add matrix orchestrator rail and repo scaffolding

bin/mosaic-orchestrator-run

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.mosaic}"
+CTRL="$MOSAIC_HOME/rails/orchestrator-matrix/controller/mosaic_orchestrator.py"
+
+if [[ ! -f "$CTRL" ]]; then
+  echo "[mosaic-orchestrator] missing controller: $CTRL" >&2
+  exit 1
+fi
+
+exec python3 "$CTRL" --repo "$(pwd)" "$@"