[justgithubaccount]

What changed

• return 502 Bad Gateway for explicit and malformed LLM provider failures
• persist project history only after a successful completion, including the assistant reply
• keep the production container startup fully offline by invoking the installed uvicorn binary
• add regression and container-runtime checks to CI
• document the corrected API behavior

Verification

• uv run ruff check .
• uv run mypy app
• uv run pytest --cov=app --cov-report=term-missing -q — 22 passed
• docker build -t app-poly-gitops-fastapi:test .
• bash tests/test_container_runtime.sh app-poly-gitops-fastapi:test — /health passed with --network none

Independent exact-head review: approved for operator merge at 370a5a9f82e03a5ddc9b79d26b303a8cb1173044.