +476,19 @@ export function RunSetup(props: RunSetupProps) {
               />
             </Field>
           )}
-          <Field label={t("fields.effort")}>
-            <Select<EffortLevel>
-              value={props.effort}
-              onChange={props.onEffortChange}
-              options={RUN_EFFORT_CHOICES.map((c) => ({
-                value: c.id,
-                label: c.label,
-                hint: c.hint,
-              }))}
-            />
-          </Field>
+          {props.tool !== "antigravity" && (
+            <Field label={t("fields.effort")}>
+              <Select<EffortLevel>
+                value={props.effort}
+                onChange={props.onEffortChange}
+                options={RUN_EFFORT_CHOICES.map((c) => ({
+                  value: c.id,
+                  label: c.label,
+                  hint: c.hint,
+                }))}
+              />
+            </Field>
+          )}
         </div>
         <div className="flex shrink-0 items-center rounded-md border border-border bg-surface-2 p-0.5 text-[11.5px]">
           <Seg
@@ -542,9 +548,9 @@ export function RunSetup(props: RunSetupProps) {
           value={props.prompt}
           onChange={props.onPromptChange}
           onSubmit={() => handleStart(props)}
-          placeholder={t("fields.promptPlaceholderTerminal")}
+          placeholder={t("fields.promptPlaceholderTerminal", { tool: LANE_TOOL_LABEL[props.tool] })}
           rows={5}
-          slash={props.tool !== "codex"}
+          slash={props.tool === "claude"}
           fileCwd={props.resumeSession?.cwd || props.cwd}
         />
         <div className="mt-1 text-[10px] text-fg-muted">
@@ -609,18 +615,18 @@ export function RunSetup(props: RunSetupProps) {
 function handleStart(props: RunSetupProps, session?: Session) {
   const resume = session ?? props.resumeSession;
   const codex = props.tool === "codex";
+  const agy = props.tool === "antigravity";
   props.onStart({
     laneId: props.laneId,
     // A resume is pinned to its own session's folder — that's what the locked
     // cwd field shows, so it's what gets sent.
     cwd: resume?.cwd || props.cwd || undefined,
-    model: props.model || undefined,
-    permissionMode: codex ? undefined : props.permissionMode || undefined,
+    model: agy ? undefined : props.model || undefined,
+    permissionMode: codex || agy ? undefined : props.permissionMode || undefined,
     sandbox: codex ? props.sandbox : undefined,
     approval: codex ? props.approval : undefined,
-    effort: props.effort || undefined,
-    resumeSessionId: codex ? undefined : resume?.id || undefined,
-    resumeLast: codex && !resume ? true : undefined,
+    effort: agy ? undefined : props.effort || undefined,
+    resumeSessionId: codex || agy ? undefined : resume?.id || undefined,
     // A resume continues a session that already has its own history — sending
     // whatever is sitting in the prompt box would fire an extra turn nobody
     // asked for, so a resume carries no prompt at all.

client/src/components/run/__tests__/LaneConsolePane.test.tsx

@@ -84,6 +84,7 @@ function baseProps() {
     binaryStatus: {
       claude: { found: true, path: "/usr/local/bin/claude" },
       codex: { found: true, path: "/usr/local/bin/codex" },
+      antigravity: { found: true, path: "/usr/local/bin/agy" },
     },
     cwdSuggestions: [],
     activeRuns: { items: [] },

client/src/components/run/__tests__/RunSetup.test.tsx

@@ -380,7 +380,7 @@ describe("RunSetup — per-tool fields", () => {
 });
 
 describe("RunSetup — / and @ suggestions in the prompt box", () => {
-  const box = () => screen.getByPlaceholderText(i18n.t("run:fields.promptPlaceholderTerminal"));
+  const box = () => screen.getByPlaceholderText(/ anything…$/);
 
   it("lists the lane's commands, skills and the CLI built-ins on /, and Enter picks one", async () => {
     const { spies } = renderSetup({ prompt: "" });
@@ -423,3 +423,26 @@ describe("RunSetup — / and @ suggestions in the prompt box", () => {
     expect(api.ccConfig.commands).not.toHaveBeenCalled();
   });
 });
+
+describe("RunSetup — antigravity lanes", () => {
+  it("names the lane's CLI in the prompt box and drops the flags `agy` lacks", () => {
+    const { spies } = renderSetup({ tool: "antigravity", model: "opus", effort: "high" });
+    expect(screen.getByPlaceholderText("Ask Antigravity anything…")).toBeTruthy();
+    expect(screen.queryByText(i18n.t("run:fields.model"))).toBeNull();
+    expect(screen.queryByText(i18n.t("run:fields.effort"))).toBeNull();
+
+    fireEvent.click(screen.getByText(i18n.t("run:actions.start")));
+    expect(spies.onStart).toHaveBeenCalledWith(
+      expect.objectContaining({ model: undefined, effort: undefined, permissionMode: undefined })
+    );
+  });
+});
+
+describe("RunSetup — codex lanes", () => {
+  it("starts a fresh codex run instead of resuming the last one", () => {
+    const { spies } = renderSetup({ tool: "codex" });
+    fireEvent.click(screen.getByText(i18n.t("run:actions.start")));
+    expect(spies.onStart).toHaveBeenCalledOnce();
+    expect(spies.onStart.mock.calls[0][0].resumeLast).toBeUndefined();
+  });
+});