- Added SIGNALR.md (transport) and SIGNALR_DATASOURCE.md (collection) as layered, comprehensive documentation; retired SIGNALR_ARCHITECTURE.md
- Updated all .md files and READMEs to reference new docs and clarify separation between transport and DataSource
- Clarified CRUD tag structure (5 independent tags), single-method tag-based dispatch, and JSON-in-Binary tech debt
- Added slot allocation and wire format clarifications to serialization docs
- Improved documentation layering, conventions, and critical warnings for future maintainers
