Initial whetstone_RSA architecture and C++ scaffold

include/whetstone_rsa/probe_registry.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "whetstone_rsa/probe.h"
+
+#include <unordered_map>
+#include <vector>
+
+namespace whetstone::rsa {
+
+class ProbeRegistry {
+public:
+    void register_probe(ProbePtr probe);
+    [[nodiscard]] ProbePtr find(const std::string& probe_id) const;
+    [[nodiscard]] std::vector<ProbePtr> applicable_probes(const GateDefinition& gate_definition,
+                                                          const GateEvidence& evidence) const;
+    [[nodiscard]] std::vector<std::string> ids() const;
+
+private:
+    std::unordered_map<std::string, ProbePtr> probes_;
+};
+
+}  // namespace whetstone::rsa