Use case catalogue

This section is under active drafting. The completed content lives in the Software Design Documentation v1.1 and will be migrated here as part of the documentation site implementation phase.

The structure of this section will follow the same conventions used throughout the documentation:

• A brief summary establishing what this section covers
• Structured tables, diagrams, or schemas as appropriate
• Cross-references to other sections via the sidebar
• A short closing note on review cadence or next steps