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>

server/data/systems-schema.sql

@@ -98,7 +98,10 @@ CREATE TABLE IF NOT EXISTS system_economy (
     economic_base_primary TEXT,
     economic_base_secondary TEXT,
     distribution_index TEXT,
-    imprint_access TEXT
+    imprint_access TEXT,
+    -- D-237 authored specialization layer (build-time; NULL = heuristic fallback)
+    economic_specialization TEXT,   -- value in specialization_vocabulary.specialization_id
+    cultural_specialization TEXT    -- activity- or heritage-type value; drives D-232 template pool (distinct from system_culture.cultural_register)
 );
 
 -- Faction presence
@@ -269,6 +272,20 @@ CREATE TABLE IF NOT EXISTS commodities (
     updated_at TEXT DEFAULT (datetime('now'))
 );
 
+-- D-237 authored specialization layer: economic-specialization vocabulary.
+-- Each value maps to a commodity + projected (BulkClass, ProductionUbiquity) for D-233.
+-- Scale is encoded in the value (breadbasket vs estate_farming); no separate scale column.
+-- Compiled from wiki/economics/specialization_vocabulary.toml by import_economics.py.
+CREATE TABLE IF NOT EXISTS specialization_vocabulary (
+    specialization_id            TEXT PRIMARY KEY,
+    commodity_id                 TEXT NOT NULL REFERENCES commodities(commodity_id),
+    production_ubiquity_override  TEXT,           -- NULL = use the commodity's catalog default
+    bulk_class_projected         TEXT NOT NULL,   -- pre-computed BulkClass for D-233
+    production_ubiquity_projected TEXT NOT NULL,  -- pre-computed ProductionUbiquity for D-233
+    description                  TEXT NOT NULL
+);
+CREATE INDEX IF NOT EXISTS idx_spec_vocab_commodity ON specialization_vocabulary(commodity_id);
+
 -- Leontief production chain recipes (D-178)
 -- Source: wiki/economics/production_chains.toml
 CREATE TABLE IF NOT EXISTS production_chains (