[pull] main from danny-avila:main#103
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Add an opt-in `LangfuseConfig.deterministicTraceId`. When enabled, a run's root Langfuse trace id is derived from its runId as sha256(runId) -> first 32 hex chars (matching @langfuse/tracing's createTraceId) instead of a random id. This lets external systems attach scores or observations to the trace afterwards by regenerating the same id from the run/message id, with no trace lookup. Off by default; fully backwards compatible. Implemented via a custom IdGenerator on the Langfuse BasicTracerProvider that reads a per-run seed from an AsyncLocalStorage; Run.processStream wraps stream execution in runWithTraceIdSeed(runId) only when the flag is set. The title-generation trace is intentionally left untouched. Companion to danny-avila/LibreChat#13537 (surfacing message feedback as Langfuse scores). Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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