[feat] Last-message-only turns: runner rebuilds history from records#5486

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ardaerzin wants to merge 6 commits into

fix/transcript-hygienefrom

feat/sessions-last-message-only

Commits on Jul 24, 2026

docs(sessions): design for last-message-only sends + server-side reconstruction
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feat(runner): flag-gated durable record persistence with drop tracking
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feat(api): structure-preserving truncation for oversized record bodies
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feat(runner): reconstruct ChatMessage history from the session record log
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feat(runner): rebuild turn history from records when the client sends minimal history
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feat(web): send only the trailing user message per agent turn when enabled
ardaerzin
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