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/format.ts

@@ -26,6 +26,21 @@ export function formatElapsed(ms: number): string {
   return `${days}d ago`;
 }
 
+/** "for 42s" / "for 4m" / "for 1h 12m" — elapsed phrasing for a run in flight.
+ *  Seconds are kept below a minute because the first thing anyone wants from a
+ *  freshly triggered run is evidence that it started at all. */
+export function formatRunningFor(iso: string | null | undefined): string | null {
+  if (!iso) return null;
+  const started = Date.parse(iso);
+  if (Number.isNaN(started)) return null;
+  const seconds = Math.max(0, Math.floor((Date.now() - started) / 1000));
+  if (seconds < 60) return `for ${seconds}s`;
+  const minutes = Math.floor(seconds / 60);
+  if (minutes < 60) return `for ${minutes}m`;
+  const hours = Math.floor(minutes / 60);
+  return `for ${hours}h ${minutes % 60}m`;
+}
+
 /** Uptime phrasing for a known start timestamp. */
 export function formatUptime(startedAtMs: number | undefined): string | null {
   if (startedAtMs === undefined) return null;