Parametrize sibling tests that differed only in a literal value, and fold
two strict-subset tests into the survivors that already covered their
scenario. Every case that ran before still runs; the union of assertions
is applied to each case, strengthening list_all, get_pages_data and
resolve_doc_items.
Replace four hand-rolled log-capture handlers with a shared
capture_logs() contextmanager in conftest.
13 fewer test functions, 348 fewer lines.
