add matrix orchestrator rail and repo scaffolding

templates/repo/.mosaic/orchestrator/tasks.json

@@ -0,0 +1,16 @@
+{
+  "tasks": [
+    {
+      "id": "EXAMPLE-001",
+      "title": "Example orchestrator task",
+      "description": "Replace this with a real task and command",
+      "status": "pending",
+      "runtime": "codex",
+      "command": "",
+      "quality_gates": [],
+      "metadata": {
+        "source": "bootstrap-template"
+      }
+    }
+  ]
+}