system.md carries {{ label }}-style variables and an {% if not archetype %} block in place of the config:repo / config:archetype marker pairs, so prompt.rs drops its line filter, marker parsers and string replaces. The rendered prompt is byte for byte the old one for a custom agent, an archetype agent and an empty archetype name, with and without hive, swarm, docs and operators. hive-template now drops a block tag's own line.
A todo node's key and text were hand-expanded `{field}` strings. They are now Jinja templates rendered through the new hive-template crate (minijinja, an unknown variable is an error), and the controller's save check reads the variables the template uses. The flows document is version 2; a version 1 document reads as version 2 with each `{field}` converted to `{{ field }}`, and the next save writes it.
