test: move slow and less critical tests to nightly suite

test/seeds_test.exs

@@ -44,6 +44,7 @@ defmodule Mv.SeedsTest do
   end
 
   describe "Seeds script" do
+    @tag :slow
     test "runs successfully and creates basic data", %{actor: actor} do
       # Smoke test: verify seeds created essential data structures
       {:ok, users} = Ash.read(Mv.Accounts.User, actor: actor)
@@ -57,6 +58,7 @@ defmodule Mv.SeedsTest do
       assert length(roles) >= 5, "Seeds should create at least 5 authorization roles"
     end
 
+    @tag :slow
     test "is idempotent when run multiple times", %{actor: actor} do
       # Seeds already run once in setup - count current state
       {:ok, users_count_1} = Ash.read(Mv.Accounts.User, actor: actor)