LLM provider SDKs are imported by services/corporate_memory and
services/verification_detector — both production code paths. Listing
them only in [project.optional-dependencies].dev caused the scheduler
container to boot-loop with ModuleNotFoundError on default
`docker compose up` deploys, because the Dockerfile installs core
deps only (`uv pip install --system --no-cache .`).
Adds tests/test_packaging.py to lock the contract: anthropic + openai
must live in [project].dependencies, not in dev extras.
