ACCEPTANCE CRITERIA (15/15)

☑ 1. Script `scripts/fetch-bcb-data.js` fetches 6 BCB SGS series (selic/432, usd_brl/1, ipca/433, igpm/189, pib/4380, industrial_production/21859) from config

☑ 2. Each series is fetched independently -- failure in one does not block others (FR-06)

☑ 3. Output `data/state/bcb-latest.json` with all indicator values, timestamps, statuses, and error array

☑ 4. Output appends to `data/timeseries/bcb-indicators.json` via `appendToSeries()` with dedup by `date_iso` (FR-07)

☑ 5. BCB date format `DD/MM/YYYY` is converted to ISO `YYYY-MM-DD`

☑ 6. BCB `valor` string is parsed to float

☑ 7. Supports `--dry-run` flag (preview without writing files)

☑ 8. Supports `--verbose` flag (debug-level logging)

☑ 9. Supports `--help` flag (shows usage information)

☑ 10. Supports `--series selic,ipca` flag (fetch only specified series)

☑ 11. Uses rate limiter at 1 req/sec via `createLimiter(1)`

☑ 12. Exit code 0 on partial or full success, exit code 1 if ALL series fail

☑ 13. Prints summary to stdout: "Completed: X/6 series OK"

☑ 14. No API key required (BCB SGS is open)

☑ 15. Uses `ultimos/{n}` endpoint format to avoid 10-year window limitation