Add 5 new tables: gate_links (668 bidirectional edges from star-map.json),
commodities (36 types from commodities.toml), production_chains (21
Leontief recipes), chain_inputs (52 input requirements), corp_presence
(empty, populated by future pipeline). Add currency_zone column to
star_systems (D-172), archetype columns to corporations (D-175).
New import pipeline: tooling/economy-db/import_economics.py reads
TOML/JSON source files and populates the DB. Idempotent — safe to
rerun via `make economy-db`.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>