Preserve audio across history and tool outputs - #34385
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## Why Audio attachments could be dropped from tool outputs and reconstructed thread history, while inline base64 payload size could overstate their model context cost. ## What changed - Preserve remote and local audio attachments in legacy user-message events and thread history. - Keep audio from function and custom tool outputs when the model supports it and the output fits the truncation budget; otherwise replace it with an omission marker. - Estimate inline audio cost from its duration, with a serialized-size fallback for malformed or unsupported data URLs, so compaction and truncation use model-visible cost instead of raw base64 size. - Replace audio in messages and tool outputs with an explanatory placeholder for models without audio input support. ## Testing Add coverage for history round trips, dynamic tool responses, modality filtering, duration-based context estimates, output-budget truncation, and remote compaction. GitOrigin-RevId: 5ed4628850a668f8383b7cd73db71b144cc02cd1
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Preserve audio across history and tool outputs
Why
Audio attachments could be dropped from tool outputs and reconstructed thread history, while inline base64 payload size could overstate their model context cost.
What changed
Testing
Add coverage for history round trips, dynamic tool responses, modality filtering, duration-based context estimates, output-budget truncation, and remote compaction.