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## Why Agent messages that arrive after a model request starts must survive compaction until a normal inference request includes them. Compactor output alone does not establish that those messages were delivered. ## What changed - Persist history sequences and sampling checkpoints in harness metadata, capturing the input prefix for each normal inference request. - Retain pending agent messages within existing size budgets during local and remote compaction, placing the summary before pending messages and subsequent caller input. - Preserve sampling progress across history replacement and resume, and drain queued mail after interrupted sampling even when compaction leaves context above the token limit. ## Testing Add regression coverage for request-boundary sampling checkpoints, pending messages across local compaction and repeated remote compaction with resume, and injected messages that interrupt sampling before mid-turn compaction. GitOrigin-RevId: 26c04ab96b5a1c3cc1d6625ccc74a0f00201d14c