When chats close due to resource limits, all invested context is lost. Users must re-upload files and start from scratch—wasting time and compute.

Proposal: Let users selectively pull context from older chats into active conversations: "Lumo, check our chat from last week for what we found about XY." -> the desired feature is similar to "websearch" - just scoping the own (internal) activities.

Optional: User tagging of important chats for quicker discovery.

Why it fits: Same privacy model, just extended. Decryption stays client-side, metadata stays user-controlled and encrypted. No server-side indexing.

Impact: Better session continuity, no redundant uploads, preserves invested work.