fix(ci): optimize release workflow to avoid timeout

Apply same optimizations from ci.yml to release.yml:

- Add pip cache to all jobs (test-matrix, security-audit, integration-tests, build-and-publish)
- Remove sentence-transformers install attempts (just check availability)
- Remove contingency reinstall step that was wasting time
- Simplify grammar build step comments

The release workflow was timing out because it tried to install
sentence-transformers (300s timeout x 4 Python versions = 20min wasted)
plus contingency reinstalls. ci.yml already fixed this by just checking
if sentence-transformers is available rather than trying to install it.

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

Author: jgstern-agent

.github/workflows/release.yml

@@ -41,37 +41,27 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
+          cache: 'pip'
 
       - name: Install dependencies
         run: |
           pip install --upgrade pip
           pip install -e .[dev]
 
-      - name: Build source-only grammars (while memory is fresh)
-        run: |
-          # Build grammars BEFORE trying sentence-transformers since
-          # torch/cuBLAS can fragment memory and cause OOM during builds
-          ./scripts/build-source-grammars
+      - name: Build source-only grammars
+        run: ./scripts/build-source-grammars
 
-      - name: Try installing sentence-transformers (optional)
+      - name: Check for sentence-transformers
         run: |
-          echo "Attempting to install sentence-transformers..."
-          if timeout 300 pip install sentence-transformers 2>&1; then
-            echo "sentence-transformers installed successfully"
+          # Don't try to install - just check if it's already available.
+          # Installing sentence-transformers on small runners often times out.
+          if python -c "import sentence_transformers" 2>/dev/null; then
+            echo "sentence-transformers available"
             echo "EMBEDDINGS_AVAILABLE=true" >> "$GITHUB_ENV"
           else
-            echo "::warning::sentence-transformers install failed (expected on small runners)"
+            echo "sentence-transformers not installed, embedding tests will be skipped"
             echo "EMBEDDINGS_AVAILABLE=false" >> "$GITHUB_ENV"
           fi
-        continue-on-error: true
-
-      - name: Contingency reinstall (if sentence-transformers failed)
-        if: always() && env.EMBEDDINGS_AVAILABLE != 'true'
-        run: |
-          echo "Reinstalling clean [dev] dependencies..."
-          pip cache purge 2>/dev/null || true
-          pip uninstall -y sentence-transformers torch transformers huggingface_hub safetensors 2>/dev/null || true
-          pip install -e .[dev] --force-reinstall
 
       - name: Run tests with coverage
         run: |
@@ -97,6 +87,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.11'
+          cache: 'pip'
 
       - name: Install dependencies
         run: |
@@ -141,24 +132,16 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.11'
+          cache: 'pip'
 
       - name: Install dependencies
         run: |
           pip install --upgrade pip
           pip install -e .[dev]
 
-      - name: Build source-only grammars (while memory is fresh)
+      - name: Build source-only grammars
         run: ./scripts/build-source-grammars
 
-      - name: Try installing sentence-transformers (optional)
-        run: |
-          if timeout 300 pip install sentence-transformers 2>&1; then
-            echo "sentence-transformers installed successfully"
-          else
-            echo "::warning::sentence-transformers install failed (expected on small runners)"
-          fi
-        continue-on-error: true
-
       - name: Install jq
         run: |
           sudo apt-get update && sudo apt-get install -y jq || true
@@ -180,6 +163,7 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: '3.11'
+          cache: 'pip'
 
       - name: Install build tools
         run: |