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Centralize taxonomy module (lib/taxonomy)
Architecture
Situation
Current state: four separate taxonomy definitions exist across BCs with inconsistent types (e.g., `Art`, `Research` not in schema), three different color formats with no conversion utilities, and duplicated emoji mappings. Target: a single lib/taxonomy module imported by achievements, OG, pills, and agent; HSL and Tailwind color formats with derivation utilities; a DB-ready structure that simplifies migration to a taxonomy table later.
Action
Consolidate scattered taxonomy definitions into a single authoritative module (lib/taxonomy) to standardize types, color formats, and emoji mappings across multiple BCs.
Outcome
Create one canonical taxonomy source that exports DB-ready structures and utilities for HSL ↔ Tailwind color derivation, ensuring consistent types and removing duplicated emoji mappings.
taxonomydesign-systemcolors