"""Export the hand-authored HackPairs from src/vgrout/pairs.py to a named JSON.

These are 18 hand-crafted (hack, clean) pairs where both completions share the
same solution body but differ only in whether run_tests() uses real assert vs
fake/commented tests. They are the smallest, highest-precision pairset.

Run:
    uv run python scripts/pairset_build_authored.py
Output:
    out/pairsets/pairs_authored.json
"""
import json
from dataclasses import asdict
from pathlib import Path

from vgrout.pairs import PAIRS

out = Path("out/pairsets/pairs_authored.json")
out.parent.mkdir(parents=True, exist_ok=True)
out.write_text(json.dumps([asdict(p) for p in PAIRS]))
print(f"wrote {len(PAIRS)} pairs -> {out}")