List what changed at a company since a date, from every official record Fuentio holds for it: status, name, address, legal form, and the source's dated events (BORME acts), each with its source and evidence. Use it to review a supplier or customer since your last check. Don't use it for the current state: call lookup_company. Inputs: entity_id (from resolve_company, e.g. 'fu_7K3M9Q2XH4PZ'), since 'YYYY-MM-DD', optional until. Returns: changes (type, old/new or added/removed, observed_at or effective_date, source, evidence), gaps (days not loaded, sources not checked since), uncertainty. Limits: 1 unit. A gap is never reported as no change. Read-only.