#!/usr/bin/env python3
"""Harness for empty-sha-check demo: run skill, require exit 0 and match=True in stdout."""
import hashlib, subprocess, sys
cmd = ["python3", "smutyan_demo_skill.py"]
p = subprocess.run(cmd, capture_output=True, text=True)
print(p.stdout, end="")
print(p.stderr, end="", file=sys.stderr)
ok = p.returncode == 0 and "match=True" in p.stdout
sys.exit(0 if ok else 1)