docs: improve task division strategy and add post-review prompt

- Add task division strategy to action-planning-agent: minimize count,
  share context, avoid overload
- Add post-review action to workflow review: prompt user to complete session

.claude/agents/action-planning-agent.md

@@ -780,6 +780,8 @@ Generate at `.workflow/active/{session_id}/TODO_LIST.md`:
 
 ### 2.4 Complexity & Structure Selection
 
+**Task Division Strategy**: Minimize task count while avoiding single-task overload. Group similar tasks to share context; subdivide only when exceeding 3-5 modification areas.
+
 Use `analysis_results.complexity` or task count to determine structure:
 
 **Single Module Mode**:

.claude/commands/workflow/review.md

@@ -312,3 +312,11 @@ Optional Review (when needed):
 - Regular development (tests are sufficient)
 - Simple bug fixes (test-fix-agent handles it)
 - Minor changes (update-memory-related is enough)
+
+## Post-Review Action
+
+After review completion, prompt user:
+```
+Review complete. Would you like to complete and archive this session?
+→ Run /workflow:session:complete to archive with lessons learned
+```