d667586597
Consolidate duplicated _extract_core_subject() (7 copies across bird_x, reddit, youtube_yt, tiktok, instagram, bluesky, scrapecreators_x) into query.extract_core_subject() with parameterized noise set, max_words, and suffix stripping. Consolidate duplicated _tokenize/_compute_relevance/STOPWORDS/SYNONYMS (4 copies across youtube_yt, tiktok, instagram, scrapecreators_x) into relevance.token_overlap_relevance() with hashtag-aware matching. Integration into per-module imports follows in next commits.