The inspector parses the B3 envelope's image_tags facet (strictly: exact
keys, current/none/unavailable, at most 100 vocabulary names) and draws one
chip row after the prompt blocks: the file's current image tags first, then
D21's linked tags not already shown (case-insensitive). In the Images panel
image tags are Tags filter buttons and linked tags keep D21's rule; in the
viewer and wherever no Tags filter exists every chip is plain. none and
unavailable add no chips (D88, plan D65; D21 amended).
The tagging fixture reset now drops leftover captures, so a long run of
tagging tests in one worker stays below the capture store's limit.