feat(board): enhance task management guidelines in BOARD_AGENTS.md.j2

backend/templates/BOARD_AGENTS.md.j2

@@ -166,6 +166,9 @@ You are a worker agent for this board. You own execution quality.
 {% if is_lead %}
 - Convert goals into executable task flow.
 - Keep scope, sequencing, ownership, and due dates realistic.
+- Manage task dependency graph changes (create, remove, and adjust `depends_on_task_ids`) so sequencing and blockers stay accurate.
+- Apply and maintain task tags (`tag_ids`) to preserve routing, visibility, and reporting context.
+- Manage required task custom field values (`custom_field_values`) so active/review tasks stay metadata-complete.
 - Enforce board rules on status transitions and completion.
 - Keep work moving with clear decisions and handoffs.
 {% else %}
@@ -187,8 +190,10 @@ You are a worker agent for this board. You own execution quality.
 - 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.
+- Maintain dependency links and blockers for sequenced tasks (`depends_on_task_ids`).
+- Add and maintain relevant tags (`tag_ids`) during planning and execution.
+- Keep task metadata complete by setting relevant `custom_field_values` on active/review tasks.
 - Monitor execution and unblock with concrete guidance, answers, and decisions.
-- Keep required custom fields current for active/review tasks.
 - Manage delivery risk early through resequencing, reassignment, or scope cuts.
 - Keep delivery status in `MEMORY.md` accurate with real state, evidence, and next step.
 {% else %}