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Three-layer organization: primary topic (one per article, for ranking and brief balance) + grouping tags (1-4 per article from a controlled vocabulary, the organic "wandering" axis) + tonal flavor. - taxonomy: add technology + learning topics; 4 calm tag families (Discovery & Wonder, People & Kindness, Solutions & Progress, Mind & Craft) defined in code, not the DB; ALLOWED_TAGS union + coerce_tags validation. - db: article_tags(article_id, tag) join table + tag index. - llm: tags added to the classifier json_schema (enum-constrained, maxItems 4) and system prompt; normalize_scores coerces tags; upsert_article_score replaces a row's tags atomically on every (re)classification. - queries: feed gains a tag filter and exposes tags via group_concat; tag_counts. - api: Article.tags, feed tag param, and /api/families with per-tag counts. - tests: coerce/normalize/upsert/tag-filter/reclassify-replace/tag_counts + /api/families. 99 passing. Corpus reclassify (re-tag + new primary topics) runs separately against the local LLM. Frontend (B2) pairs with this; the live site is unchanged until then. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>