Remove HR module; provision agent sessions via /employees

backend/app/models/__init__.py

@@ -1,8 +1,7 @@
+from app.models.activity import Activity
 from app.models.org import Department, Employee
 from app.models.projects import Project, ProjectMember
 from app.models.work import Task, TaskComment
-from app.models.hr import HeadcountRequest, EmploymentAction
-from app.models.activity import Activity
 
 __all__ = [
     "Department",
@@ -11,7 +10,5 @@ __all__ = [
     "ProjectMember",
     "Task",
     "TaskComment",
-    "HeadcountRequest",
-    "EmploymentAction",
     "Activity",
 ]