docs(media): point plan/journal/park paths at .media-campaign and NeedsProcessing

The campaign-artifact home moved (42bc482) but the copy-paste surfaces still
named the old ones, and a tool's usage block is exactly what an agent runs:

- scripts/media-shows.py, media-tv.py, media-tvdupes.py: usage examples wrote
  plans and journals at the array root. media-apply.py defaults its journal to
  <root>/media-relayout.jsonl, so any run copied from those lines re-creates
  the root-level clutter the vault now forbids. Each block now names
  /mnt/entropy/.media-campaign/ and says why --journal is explicit.
- media-shows.py: --park named the retired media-park; the pile is
  /mnt/entropy/NeedsProcessing/TVShows.
- Jellyfin.md: library-coverage law named /data/media-park; names the pile by
  its current path and records when it moved.
- Media TV Relayout.md: the runnable --park path named media-park.

bats: 822 seams green.

scripts/media-tv.py

@@ -17,13 +17,20 @@ the executor's own path guard still has teeth, and give it its own journal —
 one journal is one undo, and a TV move must not be welded to a movie relayout:
 
     python3 scripts/media-tv.py --root /mnt/entropy/Movies \
-        --library /mnt/entropy/TVShows --out /mnt/entropy/media-tv-plan.tsv
-    python3 scripts/media-apply.py apply --plan /mnt/entropy/media-tv-plan.tsv \
-        --root /mnt/entropy --journal /mnt/entropy/media-relayout-tv.jsonl
-    python3 scripts/media-apply.py verify --plan /mnt/entropy/media-tv-plan.tsv \
-        --root /mnt/entropy --journal /mnt/entropy/media-relayout-tv.jsonl
+        --library /mnt/entropy/TVShows \
+        --out /mnt/entropy/.media-campaign/media-tv-plan.tsv
+    python3 scripts/media-apply.py apply \
+        --plan /mnt/entropy/.media-campaign/media-tv-plan.tsv \
+        --root /mnt/entropy --journal /mnt/entropy/.media-campaign/media-relayout-tv.jsonl
+    python3 scripts/media-apply.py verify \
+        --plan /mnt/entropy/.media-campaign/media-tv-plan.tsv \
+        --root /mnt/entropy --journal /mnt/entropy/.media-campaign/media-relayout-tv.jsonl
     python3 scripts/media-apply.py sweep --root /mnt/entropy \
-        --journal /mnt/entropy/media-relayout-tv.jsonl --apply
+        --journal /mnt/entropy/.media-campaign/media-relayout-tv.jsonl --apply
+
+Plans and journals live in `/mnt/entropy/.media-campaign/`, never loose on the
+array root: `media-apply.py` defaults its journal to `<root>/media-relayout.jsonl`,
+so `--journal` is always explicit here.
 
 Guards, and why each one is here: