Negative fixture: one file, two lists; only the list's own join counts (Task 7 fix round 1)

MV-N1's list is joined with " and ". MV-N2's unrelated list in the same file is joined with ", ", which must not answer for MV-N1.

| id | file | text | status | |---|---|---|---| | MV-N1 | head.go | the environment differs from the source's: <NAME (kind)>, ... | approved | | MV-N2 | head.go | the boxes that answered: <box>, ... | approved |