The HF token fix worked: pyannote got past the gate and failed one layer deeper,
instantiating the pipeline. Reproduced by running the real service with a GPU:
ModuleNotFoundError: No module named 'matplotlib'. pyannote's segmentation tasks
import matplotlib.pyplot at module load; it is not declared, and 'import
pyannote.audio' never reaches it, so the build's import check passed and the
venv shipped broken.

This is the fourth venv whose bare import check passed while the real load
failed. A <profile>.venv-<name>.check script now runs at build time in the
venv's own python and imports what the REAL load reaches — pipeline modules,
model classes — without a GPU or a token, which a build has neither of. The
pyannote check fails on the shipped image and passes with the fix; the XTTS
check passes as-is, so that venv is genuinely complete.

Also: every isolated-venv worker reported failures as the LAST FIVE LINES of the
subprocess tail. A Python traceback's last five lines are frame headers — the
exception is the final line, and cutting to five dropped it whenever the trace
was deep. Ten workers said where a process died and never why. Fixed in all of
them.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0182DhR1eFNPQyGmDrpHbedY