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ashwinnathan-openai b7d9ed2720 Budget retained images during remote compaction (#40280)
Remote compaction's retained-message budget counted text but not images, so
image-heavy history could retain more context than the budget represented.

- Add the opt-in `compaction_image_budget` feature to charge retained images
  using the existing image size estimate.
- Keep images and their adjacent labels atomic when truncating a boundary
  message, while preserving existing text, audio, metadata, and
  client-authored developer-message behavior.
- Stop backfilling older messages when an image at the truncation boundary
  does not fit.

- Add unit coverage for image boundaries, annotations, audio, text-only
  messages, and client-authored developer messages.
- Add an integration test covering repeated remote compaction with the feature
  enabled, disabled, and left at its default.

GitOrigin-RevId: 88868bbd09d2858939dbae3f8402e1f497b4e3c6
2026-08-23 15:41:49 -07:00
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