fix(toolset): 工具传递改为展开的 tools 列表，不再用 FunctionToolset 包装

前端/DB 仍用 toolset 做逻辑分组管理，但传给 pydantic-ai Agent 时
把 toolset 内的 callable 展开为 tools=[] 扁平列表，MCP server 等
需要 toolset 语义的单独走 toolsets=[] 参数。解决工具"存在但调不了"的问题。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/unit/test_gsm_snapshot.py

@@ -308,13 +308,13 @@ async def test_fetch_snapshot_use_cache_false_skips_cache(monkeypatch):
     assert result is fresh
 
 
-# ─── build_toolsets_for_scope 客户端 helper ────────────────────────
+# ─── build_tools_for_scope 客户端 helper ────────────────────────
 
 
-def test_build_toolsets_for_scope_assembles_system_and_custom():
-    """客户端按 snapshot 的 custom_toolsets + all_funcs 现场组装。"""
+def test_build_tools_for_scope_assembles_system_and_custom():
+    """客户端按 snapshot 的 custom_toolsets + all_funcs 展开为扁平 callable 列表。"""
     from kilostar.core.global_state_machine.gsm_snapshot import (
-        build_toolsets_for_scope,
+        build_tools_for_scope,
     )
 
     def _sys_default():
@@ -334,20 +334,19 @@ def test_build_toolsets_for_scope_assembles_system_and_custom():
         },
     )
 
-    result = build_toolsets_for_scope(snap, "control_node")
-    assert len(result) == 2
-    ids = [getattr(t, "id", None) for t in result]
-    assert ids == ["toolset::system_basic", "toolset::grp"]
+    result = build_tools_for_scope(snap, "control_node")
+    assert len(result) == 3
+    assert result == [_sys_default, _sys_scope, _tp_a]
 
 
-def test_build_toolsets_for_scope_skips_empty_buckets():
-    """没有工具的 scope 不应产出 toolset，避免空 FunctionToolset 噪声。"""
+def test_build_tools_for_scope_skips_empty_buckets():
+    """没有工具的 scope 返回空列表。"""
     from kilostar.core.global_state_machine.gsm_snapshot import (
-        build_toolsets_for_scope,
+        build_tools_for_scope,
     )
 
     snap = GSMSnapshot(
         all_funcs={},
         custom_toolsets={},
     )
-    assert build_toolsets_for_scope(snap, "control_node") == []
+    assert build_tools_for_scope(snap, "control_node") == []