fix(news): quitar feed Espacio Misterio (XML malformado)

El feed devuelve 'not well-formed (invalid token)' en cada poll desde la
activación; feedparser nunca extrae entries (bozo). Se elimina para no
generar un warning por tick. Quedan 6 feeds.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/news/monitor.py

@@ -21,7 +21,6 @@ UA = "ExclusionZone-NewsBot/1.0 (+https://theexclusionzone.com)"
 
 FEEDS: list[dict] = [
     {"name": "Gran Misterio",      "url": "https://granmisterio.org/feed/",                                                     "lang": "es"},
-    {"name": "Espacio Misterio",   "url": "https://www.espaciomisterio.com/feed/",                                              "lang": "es"},
     {"name": "Josep Guijarro (YT)", "url": "https://www.youtube.com/feeds/videos.xml?channel_id=UCIlGy26zi-BbX6zDYAMQ9Qg",      "lang": "es"},
     {"name": "r/UFOs",             "url": "https://www.reddit.com/r/UFOs/new/.rss",                                             "lang": "en"},
     {"name": "r/UFOB",             "url": "https://www.reddit.com/r/UFOB/new/.rss",                                             "lang": "en"},