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-after.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# queue-after.sh <gate-screen> <slug> <task-file>
+# Wait until <gate-screen> no longer exists, then dispatch the task turn.
+# Keeps repo-touching turns serialized when two queue screens would overlap.
+set -uo pipefail
+GATE="$1"; SLUG="$2"; TASK="$3"
+LOGDIR="$HOME/.coordinate/logs"
+while screen -ls 2>/dev/null | grep -q "\.${GATE}[[:space:]]"; do
+  sleep 60
+done
+# QUOTA WALL GUARD: if any recent turn log shows the z.ai usage wall,
+# halt the chain instead of burning the next turn into the same wall.
+WALLLOG=$(ls -t "$LOGDIR"/q-*.log 2>/dev/null | head -1)
+if [ -n "$WALLLOG" ] && grep -q "Usage limit reached" "$WALLLOG" 2>/dev/null; then
+  echo "$(date -Is) QUOTA WALL detected in $WALLLOG — chain halted before $SLUG" >> "$LOGDIR/queue.status"
+  screen -S RCEO-PMO -X stuff "QUOTA WALL - chain halted before $SLUG. Do not dispatch until quota verified.$(printf '\r')" || true
+  exit 0
+fi
+echo "$(date -Is) GATE $GATE cleared — RUN $SLUG" >> "$LOGDIR/queue.status"
+bash "$HOME/.coordinate/scripts/dispatch-turn.sh" "q-$SLUG" "$TASK" \
+  >> "$LOGDIR/queue-$SLUG.log" 2>&1
+rc=$?
+echo "$(date -Is) $([ $rc -eq 0 ] && echo OK || echo "FAIL(rc=$rc)") $SLUG" >> "$LOGDIR/queue.status"