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- Create domain/errors.py as canonical error hierarchy: DomainError, InvalidStateTransition, PermissionViolation, BusinessRuleViolation, EntityNotFoundError, DuplicateEntityError - InvalidOperationError now inherits from BusinessRuleViolation for semantic consistency - Convert domain/exceptions.py to backward-compatible re-export shim with legacy aliases (DomainException, InvalidTransitionError, AuthorizationError) - Update error_handler.py to import from domain/errors.py and map all new error types - Update main.py to register DomainError (new base) as the exception handler root