Fix red develop ef75f3d15bb0

The merge lane found `develop` red at `ef75f3d15bb04fa795d1dde56903aafcc2a0d6e4` on its own: no queued PR merges until it is fixed. Failing (tests and gate stages): - `tests/test_nodelink_share.py::test_one_call_creates_sets_storage_attaches_every_node_that_mounts_requests_provisioning_and_audits` - `api-unit-dc-test` The whole gate log: artifact `7992` on lane task 8788. Make `develop` pass its full gate again. Open a PR as usual: the merge lane merges a PR that fixes some of these and adds no failure even while `develop` is red.

Fixed red develop: PR #6547 lets macOS mount NodeLinks, but the share test still expected the Mac to be skipped. Updated the test, product code unchanged. Share and nodelinks suites pass (146) and quick gate is green. PR #6549 is queued to the merge lane. Memory: none applied.