reviews: record tonight's five — 5391, 5390, 4847, 5324, 5287 5391 and 5390 are ours and merged; 4847 is AKnassa's, merged after its second round. 5324 is drafted approve, not posted. 5287 had no new review to post — the head never moved. Each page carries the lesson rather than just the verdict: 5391's self-gate requested changes on our own draft and changed the shipped fix; 5390 is the third instance of a wiki-authored key breaking build-sandbox, which makes the earlier guard a patch (R3d); 4847 is the clean R1e example; 5287's finding is that 16 core components take isLoading and exactly one makes the control inert.