Update rota configuration for February 2026 and refine shift constraints handling

gen_cons.py

@@ -482,7 +482,7 @@ def main(
         weeks_to_rota=weeks,
         balance_offset_modifier=bom,
         use_previous_shifts=True,
-        name="cons rota feb 2026 run 1",
+        name="cons rota feb 2026 run 2",
         allow_force_assignment_with_leave_conflict=True,
         constraint_options=RotaConstraintOptions(
             balance_weekends=True,
@@ -510,7 +510,8 @@ def main(
             assign_as_block=False,
             constraints=[
                 PreShiftConstraint(days=2, start_date="2025-11-17", exclude_days=("Fri", "Sat", "Sun"), exclude_dates=["2026-04-06", "2026-05-04", "2026-05-25"]),
-                PostShiftConstraint(days=1, start_date="2025-11-17", exclude_days=("Fri", "Sat", "Sun"), allow_self=True),
+                PreShiftConstraint(days=1, start_date="2025-11-17", exclude_days=("Fri", "Sat", "Sun"), allow_self=False),
+                MaxShiftsPerWeekConstraint(max_shifts=1, days=days[:5]),
             ],
         ),
         SingleShift(
@@ -529,6 +530,7 @@ def main(
         SingleShift(
             sites=("rota b", "rota c"),
             name="weekend b",
+            end_date="2026-07-20",
             workers_required=1,
             length=12.5,
             days=days[5:],