Fix CI test project to demonstrate correct usage order

The integration test was calling project() before setting up cpp-library and
enabling dependency tracking, which is incorrect and would fail for any library
with actual dependencies.

Corrected order:
1. cmake_minimum_required(VERSION 3.24) - updated from 3.20
2. include CPM.cmake
3. CPMAddPackage(cpp-library)
4. include cpp-library.cmake
5. cpp_library_enable_dependency_tracking()
6. project() - now called AFTER tracking enabled
7. cpp_library_setup()

This matches the documented usage pattern and ensures the test demonstrates
best practices for users following the example.

Author: sean-parent

.github/workflows/ci.yml

@@ -38,13 +38,21 @@ jobs:
           
           # Create CMakeLists.txt that uses cpp-library
           cat > CMakeLists.txt << 'EOF'
-          cmake_minimum_required(VERSION 3.20)
-          project(mylib VERSION 1.0.0)
+          cmake_minimum_required(VERSION 3.24)
           
+          # Setup CPM before project()
           include(../cmake/CPM.cmake)
+          
+          # Fetch cpp-library before project()
           CPMAddPackage(NAME cpp-library SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/..)
           include(${cpp-library_SOURCE_DIR}/cpp-library.cmake)
           
+          # Enable dependency tracking before project()
+          cpp_library_enable_dependency_tracking()
+          
+          # Now call project()
+          project(mylib VERSION 1.0.0)
+          
           # Create a simple test library
           cpp_library_setup(
               DESCRIPTION "Test library for cpp-library"