Implement omo_task tool that allows main agents (oracle, frontend-ui-ux-engineer, etc.) to spawn explore or librarian as subagents.
- Add constants: ALLOWED_AGENTS, TASK_TOOL_DESCRIPTION_TEMPLATE
- Add types: AllowedAgentType, OmoTaskArgs, OmoTaskResult
- Implement createOmoTask function with session management
- Support both new session creation and existing session continuation
- Include proper error handling and logging
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