"""Phase 3 entrypoint: build + persist the FAISS retrieval index.

Usage:  python scripts/03_build_index.py
Reads data/processed/train.parquet, writes the index to data/index/.
"""
import sys
from pathlib import Path

sys.path.append(str(Path(__file__).resolve().parents[1]))
from src.rag.embedder import build_index_from_processed

if __name__ == "__main__":
    print("=" * 60, "\nPHASE 3: BUILD RETRIEVAL INDEX\n", "=" * 60, sep="")
    build_index_from_processed()