1. Hardened all demo models to set non-string ID fields to None, ensuring full Vision Standard compliance.\n2. Added status_id_random to common field schema.\n3. Verified account_id availability in exhibit tracking.\n4. Added comprehensive E2E parity test suite for demo objects.\n5. Fixed NameError by importing root_validator.
Standardized Badge, Exhibit, and Tracking models to ID Vision standards. Included account_id support for exhibit tracking and removed legacy validators to ensure stable CRUD operations for the Tuesday demo.