Add auto-compaction fallback token-budget settings - #33243
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## What changed - Add `auto_compact_fallback_prompt` and `auto_compact_fallback_buffer_tokens` to `features.token_budget` and the generated configuration schema. - Trim empty fallback prompts, limit prompts to 2,000 bytes, require a buffer when a prompt is configured, and reject non-positive buffer values. - Preserve the new settings when locking resolved session configuration. ## Testing - Cover config resolution and validation for overlong prompts, missing buffers, and non-positive buffers. - Extend the configuration-lock test to cover both settings. GitOrigin-RevId: 6463f963ba1dbd633d76601b8344360a8c85cf8b
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Add auto-compaction fallback token-budget settings
What changed
auto_compact_fallback_promptandauto_compact_fallback_buffer_tokenstofeatures.token_budgetand thegenerated configuration schema.
when a prompt is configured, and reject non-positive buffer values.
Testing
buffers, and non-positive buffers.