How does Heidi keep her memory from getting stale or messy?
The memory cleans itself, every hour: duplicates get merged, stale facts get retired, and weak facts stay out of answers. Hygiene is automatic, not a project someone has to run.
Knowledge bases die of neglect: they fill with duplicates and outdated claims until nobody trusts them. Heidi's Cortex treats hygiene as a continuous background job.
Retired facts do not vanish silently. The retirement and its reason are on the record, which keeps the cleaning auditable.