test(spp_programs): add core model and wizard tests (254 → 406 tests)

Add comprehensive test coverage for the biggest gaps:

- test_cycle.py: +37 tests for cycle workflow (state transitions,
  computed fields, prepare_entitlement, submit/approve/reject,
  unlink restrictions, UI actions, legacy aliases)
- test_programs.py: +30 tests for program model (manager setup,
  get_manager, create_new_cycle, enrollment hooks, fund balance,
  beneficiary queries, manager constraints)
- test_program_membership.py: new file with 23 tests (state
  transitions, enrollment/exit dates, duplicate prevention,
  unlink restrictions, deduplication status, cycle membership)
- test_rejection_wizards.py: new file with 10 tests (cash/inkind
  rejection, reset-to-pending, rejection reason, state guards)

Author: gonzalesedwin1123

spp_programs/tests/__init__.py

@@ -21,4 +21,6 @@
 from . import test_entitlement_amount_cel_advanced
 from . import test_entitlement_condition_cel
 from . import test_entitlement_manager_inkind
+from . import test_rejection_wizards
+from . import test_program_membership
 # test_cycle_auto_approve_fund_check: needs rewrite for approval mixin workflow