Resolve the TODO at docs/content/reference/controller-architecture.md line 66: "TODO: ... represent an input/output or 'consumes' relationship".

Why

The controller architecture diagram does not explain how resources are consumed vs reconciled. Without this context, the diagram is incomplete and readers cannot fully understand the architecture.

Acceptance Criteria

• Extend the Mermaid diagram legend or accompanying text to explain input/output and "consumes" relationships
• Clearly distinguish between reconcile relationships and consumption relationships
• Remove the TODO comment from the source

Technical Details

• File: docs/content/reference/controller-architecture.md line 66
• TODO text: "TODO: ... represent an input/output or 'consumes' relationship"
• Context: Mermaid architecture diagram legend