run_job.sh: new wrapper called by scheduler cron for every job.
Writes /var/log/varaverk/<id>.json (status/start/end/exit/pid)
and /var/log/varaverk/<id>.log (latest run output, overwritten).
Maps exit 0→ok, 1→warn, 2+→error so watchdog "took action" runs
show warn not error.
scheduler: cron now calls bash run_job.sh instead of inline bash -c.
Added vv_job_stat_path(). LOG_DIR moved to config.php (shared).
monitor: vv_scripts_status() now reads /var/log/varaverk/*.json and
*/*.json — no User Scripts tmpScripts dependency at all.
Stale running detection via /proc/<pid> check.
Returns error_count in addition to running/ok/warn counts.
pages/monitor.php: added error pill (red ✗), error icon/color in
list, duration shown next to age for each script entry.