First cut of the reproducible FCC synthetic data factory.
Includes: SQLite schema (customers, accounts, cash_transactions, alerts) and stdlib-only CLI (init-db, generate). Deterministic generators with --seed.
Sample DB: fcc_tm.sqlite built with:
python -m src init-db --db data/fcc_tm.sqlite
python -m src generate --db data/fcc_tm.sqlite --n-customers 1500 --n-externals 1000 --n-accounts 1300 --n-transactions 200000 --seed 42