ci: add lint + unit test workflow#3
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Runs on push to main and on every PR. Installs ruff, pytest, and the CPU-only torch + numpy + matplotlib + tqdm subset needed by the test path (no training-time deps). Then runs `ruff check .` and `pytest -q tests/`. CPU torch from the pytorch download index keeps install time and disk under a minute (vs the 800 MB CUDA wheel pip would pick otherwise). Cache is keyed on pip so subsequent runs reuse the wheels.
The previous version pinned the entire `pip install` to the pytorch CPU index via `--index-url`, which made pip refuse `matplotlib` (it does not publish there). Fix: install only `torch` via that index, then `numpy matplotlib tqdm` via the default PyPI in a second command.
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Objective
Wire ruff + pytest into GitHub Actions so every push and PR gets a green check (or a red one if something regresses).
Changes
.github/workflows/ci.yml: single job,ubuntu-latest, 15-minute timeout.pipcache.ruff,pytest, and the CPU-onlytorch,numpy,matplotlib,tqdmsubset needed by the test path (the full deps fromrequirements.txtare not required to run the test suite; onlytrain.pyneeds them).ruff check .thenpytest -q tests/.Validation
python -m ruff check .locally: clean.python -m pytest -q tests/locally: 18 tests pass.Risk
low. Pure additive workflow file under.github/workflows/. No source modification. If the workflow has a YAML problem, GitHub will refuse to schedule it; no impact onmain.Out of scope
main).Tracked item:
gridworld-world-modelCI workflow.