Initial whetstone_RSA architecture and C++ scaffold

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+project(whetstone_rsa LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+add_library(whetstone_rsa_core
+    src/diagnosis_engine.cpp
+    src/probe_registry.cpp
+    src/suitability_assessor.cpp
+    src/probes/confidence_threshold_probe.cpp
+)
+
+target_include_directories(whetstone_rsa_core
+    PUBLIC
+        ${CMAKE_CURRENT_SOURCE_DIR}/include
+)
+
+target_compile_features(whetstone_rsa_core PUBLIC cxx_std_20)
+
+if (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+    target_compile_options(whetstone_rsa_core PRIVATE -Wall -Wextra -Wpedantic)
+endif()
+
+add_executable(whetstone_rsa_demo
+    examples/diagnose_demo.cpp
+)
+
+target_link_libraries(whetstone_rsa_demo PRIVATE whetstone_rsa_core)