fix: #883
- Implement multi-agent teaming system
- Add agent/multi_agent_teaming.py with mission bus, roles, handoff
- Add docs/multi-agent-teaming.md with comprehensive documentation
Addresses issue #883: [M6-P4] Multi-Agent Teaming — mission bus, roles, cross-agent handoff
Features:
1. Mission bus (unified message stream)
2. Role-based permissions (lead, write, read, audit)
3. Cross-agent handoff system
4. Level 2/3 isolation options
Components:
- MissionBus: Unified message stream
- Agent roles: LEAD, WRITE, READ, AUDIT
- CrossAgentHandoff: Task handoff system
- IsolationManager: Mount namespace and Podman isolation
- MultiAgentTeaming: Main mission cell manager
Deliverables from issue:
- [x] Mission bus (unified message stream for all participants)
- [x] Role-based permissions: lead, write, read, audit
- [x] Cross-agent handoff (Agent A checkpoints, Agent B resumes)
- [x] Level 2 (mount namespace) and Level 3 (rootless Podman) isolation options
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