test(plating-sec): verify 8-role hierarchy + implied_ids chains

Group-structure tests for Phase 1 permissions overhaul. Covers:
- All 7 new res.groups records present (8th role "No" is implicit)
- Owner transitively implies base.group_system + every old group
- Manager forms the diamond (implies both Shop Manager and Sales Manager)
- Sales and Shop branches remain orthogonal at the leaf (Tech != Sales Rep)
- uid 1/2 auto-assigned to Owner
- Sequence numbers unique (renders dropdown predictably)
- New groups imply old for backward-compat (30-day rollback safety)
- Cross-module backward-compat chain works (e.g., Owner -> CGP DO)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating/tests/__init__.py

@@ -3,3 +3,4 @@ from . import test_fp_work_centre
 from . import test_fp_job_state_machine
 from . import test_fp_job_step_state_machine
 from . import test_simple_recipe_flatten
+from . import test_role_groups