Expanded and clarified grid documentation:
- Grids/README.md now details FruitBankGridBase<TEntity> usage, default settings, and legacy MgGridBase.
- Main README.md and ARCHITECTURE.md reference Grids/README.md for grid details.
- Subfolder table in Grids/README.md includes descriptive notes.
- CONVENTIONS.md: removed outdated layout key section, streamlined code reuse guidance.
- GLOSSARY.md links to canonical MgGrid docs and new grid base docs.
- copilot-instructions.md: clarified .md sync rules and documentation layering.
These changes ensure clear, layered, and non-redundant grid documentation.
Loretta
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