fix(ci): add parallel test execution to release workflow

Add -n 2 flag to pytest commands in the release workflow test-matrix
job to enable parallel test execution. This matches the optimization
made to ci.yml and should significantly reduce the test runtime,
helping the release workflow avoid timeout issues.

The previous fix (fb324bc) removed the sentence-transformers install
step, but tests were still running sequentially which contributed
to timeouts on the resource-constrained Codeberg runners.

Signed-off-by: jgstern-agent <josh-agent@iterabloom.com>

Author: jgstern-agent

.github/workflows/release.yml

@@ -67,10 +67,10 @@ jobs:
         run: |
           if [ "$EMBEDDINGS_AVAILABLE" = "true" ]; then
             echo "Embeddings available - using standard coverage"
-            pytest --cov=src --cov-report=term-missing --cov-fail-under=100
+            pytest -n 2 --cov=src --cov-report=term-missing --cov-fail-under=100
           else
             echo "::warning::Embeddings unavailable - using reduced coverage config"
-            pytest --cov=src --cov-report=term-missing --cov-fail-under=100 \
+            pytest -n 2 --cov=src --cov-report=term-missing --cov-fail-under=100 \
               --cov-config=.coveragerc.no-embeddings
           fi