refactor(jobs): address code review feedback on fp.work.centre

- ACL: use group_fusion_plating_operator for read-only tier instead of
  base.group_user, matching the established hierarchy in the rest of
  ir.model.access.csv
- Test: rename test_facility_required_for_active_centre →
  test_facility_optional_at_create. Old name claimed the opposite of
  what the assertion checks.
- Manifest version bumped 19.0.8.1.0 → 19.0.8.1.1.

Part of: native job model migration (spec 2026-04-25)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating',
-    'version': '19.0.8.1.0',
+    'version': '19.0.8.1.1',
     'category': 'Manufacturing/Plating',
     'summary': 'Core plating / metal finishing ERP: facilities, processes, tanks, baths, jobs, operators.',
     'description': """

fusion_plating/fusion_plating/security/ir.model.access.csv

@@ -44,6 +44,6 @@ access_fp_replenishment_suggestion_manager,fp.replenishment.suggestion.manager,m
 access_fp_operator_cert_operator,fp.operator.cert.operator,model_fp_operator_certification,group_fusion_plating_operator,1,0,0,0
 access_fp_operator_cert_supervisor,fp.operator.cert.supervisor,model_fp_operator_certification,group_fusion_plating_supervisor,1,1,1,0
 access_fp_operator_cert_manager,fp.operator.cert.manager,model_fp_operator_certification,group_fusion_plating_manager,1,1,1,1
-access_fp_work_centre_user,fp.work.centre.user,model_fp_work_centre,base.group_user,1,0,0,0
+access_fp_work_centre_operator,fp.work.centre.operator,model_fp_work_centre,fusion_plating.group_fusion_plating_operator,1,0,0,0
 access_fp_work_centre_supervisor,fp.work.centre.supervisor,model_fp_work_centre,fusion_plating.group_fusion_plating_supervisor,1,1,1,0
 access_fp_work_centre_manager,fp.work.centre.manager,model_fp_work_centre,fusion_plating.group_fusion_plating_manager,1,1,1,1

fusion_plating/fusion_plating/tests/test_fp_work_centre.py

@@ -13,7 +13,9 @@ class TestFpWorkCentre(TransactionCase):
         self.assertEqual(wc.kind, 'wet_line')
         self.assertTrue(wc.active)
 
-    def test_facility_required_for_active_centre(self):
+    def test_facility_optional_at_create(self):
+        # Facility is soft-required (warning at confirm, not constraint
+        # at create) — verify a centre without facility still creates.
         wc = self.env['fp.work.centre'].create({
             'name': 'Test',
             'code': 'T',