ci: use HeFFTe 2.4.1 and soften clang-tidy

Use HeFFTe v2.4.1 during CI configure and limit clang-tidy to
OpenPFC code. Make the job informative (non-blocking) to avoid
pipeline failures from third-party or minor issues.

- Set Heffte_FIND_VERSION=2.4.1
- Add header-filter and restrict source patterns
- continue-on-error for clang-tidy

Author: ahojukka5

.github/workflows/ci.yml

@@ -47,6 +47,7 @@ jobs:
   clang-tidy:
     name: Clang-Tidy Analysis
     runs-on: ubuntu-latest
+    continue-on-error: true  # Make non-blocking - informative only
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -68,16 +69,28 @@ jobs:
             nlohmann-json3-dev
 
       - name: Configure (Debug with compile_commands)
-        run: cmake -S . -B build-tidy -G Ninja -DCMAKE_BUILD_TYPE=Debug -DCMAKE_EXPORT_COMPILE_COMMANDS=ON
+        run: |
+          cmake -S . -B build-tidy -G Ninja \
+            -DCMAKE_BUILD_TYPE=Debug \
+            -DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
+            -DHeffte_FIND_VERSION=2.4.1
 
       - name: Run clang-tidy (run-clang-tidy-16 if available)
         run: |
           if command -v run-clang-tidy-16 >/dev/null 2>&1; then
-            run-clang-tidy-16 -p build-tidy -quiet || exit 1
+              # Exclude third-party code from analysis
+              run-clang-tidy-16 -p build-tidy -quiet \
+                -header-filter='include/openpfc/.*' \
+                'src/.*\.cpp$' \
+                'apps/.*\.cpp$' \
+                'tests/.*\.cpp$' || echo "⚠️  Clang-tidy found issues (non-blocking)"
           else
             echo "run-clang-tidy-16 not found; falling back to per-file analysis"
-            set -e
-            find src -name "*.cpp" -print0 | xargs -0 -n1 clang-tidy-16 -p build-tidy --quiet
+              find src apps tests -name "*.cpp" | while read -r file; do
+                clang-tidy-16 -p build-tidy --quiet \
+                  -header-filter='include/openpfc/.*' \
+                  "$file" || echo "⚠️  Issues in $file"
+              done
           fi
 
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