The schema + cell/row/table/doc builders + grid/stateFor/trFor were copied
verbatim into the 3 new table-utils test files (and the pre-existing
table-utils.test.ts) — a schema change would have to be synced across all four.
Move them into a shared table-test-helpers.ts (test-only, excluded from the
build like footnote-corpus.ts) and import it everywhere; cell uses the
(txt, attrs?) superset (a drop-in for the bare (txt) copies). No assertion
changes — test counts unchanged (223 passed + 3 expected-fail).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>