* feat(intelligence): add countryCode geo-attribution to topStories (#2051)
* fix(geo-extract): filter EU as supranational, add unigram stopwords, type countryCode in ServerInsightStory
- Map 'eu'/'europe' to 'XX' (supranational marker, returns null) instead of 'EU' which is not a valid ISO2 code and would be silently ignored by downstream CII scorer
- Add UNIGRAM_STOPWORDS set for high-false-positive single-word entries in country-names.json: chad/jordan/georgia/niger/guinea/mali/peru — these match too frequently as person names and US state names in English headlines; their country meanings are covered by unambiguous aliases (nigerian, georgian context via bigrams, etc.)
- Add countryCode: string | null and pubDate: string to ServerInsightStory TypeScript interface to match what seed-insights.mjs now writes to Redis
* fix(geo-extract): add 'us' to UNIGRAM_STOPWORDS to prevent pronoun false positives
'us' as a bare word matches almost every English headline ("give us",
"tells us", etc.). US coverage is preserved via the 'washington' and
'american' aliases in ALIAS_MAP.
* fix(geo-extract): fix US abbreviation, bigram punctuation, and scan ordering
Three issues:
1. 'us' stopword suppressed uppercase US (country). Fix: pre-process
\bUS\b → 'United States' before lowercasing; remove 'us' from stopwords.
2. Bigram matching used raw tokens so 'West Bank,' and 'Tel Aviv:' missed
their alias entries. Fix: strip punctuation from each token before
forming the bigram key.
3. Two-pass scan (all bigrams then all unigrams) meant 'United States'
bigram fired before earlier unigrams like 'Iran' in 'Iran blames US'.
Fix: single left-to-right scan with local longest-match (bigram at i
before unigram at i), preserving first-mention document order.
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