Type Alias: CompactionRetention

CompactionRetention = "conversation" | "discard"

Defined in: src/core/agent/window/types.ts:202

What becomes of the messages a fold removes from the window.

The commit log keeps them for as long as the PROCESS keeps them, and that is the whole of what 8.1 offered. A standing agent outlives its process, so "the folded turns are still in the commit log" stops being true the moment the run ends — and the summary sitting in the restored conversation went on claiming otherwise. Retention is the fix: the originals ride with the CONVERSATION, which is the thing that actually survives.

The trade is stated rather than hidden: compaction shrinks the wire, not the record. A stored session grows as it folds. That is the right way round — the model's context window is scarce and a session row is not.