test(ci): rewrite test-gate section with JUnit output, coverage artifacts, stricter threshold

- Add pyproject.toml to register slow/perf marks (enables --strict-markers)
- Remove --no-header and -q so Python/pytest version appear in CI logs
- Add --junit-xml per Python version for GitHub test annotations
- Add --cov-report=xml per Python version for coverage tracking
- Raise --cov-fail-under from 43 to 48 (actual coverage is ~50%)
- Upload test results and coverage XML as artifacts on every run (pass or fail)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aeiwz

.github/workflows/python-publish.yml

@@ -56,10 +56,26 @@ jobs:
 
       - name: Run functional tests (excluding slow/perf)
         run: |
-          pytest -q --no-header \
+          pytest \
             -m "not slow and not perf" \
+            --junit-xml=test-results/py${{ matrix.python-version }}.xml \
             --cov=metbit \
-            --cov-fail-under=43
+            --cov-report=xml:coverage-py${{ matrix.python-version }}.xml \
+            --cov-fail-under=48
+
+      - name: Upload test results
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results-py${{ matrix.python-version }}
+          path: test-results/
+
+      - name: Upload coverage report
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-py${{ matrix.python-version }}
+          path: coverage-py${{ matrix.python-version }}.xml
 
   # ---------------------------------------------------------------------------
   # 2. Source distribution

pyproject.toml

@@ -0,0 +1,8 @@
+[tool.pytest.ini_options]
+minversion = "7.0"
+addopts = "--tb=short --strict-markers"
+testpaths = ["tests"]
+markers = [
+    "slow: tests that take more than a few seconds (deselect with '-m not slow')",
+    "perf: performance and throughput benchmarks (deselect with '-m not perf')",
+]