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_usa.m3u8

@@ -11,8 +11,6 @@ https://2-fss-1.streamhoster.com/pl_154/205722-2251224-1/playlist.m3u8
 https://lukentvlive.vgcdn.net/v1/master/cef183924f24adfa3d5d7601c3a17769082c0c2b/heartland/index.m3u8
 #EXTINF:-1 tvg-name="Rev'n" tvg-logo="https://i.imgur.com/VUhqVgG.png" tvg-id="RevnTV.us" tvg-chno="6" tvg-country="US" group-title="USA",Rev'n
 https://lukentvlive.vgcdn.net/v1/master/cef183924f24adfa3d5d7601c3a17769082c0c2b/Revn/index.m3u8
-#EXTINF:-1 tvg-name="CNN" tvg-logo="https://i.imgur.com/vyrc1I1.png" tvg-id="CNN.us" tvg-chno="1" tvg-country="US" group-title="USA",CNN
-https://turnerlive.warnermediacdn.com/hls/live/586495/cnngo/cnn_slate/VIDEO_0_3564000.m3u8
 #EXTINF:-1 tvg-name="CNBC" tvg-logo="https://i.imgur.com/BTasyOy.png" tvg-id="CNBC.us" tvg-chno="2" tvg-country="US" group-title="USA",CNBC Ⓨ
 https://www.youtube.com/c/CNBC/live
 #EXTINF:-1 tvg-name="Bloomberg" tvg-logo="https://i.imgur.com/VnCcH73.png" tvg-id="BloombergTelevision.us" tvg-chno="3" tvg-country="US" group-title="USA",Bloomberg
@@ -25,8 +23,6 @@ https://cbsnews.akamaized.net/hls/live/2020607/cbsnlineup_8/master.m3u8
 https://d1bl6tskrpq9ze.cloudfront.net/hls/master.m3u8?ads.xumo_channelId=99984003
 #EXTINF:-1 tvg-name="Reuters TV" tvg-logo="https://i.imgur.com/AbvCnoH.png" tvg-id="ReutersTV.us" tvg-chno="7" tvg-country="US" group-title="USA",Reuters TV
 https://reuters-reutersnow-1-eu.rakuten.wurl.tv/playlist.m3u8
-#EXTINF:-1 tvg-name="NASA TV Public" tvg-logo="https://i.imgur.com/rmyfoOI.png" tvg-id="NASATVPublic.us" tvg-chno="8" tvg-country="US" group-title="USA",NASA TV Public
-https://ntv1.akamaized.net/hls/live/2014075/NASA-NTV1-HLS/master_2000.m3u8
 #EXTINF:-1 tvg-name="NASA TV Media" tvg-logo="https://i.imgur.com/rmyfoOI.png" tvg-id="NASATVMedia.us" tvg-chno="9" tvg-country="US" group-title="USA",NASA TV Media
 https://ntv2.akamaized.net/hls/live/2013923/NASA-NTV2-HLS/master.m3u8
 #EXTINF:-1 tvg-name="BBC Food" tvg-logo="https://i.imgur.com/N3xiz4m.png" tvg-id="BBCFood.us" tvg-chno="1" tvg-country="US" group-title="USA",BBC Food