feat(llm): add xAI Build affinity and smarter prompt-cache compaction - #18
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- Add `SessionAffinity` and header injection for xAI Grok Build routing on main turns, parent-cached aux calls, and subagents. - Add adaptive request IDs and sticky `session_id`/`conv_id` handling, with fresh req IDs for continuation calls. - Extend prompt-cache observability with hit-rate metrics for Anthropic/OpenAI/OpenAI-compatible/Responses usage. - Update Anthropic cache marking to prefer transcript tip + previous-user placement and skip thinking blocks. - Add user-turn-based tool-output hard clear policy and hysteresis-based inline image compaction to reduce cache-bust churn. - Drop empty system/user rows during message conversion to preserve sticky-prefix stability. - Update prompt-caching docs and add related test coverage for the new behaviors.
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SessionAffinityand header injection for xAI Grok Build routing on main turns, parent-cached aux calls, and subagents. - Add adaptive request IDs and stickysession_id/conv_idhandling, with fresh req IDs for continuation calls. - Extend prompt-cache observability with hit-rate metrics for Anthropic/OpenAI/OpenAI-compatible/Responses usage. - Update Anthropic cache marking to prefer transcript tip + previous-user placement and skip thinking blocks. - Add user-turn-based tool-output hard clear policy and hysteresis-based inline image compaction to reduce cache-bust churn. - Drop empty system/user rows during message conversion to preserve sticky-prefix stability. - Update prompt-caching docs and add related test coverage for the new behaviors.