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cc6cdf9297
fix(tracing): warn clearly when LangWatch is unavailable on Python 3.14 The official Docker images run Python 3.14, but the `langwatch` package caps its requires-python at <3.14, so it is excluded from the image. With LANGWATCH_API_KEY set, the tracer hit an ImportError and disabled itself with only a cryptic, per-run `logger.exception`, so users saw no traces and no actionable explanation (works on PyPI/desktop, which run Python 3.10-3.13). Emit a single, version-aware warning when the langwatch package is missing despite the API key being set, and document the Python 3.14 / Docker limitation in the LangWatch integration guide.