feat: add agent registry manifests and coverage

Introduce a manifest-backed agent registry surface and align graph tests with the new runtime prompt and tool indexing behavior.

backend/app/agents/graph.py

@@ -62,17 +62,40 @@ def _filter_user_messages(messages: list[BaseMessage]) -> list[BaseMessage]:
     return [m for m in messages if m.type in ("human", "user")]
 
 
+def _dedupe_tools_by_name(tools: list) -> list:
+    deduped_tools = []
+    seen_tool_names: set[str] = set()
+    for tool in tools:
+        if tool.name in seen_tool_names:
+            continue
+        deduped_tools.append(tool)
+        seen_tool_names.add(tool.name)
+    return deduped_tools
+
+
 def _get_role_tools(role: AgentRole) -> list:
     """获取角色对应的所有可用工具集"""
     if role == AgentRole.SCHEDULE_PLANNER:
         # 合并分析和规划工具
-        return list(set(SUB_COMMANDER_TOOLSETS["schedule_analysis"] + SUB_COMMANDER_TOOLSETS["schedule_planning"]))
+        return _dedupe_tools_by_name(
+            SUB_COMMANDER_TOOLSETS["schedule_analysis"]
+            + SUB_COMMANDER_TOOLSETS["schedule_planning"]
+        )
     if role == AgentRole.EXECUTOR:
-        return list(set(SUB_COMMANDER_TOOLSETS["executor_tasks"] + SUB_COMMANDER_TOOLSETS["executor_forum"]))
+        return _dedupe_tools_by_name(
+            SUB_COMMANDER_TOOLSETS["executor_tasks"]
+            + SUB_COMMANDER_TOOLSETS["executor_forum"]
+        )
     if role == AgentRole.LIBRARIAN:
-        return list(set(SUB_COMMANDER_TOOLSETS["librarian_retrieval"] + SUB_COMMANDER_TOOLSETS["librarian_graph"]))
+        return _dedupe_tools_by_name(
+            SUB_COMMANDER_TOOLSETS["librarian_retrieval"]
+            + SUB_COMMANDER_TOOLSETS["librarian_graph"]
+        )
     if role == AgentRole.ANALYST:
-        return list(set(SUB_COMMANDER_TOOLSETS["analyst_progress"] + SUB_COMMANDER_TOOLSETS["analyst_insights"]))
+        return _dedupe_tools_by_name(
+            SUB_COMMANDER_TOOLSETS["analyst_progress"]
+            + SUB_COMMANDER_TOOLSETS["analyst_insights"]
+        )
     return []