Make CI parity failures concise and actionable

Author: OVVO-Financial

.github/workflows/native-backend-ci.yml

@@ -24,33 +24,38 @@ jobs:
 
       - name: Install build tools
         run: |
-          python -m pip install -U pip
+          python -m pip install -q -U pip
           # numpy pinned <2.5: the R parity cache keys hash test inputs generated via
           # multivariate_normal (LAPACK SVD). numpy 2.5.x bundles an OpenBLAS whose SVD
           # kernels differ on some runner CPUs, changing inputs bit-for-bit and causing
           # cache misses. Re-evaluate at the next full live-R cache regeneration.
-          python -m pip install build scikit-build-core nanobind pytest ruff mypy "numpy<2.5" scipy
-          python -m pip install hypothesis pytest-benchmark pytest-xdist
+          python -m pip install -q build scikit-build-core nanobind pytest ruff mypy "numpy<2.5" scipy
+          python -m pip install -q hypothesis pytest-benchmark pytest-xdist
 
       - name: Install package editable
-        run: python -m pip install -e .
+        run: python -m pip install -q -e .
 
       - name: Run native import smoke test
         run: python -c "import nns._nnscore as c; print(c.lpm(2.0, 0.0, [-2.0, -1.0, 0.5, 3.0]))"
 
       - name: Run invariants without Rscript
-        run: python -m pytest -q tests/invariants
+        run: |
+          set +e
+          python -m pytest -q --tb=short tests/invariants > invariant-results.txt 2>&1
+          status=$?
+          cat invariant-results.txt
+          exit $status
 
       - name: Run parity from committed R cache
-        run: NNS_R_CACHE_ONLY=1 python -m pytest -q tests/parity
+        run: NNS_R_CACHE_ONLY=1 python -m pytest -q --tb=short tests/parity
 
       - name: Run plotting color-fidelity tests
-        run: python -m pytest -q tests/plotting
+        run: python -m pytest -q --tb=short tests/plotting
 
       - name: Run vignette examples
         run: |
           if [ -f tests/docs/test_vignette_examples.py ]; then
-            python -m pytest -q tests/docs/test_vignette_examples.py
+            python -m pytest -q --tb=short tests/docs/test_vignette_examples.py
           else
             echo "No docs vignette test present; skipping."
           fi