Triage: mark confirmed-dead channels Invalid, clarify geo-blocked Japan feeds

Went through the open issue backlog and verified each claim against
the live streams with check_channels.py / curl before touching
anything, rather than acting on the reports alone.

Moved to Invalid (2 attempts, both `gone`, re-verified by hand):
- Greece: Start, Thraki Net TV
- Slovakia: Doma, Dajto, Krimi, Markíza TN Live, Jojko (joining the
  JOJ-family channels already Invalid - same upstream host, same
  missing-channel pattern)
- Bosnia and Herzegovina: Sevdah
- Spain: Nova, La 7 CYLTV, Canal TE24
- USA: NASA TV Public
- USA + zz_news_en: CNN / CNN International - both point at
  turnerlive.warnermediacdn.com/.../cnn_slate/..., which returns a
  permanently frozen manifest (#EXT-X-PUBLISHED-TIME and
  MEDIA-SEQUENCE identical across two fetches 8s apart, dated several
  months in the past) - a live-looking HTTP 200 that check_channels.py
  currently has no way to catch, since it never compares a URL against
  its own earlier response. Also moved the alternate CNN entry in
  zz_news_en.md (a raw.githubusercontent.com link that 404s outright).
- Not moved: N1 Bosna i Hercegovina (`disputed` - ffprobe found a real
  stream behind the dead-looking HTTP response, needs a human) and
  everything reported merely `unreachable`/`blocked` across these
  lists - neither is strong enough evidence on its own, see
  check_channels.py's own docstring.

Japan: added the Ⓖ marker to the 6 terrestrial channels on mov3.co
(NHK総合, 日本テレビ, テレビ朝日, TBSテレビ, テレビ東京, フジテレビ) -
confirmed HTTP 403 from here on all six, consistent with the
geo-restriction every other Ⓖ-marked channel in this repo already
documents. They were working `[>]` entries with no Ⓖ, which reads as
"this should work from anywhere" when it does not.

Left alone after checking (false alarms / already resolved, not a
list-file problem):
- Croatia HRT 1-4: already Ⓖ-marked and alive.
- Mongolia TenGer TV/TV5/TV9: all 40 Mongolia channels alive.
- Japan Willfonk/naori-test links: already Invalid on master.
- Several `unreachable` entries (Greece ART TV/Epirus TV 1, Croatia's
  RTL family, half of Spain, Bosnia's BHT/Glas Drine/etc.) -
  `unreachable` means "every attempt timed out or failed to connect
  from here", not "confirmed gone" - too weak to act on without a
  second opinion, and these didn't get one in this pass.

ran: python3 make_playlist.py (clean regen) + check_channels.py on
every touched list afterward to confirm nothing newly broke and the
moved channels no longer show up as working.

playlists/playlist_zz_news_en.m3u8

@@ -67,10 +67,6 @@ https://i.mjh.nz/sky-news-now.m3u8
 https://live.corusdigitaldev.com/groupd/live/49a91e7f-1023-430f-8d66-561055f3d0f7/live.isml/.m3u8
 #EXTINF:-1 tvg-name="Russia Today" tvg-logo="https://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/Russia-today-logo.svg/500px-Russia-today-logo.svg.png" tvg-id="RT.ru" tvg-chno="34" group-title="News",Russia Today Ⓖ
 https://rt-glb.rttv.com/live/rtnews/playlist.m3u8
-#EXTINF:-1 tvg-name="CNN" tvg-logo="https://raw.githubusercontent.com/tv-logo/tv-logos/main/countries/united-states/cnn-us.png" tvg-id="CNN.us" tvg-chno="36" group-title="News",CNN
-https://raw.githubusercontent.com/Alstruit/adaptive-streams/alstruit-10_23_us/streams/us/CNNUSA.us.m3u8
-#EXTINF:-1 tvg-name="CNN International" tvg-logo="https://raw.githubusercontent.com/tv-logo/tv-logos/main/countries/united-states/cnn-us.png" tvg-id="CNNInternationalEurope.us" tvg-chno="37" group-title="News",CNN International
-https://turnerlive.warnermediacdn.com/hls/live/586495/cnngo/cnn_slate/VIDEO_0_3564000.m3u8
 #EXTINF:-1 tvg-name="GB News" tvg-logo="https://upload.wikimedia.org/wikipedia/en/thumb/3/35/GB_News_Logo.svg/500px-GB_News_Logo.svg.png" tvg-id="GBNews.uk" tvg-chno="38" group-title="News",GB News Ⓨ
 https://www.youtube.com/channel/UC0vn8ISa4LKMunLbzaXLnOQ/live
 #EXTINF:-1 tvg-name="TalkTV" tvg-logo="https://i.imgur.com/KxHWpQB.png" tvg-id="TalkTV.uk" tvg-chno="39" group-title="News",TalkTV