feat(memoir): 回忆录分段两阶段管线（Phase1 分类 / Phase2 叙事）与配置、测试

api/app/agents/memoir/extraction_agent.py

@@ -10,6 +10,7 @@ from dataclasses import dataclass
 from typing import Any, Dict
 
 from app.agents.memoir.prompts import get_state_extraction_prompt
+from app.agents.stage_constants import normalize_chat_stage
 from app.core.langchain_llm import invoke_json_object
 from app.core.logging import get_logger
 from app.core.json_utils import extract_json_payload
@@ -63,7 +64,11 @@ class ExtractionAgent:
                 agent="ExtractionAgent.extract",
             )
             parsed = json.loads(extract_json_payload(raw))
-            detected_stage = parsed.get("detected_stage", detected_stage)
+            raw_detected = parsed.get("detected_stage", detected_stage)
+            detected_stage = normalize_chat_stage(
+                str(raw_detected) if raw_detected is not None else None,
+                fallback=current_stage,
+            )
             raw_slots = parsed.get("slots", {}) or {}
             extracted_slots = {
                 k: v if isinstance(v, str) else str(v) for k, v in raw_slots.items()