A single metadata pair - a short bold term followed by its projected value -
for the supplementary key/value lines that sit inside detail zones, cards, and
popovers (e.g. trace 9f31c0d4). Compose several inside a CngxMetaList.
This is the lightweight, presentational option: the term is a plain string
input and the pair reads linearly to a screen reader (term value). When you
need real term/description semantics for a longer or more structured block,
reach for a definition list instead - CngxMeta deliberately stays flat.