Generate an AGM orchestration node for a code review and merge automation system.

The orchestration should coordinate the following agents:
1. Static analysis agent (runs linters, type checkers)
2. Test runner agent (runs unit and integration tests)
3. Security scanner agent (checks for vulnerabilities)
4. Review assignment agent (assigns human reviewers)
5. Merge agent (merges after approvals)

Include appropriate parallel_groups where steps can run concurrently.
Set status to "pending".
