An inline, wrapping metadata line - a flex row of projected CngxMeta
pairs separated by a consistent gap. It carries the shared muted colour + gap
so a detail zone reads trace 9f31c0d4 tenant north pod auth-7d9f4 without
the consumer hand-rolling display:flex + <b> markup for every row.
Presentational by design (see CngxMeta): it is not a semantic list.
Tune the spacing / colour through the --cngx-meta-list-* custom properties.