fix(pregate): literals checks only the text after a history row's closing bracket; restore digest fixtures

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

docs/pregate.md

@@ -175,7 +175,8 @@ Two stages with separate clocks, both printed:
   the branch added (the file at the merge base, read through a rename git
   detects, has no new-value row). A table the branch did not extend, a file that already held a
   new-value row at the merge base, a merge base that cannot be read, and every
-  other line holding the old value still fail. Rows in object form (`{ v: 45 }`) or spread over several
+  other line holding the old value still fail. Only the row itself is exempt:
+  the old value after its closing bracket on the same line still fails. Rows in object form (`{ v: 45 }`) or spread over several
   lines are not recognized as history rows.
 
 - `timing`: added or changed test lines that compare an elapsed wall-clock or