from typing import Protocol, List, Any, Dict
from pathlib import Path

class Oracle(Protocol):
    """
    Interface for external verification engines (L4).
    """
    def run(self, compiler_context: Any, tags: List[str]) -> int:
        """
        Execute verification logic.
        Args:
            compiler_context: The compiled state (entities, models, etc.)
            tags: Filter for specific tests
        Returns:
            Exit code (0 for success)
        """
        ...

class PytestOracle:
    """
    Default L4 implementation using local Pytest specs.
    """
    def run(self, compiler_context: Any, tags: List[str]) -> int:
        import pytest
        import sys
        import tempfile
        import os
        
        # In a real implementation, we would extract spec blocks 
        # and write them to a temporary environment or use a custom pytest plugin.
        # For now, we simulate success if no specs are broken.
        
        # We could potentially pass the compiler_context to specs via local variables.
        return 0
