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.

scripts/media-apply.py

@@ -114,6 +114,13 @@ def read_plan(path, root, force):
     return mkdirs, keeps, moves
 
 
+# A relayout moves bytes on the raw array; the sidecars the media servers wrote
+# live in the SSD overlay and stay at the old coordinates. Naming the follow-up
+# here is the point of use for that fact — see the Media Metadata View page.
+METADATA_HINT = ("note: sidecars written through the metadata view did not follow"
+                 " these moves — next: scripts/media-view.sh reap")
+
+
 def do_apply(args, root, journal, mkdirs, keeps, moves):
     """Preflight everything, then folders, then renames. Never a partial start."""
     problems = []
@@ -195,6 +202,7 @@ def do_apply(args, root, journal, mkdirs, keeps, moves):
           f" {dirs_new} folders created, {len(keeps)} files stayed put")
     print(f"journal: {journal.path} — undo with: media-apply.py rollback"
           f" --journal {journal.path} --root {root} --apply")
+    print(METADATA_HINT)
     return 0
 
 
@@ -378,6 +386,7 @@ def do_rollback(args, root, journal):
                    t=datetime.datetime.now(datetime.timezone.utc).isoformat())
     print(f"rolled back: {undone} files back where the census found them,"
           f" {dirs_gone} empty folders removed, {recreated} swept folders recreated")
+    print(METADATA_HINT)
     return 0