Remove 'mfc run' test from CI and clarify Homebrew limitations

The Homebrew formula installs pre-built binaries only, not the full source tree.
The 'mfc run' command requires CMakeLists.txt and source files to build cases.

Changes:
- Remove 'mfc run' test from CI (not applicable for binary-only install)
- Update formula caveats to explain this limitation
- Document that users should clone the repo for development workflows
- CI now only tests binary installation and 'mfc --help' functionality

Author: sbryngelson

.github/workflows/homebrew.yml

@@ -144,16 +144,10 @@ jobs:
           
           echo "=== All tests passed! ==="
       
-      - name: Run MFC test case
-        run: |
-          echo "Running a simple test case (1D Sod shock tube)..."
-          TESTDIR=$(mktemp -d)
-          cp $(brew --prefix mfc)/examples/1D_sodshocktube/case.py "$TESTDIR/"
-          
-          echo "Running with $(sysctl -n hw.ncpu) processors..."
-          mfc run "$TESTDIR/case.py" -j $(sysctl -n hw.ncpu)
-          
-          echo "Test case completed successfully!"
+      # Note: The 'mfc run' command requires the full MFC source tree to build/run cases.
+      # The Homebrew formula only installs pre-built binaries, not the development source.
+      # Users who need 'mfc run' should clone the MFC repository and use mfc.sh there.
+      # The pre-built binaries (pre_process, simulation, post_process) can be used directly.
 
       - name: Uninstall and cleanup
         if: always()

packaging/homebrew/mfc.rb

@@ -111,13 +111,19 @@ def caveats
     <<~EOS
       MFC has been installed successfully!
 
-      To use MFC:
-        mfc --help
+      Pre-built binaries are available:
+        pre_process, simulation, post_process
 
       Examples are available in:
         #{prefix}/examples
 
-      Note: Cantera 3.1.0 is pre-installed in the MFC virtual environment.
+      Note: The 'mfc run' command requires the full MFC source tree.
+      For development workflows, clone the repository and use mfc.sh:
+        git clone https://github.com/MFlowCode/MFC.git
+        cd MFC
+        ./mfc.sh run <case.py>
+
+      Cantera 3.1.0 is pre-installed in the MFC virtual environment.
     EOS
   end