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Budget retained images during remote compaction - #40280
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## Why Remote compaction's retained-message budget counted text but not images, so image-heavy history could retain more context than the budget represented. ## What changed - 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. ## Testing - 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
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Budget retained images during remote compaction
Why
Remote compaction's retained-message budget counted text but not images, so
image-heavy history could retain more context than the budget represented.
What changed
compaction_image_budgetfeature to charge retained imagesusing the existing image size estimate.
message, while preserving existing text, audio, metadata, and
client-authored developer-message behavior.
does not fit.
Testing
messages, and client-authored developer messages.
enabled, disabled, and left at its default.