Sequence

A sequence diagram whose ORDER comes from prose and whose EDGES come from the graph. `source` names a Markdown-ranged property on the page instance; every [[reference]] in that prose, in document order, supplies the participants (the lifelines) and the order of interaction. Between each consecutive pair of referenced resources, every `connectors` entry whose relation actually holds in the graph between them is drawn as a message — its direction taken from the triple, never from the sentence, so passive voice cannot mislead. A [[reference]] to a connector's relation placed between two participant references selects that edge for that pair alone. References that connect to nothing become no lifeline; the graph is the filter. Participants render as their own identity tiles, and both lifeline and message labels resolve through the display lens, so a class-level displayLabel applies. Lifeline heads size by `nodeTier` on the band, else by the participants' class-level `diagramTier`, else icon. The prose is the annotation — render it alongside with a Markdown band over the same property, and the narrative and the diagram cannot drift; `kanonak validate` reports where they do.