Say when a scheduled task is running

A run is detached — cron has no terminal, and the app fires it as a detached
exec — so triggering one and watching the log was indistinguishable from
triggering one that died. Worse, `claude -p` writes its answer in a single
burst at the end, so a healthy run shows nothing but its log header for as
long as it is thinking. The honest reading of the old UI was "it stalled".

triple-c-task-runner now publishes a state file per run (pid, start time, log
path) and removes it from an EXIT trap. flock remains what actually prevents
overlapping runs; this is purely observability, so every reader verifies the
pid rather than trusting the file — a container stopped mid-run cannot fire a
trap, and a task stuck on "running" forever would be a worse lie than no
indicator at all. Stale files are cleared on read.

On top of that:

- `list` grows a status column: "running 4m12s" or "idle".
- `status [--id] [--watch]` answers "is it still going?" directly, with
  elapsed time and the tail of the log when there is any output yet.
- `run` streams the log instead of blocking silently, and refuses to start a
  task that is already running.
- The Automation tab marks a running task, disables its Run now button, and
  polls while anything is in flight — including the second or two between
  firing a run and the runner registering it, which is the exact window that
  used to read as dead.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

app/src/components/projects/home/AutomationTab.tsx

@@ -15,7 +15,7 @@ import Toggle from "../../ui/Toggle";
 import Modal from "../../ui/Modal";
 import StatusIndicator from "../../ui/StatusIndicator";
 import TaskEditorModal from "./TaskEditorModal";
-import { formatAge } from "./format";
+import { formatAge, formatRunningFor } from "./format";
 
 interface Props {
   project: Project;
@@ -59,6 +59,22 @@ export default function AutomationTab({ project }: Props) {
 
   useEffect(load, [load]);
 
+  // A task in flight is the one state this view cannot sit still for: runs are
+  // detached, so without polling "Run now" looks like it did nothing until the
+  // user reaches for Refresh. Polling stops as soon as nothing is running.
+  //
+  // `justTriggered` covers the gap between firing a run and the runner writing
+  // its state file — a second or two in which the task still reads as idle, and
+  // where giving up on polling would reproduce the exact silence this fixes.
+  const anyTaskRunning = tasks.some((t) => t.running);
+  const [justTriggered, setJustTriggered] = useState(0);
+  useEffect(() => {
+    if (!running) return;
+    if (!anyTaskRunning && Date.now() - justTriggered > 20_000) return;
+    const timer = setInterval(load, anyTaskRunning ? 5000 : 1500);
+    return () => clearInterval(timer);
+  }, [running, anyTaskRunning, justTriggered, load]);
+
   const withTask = async (taskId: string, label: string, fn: () => Promise<unknown>) => {
     setBusyTaskId(taskId);
     try {
@@ -185,6 +201,12 @@ export default function AutomationTab({ project }: Props) {
                     <span className="text-[10px] uppercase tracking-wide px-1.5 py-0.5 rounded-[var(--radius-control)] bg-[var(--bg-tertiary)] text-[var(--text-secondary)]">
                       {task.task_type}
                     </span>
+                    {task.running && (
+                      <StatusIndicator
+                        tone="busy"
+                        label={`Running ${formatRunningFor(task.running_since) ?? ""}`.trim()}
+                      />
+                    )}
                   </div>
                   <div className="text-xs text-[var(--text-secondary)] font-mono truncate">
                     {task.at ?? task.schedule}
@@ -202,14 +224,15 @@ export default function AutomationTab({ project }: Props) {
                   }
                 />
                 <Button
-                  disabled={busyTaskId === task.id}
+                  disabled={busyTaskId === task.id || task.running}
                   onClick={() =>
-                    withTask(task.id, "Run now", () =>
-                      runScheduledTaskNow(project.id, task.id),
-                    )
+                    withTask(task.id, "Run now", async () => {
+                      await runScheduledTaskNow(project.id, task.id);
+                      setJustTriggered(Date.now());
+                    })
                   }
                 >
-                  Run now
+                  {task.running ? "Running…" : "Run now"}
                 </Button>
                 <Button disabled={busyTaskId === task.id} onClick={() => setEditing(task)}>
                   Edit