refactor(pipeline): split core/pipeline.py into cohesive package

Behavior-preserving package split of the 867-line pipeline.py:
- _llm_config.py: _get_llm_config_from_context
- base.py: AnalysisStep ABC
- steps.py: the five concrete AnalysisStep implementations
- executor.py: AnalysisPipeline orchestrator
- tags.py: sanitize_tag
__init__.py re-exports the full public surface. All 17 defs/classes
verified byte-identical via AST. 97 passed / 2 skipped, ruff clean.

Author: bx33661

pure_auto_codeql/core/pipeline/__init__.py

@@ -0,0 +1,27 @@
+"""分析流水线模块
+提供分析步骤的定义和流水线执行功能。
+"""
+
+from ._llm_config import _get_llm_config_from_context
+from .base import AnalysisStep
+from .executor import AnalysisPipeline
+from .steps import (
+    CodeQLGenerationStep,
+    CVEAnalysisStep,
+    PathAnalysisStep,
+    SinkAnalysisStep,
+    SourceAnalysisStep,
+)
+from .tags import sanitize_tag
+
+__all__ = [
+    "AnalysisStep",
+    "AnalysisPipeline",
+    "CVEAnalysisStep",
+    "SinkAnalysisStep",
+    "SourceAnalysisStep",
+    "PathAnalysisStep",
+    "CodeQLGenerationStep",
+    "sanitize_tag",
+    "_get_llm_config_from_context",
+]

pure_auto_codeql/core/pipeline/_llm_config.py

@@ -0,0 +1,28 @@
+"""流水线的 LLM 配置解析。"""
+
+from typing import Any
+
+from ..context import AnalysisContext
+
+
+def _get_llm_config_from_context(context: AnalysisContext, role) -> Any:
+    """从上下文中获取LLM配置，支持配置中的模型、API Key和Base URL"""
+    config = getattr(context, '_config', None)
+    if not config:
+        from pure_auto_codeql.configuration import LLMRole, get_resilient_llm_config
+        return get_resilient_llm_config(role)
+
+    from pure_auto_codeql.configuration import LLMRole, get_llm_config
+    # 从配置中获取参数
+    provider = config.llm_provider
+    model_name = config.think_model if role == LLMRole.THINK else config.chat_model
+    api_key = config.api_key
+    base_url = config.base_url
+
+    return get_llm_config(
+        role,
+        provider_name=provider,
+        model_name=model_name,
+        api_key=api_key,
+        base_url=base_url
+    )

pure_auto_codeql/core/pipeline/base.py

@@ -0,0 +1,19 @@
+"""分析步骤抽象基类。"""
+
+from abc import ABC, abstractmethod
+from typing import Any
+
+from ..context import AnalysisContext
+
+
+class AnalysisStep(ABC):
+    """分析步骤抽象基类。"""
+
+    def __init__(self, name: str, agent_name: str = None):
+        self.name = name
+        self.agent_name = agent_name or name
+
+    @abstractmethod
+    async def execute(self, context: AnalysisContext) -> Any:
+        """执行分析步骤。"""
+        pass