test(lanes): stop lane-lifecycle from leaking real tmux + claude processes

Four cases in lane-lifecycle.test.js call /start without stubbing PATH,
so they spawn the real system `claude` binary in a real tmux session
to simulate a stuck/live run. Each then mocks tmux's own exec calls to
fake has-session/kill-session for the app's checks, but never touches
the real spawned process — the mock only fools the app, not the OS.
Two of these leaked past every prior test run undetected (ccam-lane-22,
ccam-lane-24), surfacing in the dashboard's live "Dashboard runs" list
with no DB record and a garbage started_at, and reappearing in a
Workspace split pane pointed at a deleted temp directory.

Stub a lightweight fake `claude` on PATH (same pattern already used
correctly elsewhere in this file) instead of spawning the real CLI, and
explicitly kill the real tmux session in each test's teardown since the
app-level mock never reaches the OS process.

client/src/components/lanes/LaneStripCard.tsx

@@ -1,9 +1,9 @@
 /**
- * @file The compact lane tile used in the Workspace carousel. It carries only
+ * @file The compact lane tile used in the Workspace's vertical lane list. It
- * what you need to pick a lane — which lane, is it alive, what stage, how far —
+ * carries only what you need to pick a lane — which lane, is it alive, what
- * because the full card, its controls and its working-copy facts live in the
+ * stage, how far — because the full card, its controls and its working-copy
- * detail panel below. Keeping the tile small is what lets a dozen lanes stay
+ * facts live in the detail panel beside it. Keeping the tile small and full
- * scannable in one horizontal row.
+ * width is what lets many lanes stay scannable in one scrolling column.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
@@ -42,7 +42,7 @@ export default function LaneStripCard({
       aria-pressed={selected}
       onClick={onSelect}
       title={lane.cwd}
-      className={`w-56 shrink-0 snap-start rounded-lg border p-3 text-left shadow-sm transition-colors ${
+      className={`w-full shrink-0 rounded-lg border p-3 text-left shadow-sm transition-colors ${
         selected
           ? "border-accent bg-accent/10"
           : "border-border bg-surface-2 hover:border-border-light hover:bg-surface-3"

client/src/i18n/locales/en/lanes.json

@@ -90,6 +90,8 @@
   "git.uncommitted": "{{dirty}} modified · {{untracked}} untracked",
   "kind.adopted": "adopted",
   "kind.managed": "managed",
+  "laneDetail.hide": "Hide details",
+  "laneDetail.show": "Lane details",
   "laneHeader": "Lane {{id}} · {{title}} · {{pipeline}}",
   "locks.held_one": "{{count}} lock held",
   "locks.held_other": "{{count}} locks held",

client/src/i18n/locales/vi/lanes.json

@@ -90,6 +90,8 @@
   "git.uncommitted": "{{dirty}} đã sửa · {{untracked}} chưa theo dõi",
   "kind.adopted": "đã nhận",
   "kind.managed": "được quản lý",
+  "laneDetail.hide": "Ẩn chi tiết",
+  "laneDetail.show": "Chi tiết lane",
   "laneHeader": "Làn đường {{id}} · {{title}} · {{pipeline}}",
   "locks.held_one": "Đang giữ {{count}} khóa",
   "locks.held_other": "Đang giữ {{count}} khóa",

client/src/pages/Workspace.tsx

@@ -54,39 +54,16 @@ import type { SplitViewState, SplitLayout } from "../lib/splitViewStorage";
 
 // ── Page ──────────────────────────────────────────────────────────────
 
-function ConsoleArea({
+function SplitLayoutToggle({
-  lanes,
-  selectedLaneId,
   splitView,
   setLayout,
-  setPaneLaneId,
-  binaryStatus,
-  cwdSuggestions,
-  activeRuns,
-  wsConnected,
-  defaultCwd,
-  onHasActiveRunChange,
-  onLaneCreated,
-  onLaneIdChange,
 }: {
-  lanes: Lane[];
-  selectedLaneId: number | null;
   splitView: SplitViewState;
   setLayout: (layout: SplitLayout) => void;
-  setPaneLaneId: (index: number, id: number) => void;
-  binaryStatus: { found: boolean; path: string | null } | null;
-  cwdSuggestions: CwdSuggestion[];
-  activeRuns: RunListResponse | null;
-  wsConnected: boolean;
-  defaultCwd: string;
-  onHasActiveRunChange: (val: boolean) => void;
-  onLaneCreated: (lane: Lane) => void;
-  onLaneIdChange: (id: number | null) => void;
 }) {
   const { t: tLanes } = useTranslation("lanes");
 
   return (
-    <>
     <div className="flex items-center gap-1.5">
       {([1, 2, 4] as const).map((n) => (
         <button
@@ -104,6 +81,43 @@ function ConsoleArea({
         </button>
       ))}
     </div>
+  );
+}
+
+function ConsoleArea({
+  lanes,
+  selectedLaneId,
+  splitView,
+  setLayout,
+  setPaneLaneId,
+  binaryStatus,
+  cwdSuggestions,
+  activeRuns,
+  wsConnected,
+  defaultCwd,
+  onHasActiveRunChange,
+  onLaneCreated,
+  onLaneIdChange,
+  showToggle = true,
+}: {
+  lanes: Lane[];
+  selectedLaneId: number | null;
+  splitView: SplitViewState;
+  setLayout: (layout: SplitLayout) => void;
+  setPaneLaneId: (index: number, id: number) => void;
+  binaryStatus: { found: boolean; path: string | null } | null;
+  cwdSuggestions: CwdSuggestion[];
+  activeRuns: RunListResponse | null;
+  wsConnected: boolean;
+  defaultCwd: string;
+  onHasActiveRunChange: (val: boolean) => void;
+  onLaneCreated: (lane: Lane) => void;
+  onLaneIdChange: (id: number | null) => void;
+  showToggle?: boolean;
+}) {
+  return (
+    <>
+      {showToggle && <SplitLayoutToggle splitView={splitView} setLayout={setLayout} />}
       {splitView.layout === 1 ? (
         <LaneConsolePane
           lanes={lanes}
@@ -175,6 +189,11 @@ export function Workspace() {
 
   // Split view state
   const [splitView, setSplitView] = useState<SplitViewState>(() => readSplitViewState());
+  // Info block (pickers, LaneCard, PipelineMap, proof gallery) is always shown
+  // in single-pane view; in split view it starts collapsed so tall content
+  // never crowds the pane grid, and the user expands it on demand.
+  const [infoExpanded, setInfoExpanded] = useState(false);
+  const showInfo = splitView.layout === 1 || infoExpanded;
 
   const setLayout = useCallback((layout: SplitLayout) => {
     setSplitView((prev) => {
@@ -420,7 +439,10 @@ export function Workspace() {
     try {
       const { lane } = await api.lanes.update(id, { pipeline });
       await refreshLanes();
-      if (!lane.pipeline_nodes.some((n) => n.state === "current")) {
+      // `stage` defaults to the DB sentinel "idle" until a driving session ever
+      // calls `ccam stage` — that's the normal state for most lanes and never
+      // matches a real pipeline node, so it isn't a mismatch worth surfacing.
+      if (lane.stage !== "idle" && !lane.pipeline_nodes.some((n) => n.state === "current")) {
         setLaneActionError(
           tLanes("pipelinePicker.stageMismatch", {
             stage: lane.stage,
@@ -488,11 +510,14 @@ export function Workspace() {
         </button>
       </div>
 
-      {/* Lane carousel: pick a lane here, read it below. Horizontal scroll with
+      {/* Lane list + detail live side by side so neither can cover the other:
-          snap so a dozen lanes stay in one row instead of a wall of cards. */}
+          the list is a scrolling column (holds any number of lanes), the
+          detail/console area to its right never has to compete with it for
+          vertical space. */}
+      <div className="flex min-h-0 flex-1 gap-4">
         <div
           data-testid="lane-strip"
-        className="flex snap-x snap-mandatory gap-2 overflow-x-auto pb-1"
+          className="flex w-60 shrink-0 flex-col gap-2 overflow-y-auto pr-1"
         >
           {lanes.map((l) => (
             <LaneStripCard
@@ -509,17 +534,42 @@ export function Workspace() {
           )}
         </div>
 
-      {/* The selected lane's pipeline, full width — the thing you actually
+        {/* The selected lane's pipeline — the thing you actually come to this
-          come to this page to read. */}
+            page to read, beside the list rather than stacked under it. */}
         {currentLane && (
-        <section data-testid="lane-detail" className="card p-4">
+          <section
+            data-testid="lane-detail"
+            className="flex min-h-0 min-w-0 flex-1 flex-col card p-4"
+          >
+            <div className="mb-3 flex flex-wrap items-center justify-between gap-2">
+              <span className="truncate text-sm font-semibold text-fg-primary">
+                {tLanes("laneHeader", {
+                  id: currentLane.id,
+                  title: currentLane.title || currentLane.cwd,
+                  pipeline: currentLane.pipeline_name,
+                })}
+              </span>
+              <div className="flex items-center gap-2">
+                {splitView.layout !== 1 && (
+                  <button
+                    type="button"
+                    data-testid="lane-detail-toggle"
+                    aria-expanded={infoExpanded}
+                    onClick={() => setInfoExpanded((v) => !v)}
+                    className="rounded border border-border-light px-2 py-1 text-xs text-fg-secondary transition-colors hover:text-fg-primary"
+                  >
+                    {infoExpanded ? tLanes("laneDetail.hide") : tLanes("laneDetail.show")}
+                  </button>
+                )}
+                <SplitLayoutToggle splitView={splitView} setLayout={setLayout} />
+              </div>
+            </div>
+            {showInfo && (
+              <div className="max-h-[45vh] shrink-0 overflow-y-auto">
                 <div className="mb-3 flex flex-wrap items-baseline gap-2">
                   <span className="text-[11px] font-semibold uppercase tracking-widest text-fg-muted">
                     {tLanes("cardId", { id: currentLane.id })}
                   </span>
-            <span className="truncate text-sm font-semibold text-fg-primary">
-              {currentLane.title || currentLane.cwd}
-            </span>
                   <select
                     data-testid="pipeline-picker"
                     aria-label={tLanes("pipelinePicker.label")}
@@ -592,7 +642,9 @@ export function Workspace() {
                 </div>
                 <div className="mb-3">
                   <PipelineMap
-              nodes={viewedFeature ? viewedFeature.pipeline_nodes : currentLane.pipeline_nodes}
+                    nodes={
+                      viewedFeature ? viewedFeature.pipeline_nodes : currentLane.pipeline_nodes
+                    }
                     detectedSignal={viewedFeature ? undefined : currentLane.detected_signal}
                   />
                   {viewedFeature && (
@@ -642,7 +694,9 @@ export function Workspace() {
                       ))}
                     </div>
                   )}
-          <div className="flex min-h-0 flex-col gap-2 border-t border-border pt-3">
+              </div>
+            )}
+            <div className="flex min-h-0 flex-1 flex-col gap-2 border-t border-border pt-3">
               <ConsoleArea
                 lanes={lanes}
                 selectedLaneId={selectedLaneId}
@@ -659,13 +713,14 @@ export function Workspace() {
                   setLanes((prev) => (prev.some((l) => l.id === lane.id) ? prev : [...prev, lane]))
                 }
                 onLaneIdChange={setSelectedLaneId}
+                showToggle={false}
               />
             </div>
           </section>
         )}
 
         {!currentLane && (
-        <div className="flex min-h-0 flex-col gap-2">
+          <div className="flex min-h-0 flex-1 flex-col gap-2">
             <ConsoleArea
               lanes={lanes}
               selectedLaneId={selectedLaneId}
@@ -685,6 +740,7 @@ export function Workspace() {
             />
           </div>
         )}
+      </div>
 
       <AddLaneModal
         open={addLaneOpen}

client/src/pages/__tests__/__snapshots__/screens.snapshot.test.tsx.snap

@@ -5762,7 +5762,10 @@ exports[`screen snapshots > Run 1`] = `
       </button>
     </div>
     <div
-      class="flex snap-x snap-mandatory gap-2 overflow-x-auto pb-1"
+      class="flex min-h-0 flex-1 gap-4"
+    >
+      <div
+        class="flex w-60 shrink-0 flex-col gap-2 overflow-y-auto pr-1"
         data-testid="lane-strip"
       >
         <p
@@ -5776,7 +5779,7 @@ exports[`screen snapshots > Run 1`] = `
         </p>
       </div>
       <div
-      class="flex min-h-0 flex-col gap-2"
+        class="flex min-h-0 flex-1 flex-col gap-2"
       >
         <div
           class="flex items-center gap-1.5"
@@ -6137,6 +6140,7 @@ exports[`screen snapshots > Run 1`] = `
       </div>
     </div>
   </div>
+</div>
 `;
 
 exports[`screen snapshots > Session detail 1`] = `

server/__tests__/lane-lifecycle.test.js

@@ -80,6 +80,29 @@ function makeRunChild({ exitsOnKill }) {
   return child;
 }
 
+// Puts a fake `claude` binary on PATH so a real `/start` spawns a real tmux
+// session running THIS script instead of the system Claude Code CLI. Tests
+// that mock tmux's own exec calls (to simulate a stuck/live session) still
+// spawn this real process underneath — without the stub, that spawn launches
+// the actual `claude` binary and, because the mock replaces the app's own
+// kill-session call, the real process is never actually terminated, leaking
+// a live tmux session + CLI process for good. Returns the restore function.
+function stubClaudeBinary(name) {
+  const bin = path.join(ROOT, `${name}-bin`);
+  const claude = path.join(bin, "claude");
+  fs.mkdirSync(bin, { recursive: true });
+  fs.writeFileSync(
+    claude,
+    "#!/usr/bin/env node\nprocess.on('SIGTERM', () => process.exit(0));\nsetInterval(() => {}, 1000);\n"
+  );
+  fs.chmodSync(claude, 0o755);
+  const originalPath = process.env.PATH;
+  process.env.PATH = `${bin}${path.delimiter}${originalPath}`;
+  return () => {
+    process.env.PATH = originalPath;
+  };
+}
+
 async function waitForProvisioning(id) {
   const deadline = Date.now() + 5000;
   let response;
@@ -818,6 +841,7 @@ describe("destructive lane lifecycle actions", () => {
     fs.writeFileSync(sentinel, "still here\n");
 
     // Start a run for the lane
+    const restorePath = stubClaudeBinary("await-timeout");
     const started = await request("POST", `/api/lanes/${lane.id}/start`, { prompt: "stuck" });
     assert.equal(started.status, 200);
     const runId = started.body.lane.run_id;
@@ -848,6 +872,15 @@ describe("destructive lane lifecycle actions", () => {
       assert.equal(fs.readFileSync(sentinel, "utf8"), "still here\n");
     } finally {
       tmux.__reset();
+      // The mocked kill-session above only fools the app's own check — the
+      // real tmux session + claude stub spawned above is still alive and
+      // must be killed for real, or it leaks past this test run.
+      try {
+        execFileSync("tmux", ["kill-session", "-t", runId], { stdio: "ignore" });
+      } catch {
+        // already gone
+      }
+      restorePath();
     }
     await request("DELETE", `/api/lanes/${lane.id}`);
   });
@@ -889,6 +922,7 @@ describe("destructive lane lifecycle actions", () => {
     const lane = await createManagedLane("start-twice");
 
     // Start a run for the lane
+    const restorePath = stubClaudeBinary("start-twice");
     const started = await request("POST", `/api/lanes/${lane.id}/start`, { prompt: "first" });
     assert.equal(started.status, 200);
     const runId = started.body.lane.run_id;
@@ -915,6 +949,15 @@ describe("destructive lane lifecycle actions", () => {
       assert.equal(after.body.lane.run_id, runId);
     } finally {
       tmux.__reset();
+      // The real tmux session behind the "first" run is never reset/killed
+      // in this test, mocked or otherwise — kill it for real so it doesn't
+      // leak past this test run.
+      try {
+        execFileSync("tmux", ["kill-session", "-t", runId], { stdio: "ignore" });
+      } catch {
+        // already gone
+      }
+      restorePath();
     }
 
     await request("DELETE", `/api/lanes/${lane.id}`);
@@ -1134,6 +1177,7 @@ describe("lane ensure, start mode, lane_id and releasing a finished run", () =>
     const lane = await adoptedLane("release-moved-on");
 
     // Create a run for this lane.
+    const restorePath = stubClaudeBinary("release-moved-on");
     const started = await request("POST", `/api/lanes/${lane.id}/start`, { prompt: "test" });
     assert.equal(started.status, 200, JSON.stringify(started.body));
     const runId = started.body.lane.run_id;
@@ -1161,6 +1205,14 @@ describe("lane ensure, start mode, lane_id and releasing a finished run", () =>
       assert.equal(after.status, "running");
     } finally {
       tmux.__reset();
+      // The app never calls kill-session here (healing preserves the "live"
+      // run) — kill the real tmux session directly so it doesn't leak.
+      try {
+        execFileSync("tmux", ["kill-session", "-t", runId], { stdio: "ignore" });
+      } catch {
+        // already gone
+      }
+      restorePath();
     }
   });
 
@@ -1169,6 +1221,7 @@ describe("lane ensure, start mode, lane_id and releasing a finished run", () =>
     const lane = await adoptedLane("release-stale-run");
 
     // Start a run for this lane.
+    const restorePath = stubClaudeBinary("release-stale-run");
     const started = await request("POST", `/api/lanes/${lane.id}/start`, { prompt: "test" });
     assert.equal(started.status, 200, JSON.stringify(started.body));
     const runId = started.body.lane.run_id;
@@ -1195,6 +1248,14 @@ describe("lane ensure, start mode, lane_id and releasing a finished run", () =>
       assert.equal(after.status, "idle", "status should be idle after run is gone");
     } finally {
       tmux.__reset();
+      // The app believes the session is already gone and never calls
+      // kill-session — kill the real tmux session directly so it doesn't leak.
+      try {
+        execFileSync("tmux", ["kill-session", "-t", runId], { stdio: "ignore" });
+      } catch {
+        // already gone
+      }
+      restorePath();
     }
   });
 });