- Moved legacy/redundant tests to tests/archive/.
- Relocated root-level debug scripts to tests/integration/.
- Updated tests/README.md with final organized inventory.
- Cleaned up root directory from one-off reproduction scripts.
- Introduced WS_Message_V3 standardized Pydantic model and WS_Manager_V3.
- Implemented /v3/ws/ endpoint with granular Redis routing to solve "noisy neighbor" scaling issues.
- Added presence tracking using Redis Sets for group coordination.
- Comprehensive test suite added (unit and integration) covering models, manager, and routing logic.
- Documentation: Created V3 Frontend WebSocket Guide and Project design spec.
- Updated main Frontend API guide and tests README with new standards.