fix(media): a tvdb episode page is not the episode list

Tvdb's default episode query answers at most 500 rows and states no total.
One Piece (1999), Crayon Shin-chan (1992) and Detective Conan (1996) each
answer exactly 500 while holding over a thousand, so the contradiction rule
added in the previous commit read every long-running show as contradicted:
the pack books more episodes than "the authority holds", and the rule that
exists to stop a wrong anime title would have stripped the right one from
every file of the season.

A capped list now records that it is capped (`tvdb:capped:<id>`, so a warm
cache answers the same question a cold one did) and contradicts nothing;
titles for the episodes the page does hold still ride.

Test: a 500-row page with a 501-episode pack keeps ` - Episode 1` and lists
no contradiction. Red before the change, proved in a copy of the tree with
the cap raised past the fixture.

tests/media_shows.bats

@@ -539,3 +539,30 @@ PY
     [ "$(dst "$LIB/Gate Pack/Season 05/two S05E01.mkv")" = "$want" ]
     grep -A6 -i "numbering tvdb contradicts" "$EXC" | grep -q "Anime Gate"
 }
+
+# Tvdb's default episode query answers at most 500 rows and states no total, so a
+# list that long is a PAGE, not a list: One Piece (1999), Crayon Shin-chan (1992)
+# and Detective Conan (1996) each answer exactly 500 while holding over a thousand.
+# Read as the whole truth, that page contradicts every long-running show's pack
+# and strips the tvdb title from all of it.
+@test "an episode list the authority paginates never contradicts the pack" {
+    python3 - "$CACHE" <<'PY'
+import json, sys
+json.dump({"tvdb:series:4242": {"name": "Long Run", "year": "1999"},
+           "tvdb:episodes:4242": {f"1/{n}": f"Episode {n}"
+                                  for n in range(1, 501)}},
+          open(sys.argv[1], "w"))
+PY
+    for n in $(seq 1 501); do
+        ep=$(printf '%02d' "$n")
+        file "$LIB/Long Pack/Season 01/long $ep.mkv" 1000
+        title_row "$LIB/Long Pack/Season 01/long $ep.mkv" \
+            "Long Run" 1999 1 "$n" "" "" "" "4242"
+    done
+    plan
+    want="$LIB/Long Run (1999) [tvdbid-4242]/Season 01"
+    want+="/Long Run (1999) - S01E01 - Episode 1.mkv"
+    [ "$(dst "$LIB/Long Pack/Season 01/long 01.mkv")" = "$want" ]
+    run grep -i "numbering tvdb contradicts" "$EXC"
+    [ "$status" -ne 0 ]
+}