Blame a GDELT export only while GDELT answers, and fix the review's notes

An export is given up on (never published, unreadable, or failing three
times) only while GDELT itself answers: its list of exports read, or
another export of the same round read. An outage that answers 404, or junk,
for everything now gives up on nothing, and a failing file earns one strike
a round rather than three within the first seconds' rounds.

Docs: News's share token is 9; territories without a country code are named
as themselves too; the changelog fragment credits one pull request. Unused
exports dropped from the rules and stale scaffolding from the ledger tests.

.env.example

@@ -317,6 +317,7 @@ GEMINI_CHAT_MODEL=gemini-3.5-flash-lite
 # Each reserves up to 40 stations within the existing 750-station directory.
 # Restart after changing. Leave blank for the existing global selection.
 # RADIO_PRIORITY_COUNTRIES=IN,PL
+
 # Optional: a news server for the News layer (its /api/news/hotspots, /feed
 # and /outline routes), such as https://news.example. The local server
 # forwards only the layer's own GET requests there, with a 15 s timeout. Set,