M3b：世谱激活接入组装管线（关键词命中/常驻/预算/符文展开）与前端记忆治理页（候选箱/重忆确认/正影/删除/实录溯源）

backend/app/domains/mirror_tree/service.py

@@ -426,6 +426,15 @@ async def build_generation_prompt(
         if recalled:
             memory_lines = [f"- {m.content}" for m in recalled]
             parts.append(f"【获准记忆（来源可查）】\n" + "\n".join(memory_lines))
+        # 世谱激活（河图）：关键词命中扫描近期文本，常驻条目恒注入；预算内按 insertion_order
+        tree_character_id = await _tree_character_id(question.tree_id)
+        activated = await _activate_lorebook(
+            tree_character_id,
+            scan_text=f"{transcript[-600:]}\n{question.content}",
+            expand=(lambda t: render(t, ctx, registry=registry)),
+        )
+        if activated:
+            parts.append("【世界认知（世谱命中）】\n" + "\n".join(f"- {line}" for line in activated))
     if transcript:
         parts.append(f"【共同经历（祖先路径）】\n{transcript}")
     parts.append(f"【当前问题】\n{expand(question.content)}")
@@ -899,3 +908,56 @@ async def _tree_character_id(tree_id: str) -> str:
     async with AsyncSessionLocal() as session:
         tree = await session.get(MirrorTree, tree_id)
         return tree.character_id if tree else ""
+
+
+async def _activate_lorebook(
+    character_id: str,
+    *,
+    scan_text: str,
+    expand=None,  # noqa: ANN001 — 符文展开函数（char/user 名），无上下文时不展开
+    char_budget: int = 600,
+) -> list[str]:
+    """世谱激活管线（mirror-tree PRD 借 ST 范式）：关键词命中 + 常驻，预算内按插入序。
+
+    扫描范围为近期文本（祖先链尾部 + 当前问题）；条目内容经符文展开后注入。
+    次级键逻辑、递归扫描与时序效果（sticky/cooldown）随 M5 循环轮次状态接入。
+    """
+    from sqlalchemy import select
+
+    from app.models.lorebook import Lorebook, LorebookEntry
+
+    text = "".join(scan_text.lower().split())
+    async with AsyncSessionLocal() as session:
+        books = (
+            await session.execute(
+                select(Lorebook.id).where(
+                    Lorebook.character_id == character_id, Lorebook.status == "active"
+                )
+            )
+        ).scalars().all()
+        if not books:
+            return []
+        entries = (
+            (
+                await session.execute(
+                    select(LorebookEntry)
+                    .where(LorebookEntry.lorebook_id.in_(tuple(books)), LorebookEntry.enabled.is_(True))
+                    .order_by(LorebookEntry.insertion_order)
+                )
+            )
+            .scalars()
+            .all()
+        )
+    picked: list[str] = []
+    used = 0
+    for entry in entries:
+        keys = [k.lower() for k in json.loads(entry.keys_json or "[]") if k]
+        hit = entry.constant or any("".join(k.split()) in text for k in keys)
+        if not hit:
+            continue
+        content = entry.content if expand is None else expand(entry.content)
+        if used + len(content) > char_budget:
+            continue
+        picked.append(content)
+        used += len(content)
+    return picked