New variables: KOSPI, GOVT_10Y, IMPORT_PRICE, DISHONOR_RATE,
HOUSING_PRICE, HOUSEHOLD_DEBT, IMPORT_AMT, USDKRW, CSI, M2
- CSV cache: data/cache/macro_ecos.csv (no repeated API calls)
- --force to refresh, --no-api for fallback only
- 26 years (2000-2025) fallback data for all variables