+A permanent child agent lives in ``agent/children/NAME/`` with the same
+files as the root. Create its directory and ``config.json`` by hand
+before startup. Use the root config fields with a separate random ID,
+set ``name`` to ``NAME``, and add ``parent`` with the root name and
+``responsibility`` with the child's area. The daemon opens all children
+at startup. A missing or invalid child config stops startup. Only one
+level of children is supported.
+
+Each child has its own memory, model client, usage file, subagents,
+schedules, and turn loop. Its prompt limits work to its area, asks for
+only reports that need the parent or the user, and permits an empty
+reply. Children have no WhatsApp tools and draft replies instead of
+sending them. Clients and WhatsApp still address only the root. There
+are no messages or tools between parent and child agents. A child's
+saved schedules and subagents can resume at startup. The ready log line
+lists the child names.
+