rka-oai 768330dd6c Add a fallback phase before automatic context rollover (#33255)
## 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
2026-07-15 05:45:43 +00:00
2026-04-24 17:49:29 -07:00
2025-04-16 12:56:08 -04:00
2025-04-16 12:56:08 -04:00
2026-04-24 17:49:29 -07:00

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