refactor: apply review comments

test/seeds_test.exs

@@ -31,7 +31,10 @@ defmodule Mv.SeedsTest do
   setup do
     system_actor = Mv.Helpers.SystemActor.get_system_actor()
 
-    # Run seeds only once per test run (check process dictionary)
+    # Run seeds once per test process (due to sandbox isolation, each test runs in its own process)
+    # Process.get/put ensures seeds are only executed once per test process, not once per test
+    # Note: With async: false and sandbox isolation, this effectively runs seeds once per test,
+    # but the guard prevents multiple executions within the same test process if setup is called multiple times
     unless Process.get(@seeds_run_key) do
       Code.eval_file("priv/repo/seeds.exs")
       Process.put(@seeds_run_key, true)
@@ -55,7 +58,7 @@ defmodule Mv.SeedsTest do
     end
 
     test "is idempotent when run multiple times", %{actor: actor} do
-      # Seeds already run once in setup_all - count current state
+      # Seeds already run once in setup - count current state
       {:ok, users_count_1} = Ash.read(Mv.Accounts.User, actor: actor)
       {:ok, members_count_1} = Ash.read(Mv.Membership.Member, actor: actor)