news digest (spec-013): rss/atom -> {news} file via cron

Replaces the broken pre-1.0-openai news_feed.py. Stdlib parsing with
defusedxml (feeds are untrusted XML), titles sanitized (SAF-03), feed
URLs SSRF-guarded. CLI: python -m fjerkroa_bot.news --config <cfg>.

config.toml

@@ -80,3 +80,15 @@ enable-game-info = true
 # Ops (SPEC-012): consecutive OpenAI failures before a staff alert
 # api-error-alert-threshold = 5
 # Backups: cron runs deploy/backup_db.py daily -> ~/backups/<bot>/ (keep 14)
+
+# News digest (SPEC-013) — `python -m fjerkroa_bot.news --config X.toml` via cron;
+# writes the {news} file. Feeds are [url, label] pairs (RSS or Atom):
+# news = "news_feed.txt"
+# news-per-feed = 3
+# news-max-items = 15
+# news-feeds = [
+#   ["https://blog.playstation.com/feed/", "PS"],
+#   ["https://kotaku.com/rss", "Kotaku"],
+#   ["https://www.pushsquare.com/feeds/latest", "Push"],
+#   ["https://mein-mmo.de/feed/", "MeinMMO"],
+# ]