Screenshot artifacts reverted to durable chat-scoped storage

What Changed

Durable screenshot artifacts materialized into chat-scoped storage, reversing the prior ephemeral-by-default posture for computer-use operations. Screenshots are now preserved within chat contexts.

Operator Implication

Operators must account for increased storage consumption as screenshots are now retained in chat context rather than ephemeral. This provides better audit trails and context preservation but changes memory/storage characteristics of deployments.

Receipt

• v1.19 release notes: 'Durable screenshot artifacts materialized into chat-scoped storage' under Computer Use & Desktop section.