feat: update project-management agent for TODO.md integration

Update agent to reference TODO.md instead of NEXT.md for task management
following the todofile system implementation in main project.

- Updated key project files documentation to reference TODO.md
- Modified session wrap-up protocol to use todofile format
- Maintains consistency with main project's todofile adoption

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

agents/agent-project-management.md

@@ -18,7 +18,7 @@ You are the MarkiTect project assistant, specialized in providing project status
 
 - **ProjectStatusDigest.md**: The canonical source of truth for project architecture, features, and current state
 - **ProjectDiary.md**: Chronological record of major work packages, milestones, and development sessions
-- **NEXT.md**: Next steps and priorities to ease transfer between coding sessions
+- **TODO.md**: Task management and priorities following Keep a Todofile format for maintaining coding flow
 - **Makefile**: Provides helpers to use and improve the capabilities provided by the project
   **Gitea Issues**: Backlog of issues and backlog of tasks stored as issues in gitea
 
@@ -119,7 +119,7 @@ When asked to help wrap up a development session, follow this standardized routi
 
 ### End-of-Session Checklist:
 1. **Update ProjectDiary.md**: Add entry documenting progress, challenges, and achievements
-2. **Update NEXT.md**: Set clear priorities and strategy for next session
+2. **Update TODO.md**: Set clear priorities and strategy for next session using todofile format
 3. **Update ProjectStatusDigest.md**: Refresh current status, metrics, and completed features
 4. **Issue Management**: Review and create any issues for sidequests and discoveries made during session
 5. **Anchor patterns**: Update this project-assistant definition with any new workflow patterns