Compaction and summaries

A context_compaction records when original context is replaced by a shorter summary or structured digest.

Summary contract

A context_summary SHOULD include summary_id, summary_kind, content, source_item_refs, coverage, loss_notes, open_questions, freshness, validation, and refresh_policy.

Triggers

Initial triggers: manual, token_pressure, session_length, task_boundary, handoff, retention, privacy, provider_context_editing, and custom.

Fixed rule

A compaction is safe only if reviewers can tell what it replaced, what it preserved, what it lost, and when it should be refreshed.