Integrate Refactor solver sources and dual MSVC CMake builds

include/fesa/core/ascii.h

@@ -2,6 +2,7 @@
 #define FESA_CORE_ASCII_H_
 
 #include <cstdint>
+#include <string>
 #include <string_view>
 
 #include "fesa/core/status.h"
@@ -12,6 +13,11 @@ namespace fesa {
 /// @return The lowercase ASCII byte, or the input byte when it is not A-Z.
 char AsciiLower(char value) noexcept;
 
+/// @brief Returns an uppercase ASCII copy without changing other source bytes.
+/// @note Embedded nulls and non-ASCII bytes are preserved without locale
+/// folding.
+std::string AsciiUppercase(std::string value);
+
 /// @brief Compares two byte strings with ASCII-only case folding.
 /// @return True when the strings have equal length and equal ASCII-folded
 /// bytes.

include/fesa/core/source_identity.h

@@ -24,6 +24,14 @@ struct SourceEntityId {
   std::string source_label_text;
 };
 
+/// @brief Compares all preserved source fields without canonicalizing spelling.
+inline bool SourceIdentityEquals(const SourceEntityId& left,
+                                const SourceEntityId& right) noexcept {
+  return left.instance_name == right.instance_name &&
+         left.source_label == right.source_label &&
+         left.source_label_text == right.source_label_text;
+}
+
 }  // namespace fesa
 
 #endif  // FESA_CORE_SOURCE_IDENTITY_H_

include/fesa/core/status.h

@@ -98,11 +98,11 @@ class Result {
   struct FailureTag {};
 
   /// @brief Constructs the successful value alternative.
-  Result(SuccessTag, T value)
+  Result(SuccessTag, T&& value)
       : value_{std::move(value)}, status_{Status::Ok()} {}
 
   /// @brief Constructs the failed status alternative.
-  Result(FailureTag, Status status)
+  Result(FailureTag, Status&& status)
       : value_{std::nullopt}, status_{std::move(status)} {}
 
   std::optional<T> value_;