fix(sprint83b): title_conflict_check agent delegation bug

- title_conflict_check.yml: replace identity.md agent_prompt with explicit
  anti-delegation directive; remove rag section that injected book production context
- project_review.yml: add agent_name: atlas to title_conflict_check dispatch
  so task routes to Atlas instead of the chapter writer agent

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

templates/project_review.yml

@@ -61,6 +61,7 @@ steps:
       project_slug: "{project.slug}"
       task_type: "title_conflict_check"
       content: "{title_check_content}"
+      agent_name: "atlas"
 
   - type: tool
     action: enqueue_strategy