fix(M6): agents/tools-Endpoint — list_for_api statt nichtexistenter list_tools (#364)

- Vorbestands-Bug (live gemessen: 500 "ToolRegistry has no attribute list_tools"):
  automation/agent_routes.py rief registry.list_tools() auf, ToolRegistry
  bietet get_all()/list_for_api() — Route auf list_for_api() mit korrektem
  Feld-Mapping (plugin_name -> plugin) umgestellt
- Regressionstest gesichert (test_agents_tools_route_uses_list_for_api)
- M6-Suite 8/8 gruen

tests/test_m6_miniapp_hosts.py

@@ -169,3 +169,17 @@ class TestAgentLoopContext:
 
         src = inspect.getsource(agent_loop)
         assert '"agent_name"' in src, "tool_context must include agent_name"
+
+
+def test_agents_tools_route_uses_list_for_api():
+    """M6 verification blocker fixed: /api/v1/agents/tools used to call
+    registry.list_tools() (nonexistent — 500 on production, pre-existing).
+    The route must use list_for_api() with the correct field mapping.
+    """
+    import inspect
+
+    from app.plugins.builtins.automation.agent_routes import list_tools
+
+    src = inspect.getsource(list_tools)
+    assert "list_for_api()" in src, "route must use list_for_api()"
+    assert "list_tools()" not in src.replace("list_for_api()", "")