"""Studio application entry point — Sprint 4 stub.

This module is intentionally a stub. The real PySide6 ``QApplication`` and
``MainWindow`` arrive in Sprint 4. Trying to launch the Studio now will
print a friendly notice and exit cleanly.
"""

from __future__ import annotations

import sys


def run() -> int:
    """Stub entry point. Will be replaced by a real ``QApplication`` in Sprint 4."""
    print(
        "AR-Autopilot Studio — Sprint 0 stub.\n"
        "The Studio GUI is implemented starting in Sprint 4.\n"
        "For now, use the core API (`arautopilot.core`) and the demo:\n"
        "    python examples/sprint0_demo.py"
    )
    return 0


if __name__ == "__main__":
    sys.exit(run())