Preserve Guardian review evidence across compaction - #41879
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## Why Guardian reviews need the original conversation evidence even after the parent context has been compacted, while rollback must still remove evidence from reverted turns. ## What changed - Build synchronous and asynchronous Guardian transcripts from the retained review-history snapshot. - Use the shared Guardian transcript collector for consistent entry formatting, tool attribution, and per-entry truncation while preserving the existing transcript retention budgets. ## Testing - Add app-server coverage for retaining user and tool evidence after compaction and discarding it after rollback. - Extend transcript tests for standalone tool outputs, shell calls, attribution, truncation, and retention limits. GitOrigin-RevId: a18b1176f14a4d006c263aa82d4e593afee66bc3
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Preserve Guardian review evidence across compaction
Why
Guardian reviews need the original conversation evidence even after the parent context has been compacted, while rollback must still remove evidence from reverted turns.
What changed
Testing