Add GitHub Actions workflow for build validation

.github/workflows/build.yml

@@ -0,0 +1,44 @@
+name: Build
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup HEMTT
+        uses: arma-actions/hemtt@v1
+
+      - name: Run HEMTT check
+        run: |
+          # Run hemtt check and capture output
+          OUTPUT=$(hemtt check 2>&1) || true
+          echo "$OUTPUT"
+
+          # Filter out L-S29 (false positives for dynamically defined functions)
+          # and fail if any other warnings remain
+          WARNINGS=$(echo "$OUTPUT" | grep -E "warning\[" | grep -v "L-S29" || true)
+          if [ -n "$WARNINGS" ]; then
+            echo ""
+            echo "::error::Lint warnings found:"
+            echo "$WARNINGS"
+            exit 1
+          fi
+
+      - name: Run HEMTT build
+        run: hemtt build
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: ocap-build
+          path: .hemttout/build/
+          retention-days: 7

.hemtt/project.toml

@@ -15,3 +15,6 @@ command_case = false
 banned_commands = false
 undefined = false
 format_args = false
+# Optimization suggestions - not critical
+if_assign = false
+select_parse_number = false