Add a fallback phase before automatic context rollover - #33255
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## Why Token-budget sessions need a final opportunity to preserve important state before the current context is compacted. ## What changed - When `auto_compact_fallback_prompt` is configured, reserve `auto_compact_fallback_buffer_tokens` beyond the base auto-compaction limit. - At the base limit, inject the fallback prompt once as a developer message while keeping the normal tool surface available. Continue reporting zero base-window tokens during this reserve. - Roll over when the reserve or full model context is exhausted, and skip the fallback when a new context was already requested. ## Testing Added coverage for using the fallback reserve, rolling over after it is exhausted, and bypassing the fallback for an explicit `new_context` request. GitOrigin-RevId: 32983ecadc5cb4927e15ecd7b1e896cb52a9ad3b
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Add a fallback phase before automatic context rollover
Why
Token-budget sessions need a final opportunity to preserve important state before the current context is compacted.
What changed
auto_compact_fallback_promptis configured, reserveauto_compact_fallback_buffer_tokensbeyond the base auto-compaction limit.Testing
Added coverage for using the fallback reserve, rolling over after it is exhausted, and bypassing the fallback for an explicit
new_contextrequest.