artifact-store-tools: date the sweep test's builder log on the real clock

The test copies aMesh's log, dated from 2026-10-01 for a fixed clock, but runs the holder on time.Now; since
2026-10-31 every entry fell outside the log's 30 days, so the sweep rightly kept every copy as unrecorded and the
mirror act was missing. The sweep is right; the fixture is shifted to now (issue 1955, L7a).

Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL

modules/artifact-store-tools/cmd/artifact-store-tools/holder_integration_test.go

@@ -138,7 +138,13 @@ func TestTheSeatSweepsAtABuildsEndOnARealBusOnceTheLeaseIsAway(t *testing.T) {
 
 	// The mesh as aMesh lays it, copied onto the real buckets: letta's seven builds, a want, the store's listing.
 	mem, memb, door, _ := aMesh(t, &buscompose.LeaseHolder{Instance: "c1", Host: "novox", Epoch: 3})
-	bus.log = memb.log
+	// The builder's log as written today: aMesh dates it from 2026-10-01 for its fixed clock, and this holder runs on the
+	// real clock, so read as dated the entries fall out of the log's 30 days and every copy is kept as unrecorded.
+	shift := time.Since(memb.log[len(memb.log)-1].At)
+	for _, e := range memb.log {
+		e.At = e.At.Add(shift)
+		bus.log = append(bus.log, e)
+	}
 	for _, s := range []string{BuildsRead, WantsRead, LeaseRead, ManifestsRead} {
 		keys, _ := memb.Keys(s)
 		for _, k := range keys[:min(len(keys), 6)] { // the seventh build ends later, on the bus