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Ankush Gupta 4d9f3021c8 Include node_repl images in Guardian review evidence (#38454)
## What changed

- Preserve valid image content from completed `node_repl` Code Mode responses alongside text evidence for Guardian reviews.
- Enable multimodal evidence for models that require automatic `node_repl` review, or when both `guardian_enhanced_node_repl_transcripts` and `guardian_node_repl_transcript_images` are enabled.
- Bound retained and rendered evidence, deduplicate images already present in review history, and fall back to text-only evidence when the reviewer lacks image support or prompt capacity.
- Keep review evidence out of the parent turn input.

## Testing

- Cover feature gating, mixed text and image ordering, truncation and eviction, unsupported reviewers, prompt pressure, image detail normalization, and reused review sessions.

GitOrigin-RevId: a3e482402f7b3484401b231dadc662e6e3504fdf
2026-08-13 23:29:52 +00:00
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