feat: add Unity color and check target

Enable UNITY_OUTPUT_COLOR and UNITY_INCLUDE_PRINT_FORMATTED via
compile definitions on the unity target so colors propagate to all
test suites automatically.

Add a 'check' custom target that builds all suites and runs CTest
with --output-on-failure and USES_TERMINAL, keeping ANSI colors
alive through Ninja's buffering.

tests/CMakeLists.txt

@@ -28,12 +28,15 @@ function(cmock_generate_mock target header)
     target_include_directories("${target}" PRIVATE "${MOCK_GEN_DIR}" "${header_dir}")
 endfunction()
 
+set(TEST_TARGETS "")
+
 # str tests — pure functions, no mock needed
 add_executable(test_str test_str.c)
 target_include_directories(test_str PRIVATE "${CMAKE_SOURCE_DIR}")
 target_link_libraries(test_str PRIVATE ctdd_str Unity::Unity)
 target_compile_features(test_str PRIVATE c_std_23)
 add_test(NAME test_str COMMAND test_str)
+list(APPEND TEST_TARGETS test_str)
 
 # report tests — mocks logger.h so log_info calls are intercepted
 add_executable(test_report test_report.c)
@@ -42,6 +45,7 @@ target_link_libraries(test_report PRIVATE ctdd_report Unity::Unity CMock::CMock)
 target_compile_features(test_report PRIVATE c_std_23)
 cmock_generate_mock(test_report "${CMAKE_SOURCE_DIR}/ctdd/logger.h")
 add_test(NAME test_report COMMAND test_report)
+list(APPEND TEST_TARGETS test_report)
 
 # logger tests — mocks log_write.h so output calls are intercepted
 add_executable(test_logger test_logger.c)
@@ -50,3 +54,16 @@ target_link_libraries(test_logger PRIVATE ctdd_logger Unity::Unity CMock::CMock)
 target_compile_features(test_logger PRIVATE c_std_23)
 cmock_generate_mock(test_logger "${CMAKE_SOURCE_DIR}/ctdd/log_write.h")
 add_test(NAME test_logger COMMAND test_logger)
+list(APPEND TEST_TARGETS test_logger)
+
+# 'check' builds all suites and runs CTest with full Unity output.
+# USES_TERMINAL keeps ANSI colors alive through Ninja's output buffering.
+add_custom_target(check
+    COMMAND ${CMAKE_CTEST_COMMAND}
+            --test-dir "${CMAKE_BINARY_DIR}"
+            --output-on-failure
+            --progress
+    WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+    USES_TERMINAL
+    DEPENDS ${TEST_TARGETS}
+)