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-tauri/src/docker/container.rs

@@ -18,11 +18,12 @@ This container supports scheduled tasks via `triple-c-scheduler`. You can set up
 ### Commands
 - `triple-c-scheduler add --name "NAME" --schedule "CRON" --prompt "TASK"` — Add a recurring task
 - `triple-c-scheduler add --name "NAME" --at "YYYY-MM-DD HH:MM" --prompt "TASK"` — Add a one-time task
-- `triple-c-scheduler list` — List all scheduled tasks
+- `triple-c-scheduler list` — List all scheduled tasks, with a running/idle status column
 - `triple-c-scheduler remove --id ID` — Remove a task
 - `triple-c-scheduler enable --id ID` / `triple-c-scheduler disable --id ID` — Toggle tasks
+- `triple-c-scheduler status [--id ID] [--watch]` — Show what is running right now, and for how long
 - `triple-c-scheduler logs [--id ID] [--tail N]` — View execution logs
-- `triple-c-scheduler run --id ID` — Manually trigger a task immediately
+- `triple-c-scheduler run --id ID` — Manually trigger a task immediately (streams its log)
 - `triple-c-scheduler notifications [--clear]` — View or clear completion notifications
 
 ### Cron format
@@ -36,7 +37,7 @@ Use `--at "YYYY-MM-DD HH:MM"` instead of `--schedule`. The task automatically re
 Use `--working-dir /workspace/project` to set where the task runs (default: /workspace).
 
 ### Checking results
-After tasks run, check notifications with `triple-c-scheduler notifications` and detailed output with `triple-c-scheduler logs`.
+While a task is running, `triple-c-scheduler status` reports it with elapsed time — a log that has stopped growing is normal, because `claude -p` writes its answer only at the end, so use `status` rather than log silence to tell a slow run from a dead one. After tasks run, check notifications with `triple-c-scheduler notifications` and detailed output with `triple-c-scheduler logs`.
 
 ### Timezone
 Scheduled times use the container's configured timezone (check with `date`). If no timezone is configured, UTC is used."#;