Enhance the JSDoc and class documentation for the core Grid classes to ensure they are fully indexable and intent-driven for the Knowledge Base.

Target Classes:

• Neo.grid.Container
• Neo.grid.Body
• Neo.grid.Row

Requirements:

• Add @summary tags to all classes.
• Explain the intent and architecture (e.g., Row Pooling, VDOM updates) in the class descriptions.
• Document key methods involved in the rendering lifecycle.
• Ensure cross-linking between classes using @see.