Public API for starting collaborative workflow editing sessions.

This module serves as the main entry point for collaborative editing, coordinating the creation and management of document and session processes for workflow collaboration. It manages the lifecycle of SharedDoc processes and ensures proper process discovery through :pg process groups and the collaboration Registry.

Key responsibilities:

• Starting collaborative editing sessions for users and workflows
• Coordinating DocumentSupervisor creation when needed
• Managing SharedDoc discovery via :pg process groups
• Delegating process lookup operations to the Registry