feat(media): the relayout executor names the reap its moves leave behind

A relayout renames on the raw array; the sidecars the media servers wrote live in
the NVMe upper layer of the view and stay at the old coordinates, which is how a
ghost folder (artwork and an .nfo, no video) is born. apply and rollback now
print the follow-up — scripts/media-view.sh reap — at the moment the operator
needs it, and the existing apply seam asserts the hint is in the output.

tests/media_relayout.bats

@@ -402,6 +402,9 @@ apply_plan() {
     moved=$(python3 -c 'import json,sys
 print(sum(1 for l in open(sys.argv[1]) if json.loads(l).get("op") == "move"))' "$JOURNAL")
     [ "$moved" -eq "$planned" ]
+    # The media servers' sidecars live in the metadata overlay and did not follow
+    # these moves, so the run names that cleanup at the moment it is needed.
+    [[ "$output" == *"media-view.sh reap"* ]]
     run python3 "$APPLY" verify --plan "$OUT" --root "$LIB" --journal "$JOURNAL"
     [ "$status" -eq 0 ]
 }