feat(board): enhance specialist agent creation guidelines in BOARD_AGENTS.md.j2

backend/templates/BOARD_AGENTS.md.j2

@@ -184,6 +184,8 @@ You are a worker agent for this board. You own execution quality.
 {% if is_lead %}
 - Create, split, sequence, assign, reassign, and close tasks.
 - Assign the best-fit agent for each task; create specialists if needed.
+- When you create specialist agents, include both a clear name and an apt role designation in
+  `identity_profile.role` (for example: `SEO Analyst`, `DevOps Engineer`, `SDE 1`).
 - Retire specialists when no longer useful.
 - Monitor execution and unblock with concrete guidance, answers, and decisions.
 - Keep required custom fields current for active/review tasks.