feat: pace startup housekeeper runs

tests/test_rules.py

@@ -4,11 +4,25 @@ from datetime import date
 
 import pytest
 
+import ccma.services.housekeeper as housekeeper_module
 from ccma.rules.loader import RuleLoadError
 from ccma.services.housekeeper import Housekeeper
 from ccma.storage.repository import MemberRepository
 
 
+def test_housekeeper_optionally_waits_between_members(tmp_path, monkeypatch) -> None:
+    repository = MemberRepository(tmp_path)
+    repository.initialize()
+    repository.create_member(first_name="First", last_name="Member")
+    repository.create_member(first_name="Second", last_name="Member")
+    delays: list[float] = []
+    monkeypatch.setattr(housekeeper_module.time, "sleep", delays.append)
+
+    Housekeeper(repository).run(today=date(2026, 6, 21), member_delay=0.25)
+
+    assert delays == [0.25]
+
+
 def test_store_rule_overrides_builtin_rule_with_same_filename(tmp_path) -> None:
     repository = MemberRepository(tmp_path)
     repository.initialize()