The common envelope
A node requires id, name, description, type, and kind. Optional properties,
movement, boundaries, invariants, and relationships add useful context. Do not fill
optional fields with invented precision.
Identity outlives location
Root node: front matter is this site’s storage convention. Its ID does not depend
on its filename, folder, or URL. A concept page and an expression page can therefore
participate in the same graph without sharing a directory.
The node is a model, not evidence that the modeled thing exists or behaves as claimed. Validate its structure and review its meaning separately.