v0.1.16

Single-change follow-up to v0.1.15: LangfuseConfig.enabled=true now fails
fast at config load when the [langfuse] extra is not installed, closing
the silent-disable path where tracing was configured but never produced
traces. No behavior change for enabled=false or for users who have the
extra installed.

Fixed

• LangfuseConfig.enabled=true now fails fast when the langfuse package is not installed (#234, closes #233) — LangfuseConfig already rejects enabled=true without public_key / secret_key at config-load time via _require_keys_when_enabled. The parallel environment check was missing: a user who had all three fields set but didn't install the [langfuse] extra (e.g. after uv tool install --reinstall memtomem-stm dropped the extras) hit a silent except ImportError: pass branch in server.py, so the proxy started cleanly but produced no traces and surfaced no warning. A second @model_validator(mode="after") now probes importlib.util.find_spec("langfuse") whenever enabled=true and raises ValueError with an install hint (uv tool install --reinstall 'memtomem-stm[langfuse]' or pip install 'memtomem-stm[langfuse]'). Symmetric with the existing key-requirement validator — schema and environment are both checked at load time instead of one failing loud and the other failing silent. No behavior change for users with enabled=false (the new validator short-circuits before probing), or for users who already have the extra installed.

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PyPI: https://pypi.org/project/memtomem-stm/0.1.16/
Full changelog: https://github.com/memtomem/memtomem-stm/blob/main/CHANGELOG.md#0116--2026-04-22

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