Add comparator API descriptor and libcomparatorCore scaffold.

Introduce ExportedComparatorTypeDesc/ComparatorLibDesc with inline
sanity checks, and add a core comparator shlib exporting three stub types.

Co-authored-by: Cursor <cursoragent@cursor.com>

comparatorLibs/core/CMakeLists.txt

@@ -0,0 +1,21 @@
+add_library(comparatorCore SHARED
+	comparatorCore.cpp
+)
+
+set_target_properties(comparatorCore PROPERTIES
+	VERSION ${PROJECT_VERSION}
+	SOVERSION ${PROJECT_VERSION_MAJOR}
+)
+
+target_include_directories(comparatorCore PUBLIC
+	${CMAKE_SOURCE_DIR}/include
+	${CMAKE_SOURCE_DIR}/smocore/include
+)
+
+target_link_libraries(comparatorCore PUBLIC
+	spinscale
+)
+
+install(TARGETS comparatorCore
+	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} NAMELINK_SKIP
+)