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feat(news): replace keyword sentiment with VADER
vaderSentiment==3.3.2 added to requirements.txt.

_score_headlines now:
- scores each article (title + description) with VADER compound ∈ [-1, +1]
- filters out articles with |compound| ≤ 0.05 (no clear signal)
- weights remaining articles by recency (GNews newest-first, rank 0 → highest weight)
- returns weighted mean clamped to [-1, +1]

Removes the custom keyword sets (_POSITIVE/_NEGATIVE) and the set-based
bag-of-words algorithm that capped scores at ~±0.5 in practice.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-14 12:42:19 +00:00
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