"""Preprocess phase — load → validate → enrich → materialize → expand.

Shipped: load + validate. The phase is orchestrated by ``pipeline.run_preprocess`` over a list of small
frame→frame ``Stage``s (``pipeline.preprocess_stages``) so each sub-stage is independently debuggable.
"""

from .load import load_candidates, to_date
from .materialize import materialize
from .pipeline import DATASET_AS_OF, Stage, preprocess_stages, run_preprocess
from .quality import quality
from .validate import FLAG_COLUMNS, validate

__all__ = [
    "DATASET_AS_OF",
    "FLAG_COLUMNS",
    "Stage",
    "load_candidates",
    "materialize",
    "preprocess_stages",
    "quality",
    "run_preprocess",
    "to_date",
    "validate",
]