M3a：息壤三级记忆域——归真触发提取管线/白名单明忆/重忆确认/正影版本链/删除墓碑/双通道召回注入，退役旧记忆-抽取-反思-大周天-演化管线（迁移 004，验收 7 用例）

backend/app/domains/xirang/__init__.py

@@ -0,0 +1,25 @@
+"""息壤（记忆域）：三级记忆、实录与召回（data-model.md §3）。"""
+
+from app.domains.xirang.service import (
+    confirm_memory,
+    correct_memory,
+    delete_memory,
+    deny_memory,
+    memorize_node,
+    on_canonized,
+    place_candidates,
+    recall_for_generation,
+    record_factual,
+)
+
+__all__ = [
+    "confirm_memory",
+    "correct_memory",
+    "delete_memory",
+    "deny_memory",
+    "memorize_node",
+    "on_canonized",
+    "place_candidates",
+    "recall_for_generation",
+    "record_factual",
+]