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/work-chain.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+# work-chain.sh <chain-name> <task-file>... — sequential overnight work driver.
+# Runs dispatch-turn.sh per TASK in order. Skips tasks already REPORTed.
+# Stops on first failure; status -> ~/.coordinate/logs/<chain-name>.status
+set -uo pipefail
+CHAIN=${1:?chain name}; shift
+LOGDIR="$HOME/.coordinate/logs"
+STATUS="$LOGDIR/$CHAIN.status"
+inbox="$HOME/.coordinate/inbox-pmo"
+
+echo "$(date -Is) chain start: $*" > "$STATUS"
+for task in "$@"; do
+  slug=$(basename "$task" .md | sed 's/^TASK-[0-9]*-[0-9]*-//')
+  if ls "$inbox"/REPORT-*"$slug"* >/dev/null 2>&1; then
+    echo "$(date -Is) SKIP $slug (reported)" >> "$STATUS"; continue
+  fi
+  if [ ! -f "$task" ]; then
+    echo "$(date -Is) FAIL $slug (task file missing) — chain halted" >> "$STATUS"
+    screen -S RCEO-PMO -X stuff "CHAIN $CHAIN HALTED missing task $slug.\r"
+    exit 2
+  fi
+  echo "$(date -Is) RUN  $slug" >> "$STATUS"
+  bash "$HOME/.coordinate/scripts/dispatch-turn.sh" "$CHAIN-$slug" "$task" \
+    >> "$LOGDIR/$CHAIN-$slug.log" 2>&1
+  rc=$?
+  if [ $rc -ne 0 ]; then
+    echo "$(date -Is) FAIL $slug rc=$rc — chain halted" >> "$STATUS"
+    screen -S RCEO-PMO -X stuff "CHAIN $CHAIN HALTED at $slug - read $STATUS.\r"
+    exit $rc
+  fi
+  echo "$(date -Is) OK   $slug" >> "$STATUS"
+done
+echo "$(date -Is) chain COMPLETE" >> "$STATUS"
+screen -S RCEO-PMO -X stuff "CHAIN $CHAIN COMPLETE - read status + inbox-pmo.\r"