ops(scripts): dispatch, queue gating, heartbeat, quota probe

dispatch-turn.sh (headless turn launcher with TURN_MODEL routing),
queue-after.sh (serial gate chain + quota-wall guard), pmo-heartbeat.sh
(PMO wake loop), quota-probe-then-chain.sh (post-wall relaunch).

scripts/queue-next.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# queue-next.sh — bash-only slot watcher: run queued TASK turns as slots free.
+# rc=3 from dispatch = DEFERRED (cap) -> keep waiting on same task, don't exit.
+set -uo pipefail
+LOGDIR="$HOME/.coordinate/logs"
+i=1
+while [ $i -le $# ]; do
+  task=${!i}
+  i=$((i+1))
+  slug=$(basename "$task" .md | sed 's/^TASK-[0-9]*-[0-9]*-//')
+  while true; do
+    n=$(ls /home/_crossfeed/metrics/active/*.pid 2>/dev/null | wc -l)
+    [ "$n" -lt 2 ] && break
+    sleep 60
+  done
+  echo "$(date -Is) RUN  $slug" >> "$LOGDIR/queue.status"
+  bash "$HOME/.coordinate/scripts/dispatch-turn.sh" "q-$slug" "$task" \
+    >> "$LOGDIR/queue-$slug.log" 2>&1
+  rc=$?
+  if [ "$rc" = 3 ]; then
+    echo "$(date -Is) DEFER $slug (cap) - re-queueing" >> "$LOGDIR/queue.status"
+    i=$((i-1)); sleep 30; continue
+  fi
+  echo "$(date -Is) $([ $rc -eq 0 ] && echo OK || echo FAIL) $slug rc=$rc" >> "$LOGDIR/queue.status"
+  [ $rc -ne 0 ] && exit $rc
+done
+echo "$(date -Is) queue complete" >> "$LOGDIR/queue.status"