Directory where bulk parquet is written on its way to GCS. Read from the
CALCOFI_STAGE_DIR environment variable, falling back to ~/_big/calcofi.
Details
Set this in ~/.Renviron to a path that is neither a git working tree nor
a synced cloud folder — a 24 GB tree inside either one is a problem for
that tool, not a feature:
The fallback keeps a fresh clone working without setup. It is deliberately outside the repo, so the failure mode of forgetting to set the variable is "writes to an unexpected but harmless place", never "writes 24 GB back into git".