# Mock 推理引擎：Phase 2 空壳运行时的占位

async def mock_reasoning_chain(prd_text: str, skill_name: str = "default") -> dict:
    """模拟完整的推理链路，返回占位数据"""
    return {
        "ir_yaml": f"# Mock IR generated for PRD ({len(prd_text)} chars)\nfeatures: []",
        "validation": {"valid": True, "issues": []},
        "testcases": [],
    }