Context

Enable multiple agents to work concurrently on independent subtasks. This is essential for performance — when a task is decomposed into parallel subtasks, the system should execute them simultaneously rather than sequentially.

Acceptance Criteria

• Concurrent agent execution using `asyncio.gather` or equivalent
• Shared resource locking to prevent conflicts (e.g., two agents writing to same file)
• Coordination points (wait for all parallel subtasks before proceeding)
• Configurable max concurrent agents (to control resource usage)
• Progress tracking for parallel execution groups
• Error isolation — one agent's failure does not crash other concurrent agents
• Graceful handling of partial failures (some succeed, some fail)
• Comprehensive unit tests (>80% coverage)

Dependencies

• Depends on message bus (Evaluate and implement message bus (asyncio queues vs external broker) #8)
• Depends on company config/templates (Define default configurations and company template schema #60) ✅ closed

Design Spec Reference

• Section 6 — Task Workflow
• Section 5.1 — Communication Patterns