- Item.ordinal: the 1-based position in booth_items over the items that
render. It is appended, and set in the resolver. Tiles print it padded to
the whole set's width, and a filter never renumbers.
- review_chain: the item order filtered to media. It replaces image_chain as
the zoom route's ring, so a set of pictures and sound steps through both.
image_chain stays importable.
- .seen: which media items were looked at full size, written by the review
route under record_view's gate. It is rewritten whole: deduplicated, pruned
to live items, sorted. The temp file is created with O_EXCL and swapped in
with os.replace, so a planted symlink is replaced, never written through.
It never raises.
Nine new tests. The contiguity and symlink tests are mutation-checked.
669 passed.
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