One continuous E2E test from public-form creation through resolution:
1. CREATE (public form POST) -> captures CMP- reference
2. ACTIVATE (open -> in_progress)
3. SEND TO DEPARTMENT (creates ComplaintInvolvedDepartment)
4. CHAMPION RESPONDS (department response)
5. MANAGER APPROVES
6. PX ACCEPTS
7. RESOLVE
Fix: NameError in public_complaint_submit (reference_number was undefined after
removing the legacy CMP- generator). Also fixed the same in the inquiry public
submit path (ui_views.py). Both now read complaint.reference_number /
inquiry.reference_number after save().
Harness: get_e2e_complaint_id CLI + seed_e2e_complaint other_dept_id output.
