feat(schema): D-237 specialization columns + specialization_vocabulary table
Ticket #1011. system_economy gains economic_specialization +
cultural_specialization (TEXT, NULL = heuristic fallback); new
specialization_vocabulary table (specialization_id PK, commodity_id
FK->commodities, production_ubiquity_override, projected BulkClass +
ProductionUbiquity for D-233, description) + commodity index. Columns
mirrored into COLUMN_MIGRATIONS for idempotent migration; table rides
systems-schema.sql. dominant_faction already exists on system_factions
(populate-only). Validated: importer parses; schema applies to scratch DB;
idempotent migration ran 2x on a copy of live systems.db, 301 rows preserved.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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