Refactored the grid filter panel system:
- Renamed "quick-filter panel" to "filter panel" throughout.
- Introduced IMgGridFilterPanelComponent interface for filter panel contract.
- Split MgTagBox (now behavior-free) and new MgGridFilterPanelTagBox for grid filter logic.
- Grid tracks filter panel components, synchronizes criteria, and exposes new filter panel methods.
- Filter panel always rendered (CSS-hidden when off) to prevent invisible filtering.
- Added right-aligned "Clear Filters" button for panel-owned filters.
- Updated docs, parameter tables, and glossary for new terminology and structure.
- Updated usages to new component; legacy grid class implements no-op interface.
- Documented edge cases and updated CSS for new layout.
Introduced a flexible quick-filter panel to the grid system via a new FilterPanel slot in MgGridBase. Added interface and implementation for filter panel visibility and toggle logic. Updated toolbar to show a Show/Hide Filters button when applicable. MgTagBox now applies per-field quick-filters using SetFieldQuickFilter. Removed redundant MgGridFilterPanelBase. Updated documentation and ADR 0004 to cover the new feature. Added CSS for consistent filter panel styling and demonstrated usage in GridPartner.razor. Legacy MgGridBase updated for compatibility.
Refactor docs: topic folders, TOON, XCUT, protocol sync
- Migrated all topic documentation into dedicated folders with canonical `README.md`, `ISSUES.md`, and `TODO.md` per topic (e.g., `LOGGING/`, `SIGNALR/`, `BINARY/`, `TOON/`).
- Added comprehensive TOON serializer documentation: design, format, options, attributes, inference, issues, and TODOs.
- Introduced `XCUT` folder for cross-cutting issues and TODOs, with canonical entries and topic cross-references.
- Updated all references and navigation to use new folder-based doc paths; fixed links and clarified doc structure.
- Enhanced AI agent protocol: enforce session skill preloading, `[LOADED_DOCS: ...]` short-name prefix, and mandatory `docs-check` skill for doc/code sync.
- Updated `.csproj` to include all `README.md` files for IDE visibility.
- Improved and clarified SignalR, grid, and project-level documentation.
- Minor code/test tweaks and doc content corrections for consistency.
Loretta