Records the two decisions the paper feature rests on: a sentence is addressed
by the template placement's `sort` rather than by a row id, and citations are
a table rather than a column. Both explain behaviour that otherwise looks
arbitrary — why an empty paper already has its structure, why a template switch
destroys nothing, and why content with no matching heading is still rendered.
Also documents the new endpoints, the /papers/:id route, the paper view's three
jobs, and the smoke test.
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