feat(prd-6): verify workflow triggers and add assignee_trigger (#13)

prds/6-e2e-test-forgejo-triggers.md

@@ -24,7 +24,7 @@ Systematically exercise each untested scenario on the live Forgejo instance (git
 
 ## Milestones
 
-- [ ] **M1: Ensure workflow covers all trigger types**
+- [x] **M1: Ensure workflow covers all trigger types**
 
   - Review `.forgejo/workflows/claude.yml` to confirm all 5 trigger types are listed
   - Add any missing triggers to the workflow file