subwave: default playlistExhaust=true for created shows, fixes repeats

A playlistStrict show's no-repeat window scales down to a fraction of the
playlist size and disables entirely below 15 tracks (recency.ts's
effectiveNoRepeatWindow) -- every historical-chart playlist this script
builds is well under that (7-30 tracks), so repeats were essentially
unthrottled. playlistExhaust switches to a full-rotation window instead.
Also applied this fix retroactively to all 8 existing shows.

Claude-Session: https://claude.ai/code/session_01L7Rwa6guD5wK8F8tWQwcJX

subwave/recreate_broadcast.py

@@ -342,6 +342,13 @@ def run(args):
         "guestPersonaIds": [],
         "playlistIds": [playlist_id],
         "playlistStrict": True,
+        # A playlist-pinned show's no-repeat window otherwise scales down to a
+        # fraction of the playlist size and disables entirely below 15 tracks
+        # (recency.ts's effectiveNoRepeatWindow) -- every playlist this script
+        # builds is well under that, so without this flag repeats are
+        # essentially unthrottled. playlistExhaust switches to a full-rotation
+        # window instead (nearly the whole playlist must play before a repeat).
+        "playlistExhaust": True,
         "filtersStrict": True,
         "moods": [], "genres": [], "energies": [], "eras": [],
         "excludedPlaylistIds": [],