add drain-mode orchestration and docs/tasks sync for codex-opencode

bin/mosaic-orchestrator-drain

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
+sync_cmd="$MOSAIC_HOME/bin/mosaic-orchestrator-sync-tasks"
+run_cmd="$MOSAIC_HOME/bin/mosaic-orchestrator-run"
+
+do_sync=1
+poll_sec=15
+extra_args=()
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --no-sync)
+      do_sync=0
+      shift
+      ;;
+    --poll-sec)
+      poll_sec="${2:-15}"
+      shift 2
+      ;;
+    *)
+      extra_args+=("$1")
+      shift
+      ;;
+  esac
+done
+
+if [[ $do_sync -eq 1 ]]; then
+  "$sync_cmd" --apply
+fi
+
+exec "$run_cmd" --until-drained --poll-sec "$poll_sec" "${extra_args[@]}"