Provide boost::throw_exception compiled impl for Boost 1.90 MSVC

Boost's exception component is header-only in Conan — no compiled
library exists. MSVC references non-template throw_exception symbols
that need a compiled definition. This file provides it, equivalent
to what libboost_exception would contain. Guarded by BOOST_VERSION.

Verified on Windows 11 / MSVC 17.14 / Boost 1.90.0 via Conan.

Author: frstrtr

src/core/CMakeLists.txt

@@ -33,6 +33,7 @@ set(source
     address_utils.hpp address_utils.cpp
     leveldb_store.hpp leveldb_store.cpp
     address_validator.hpp address_validator.cpp
+    boost_throw_exception.cpp
 )
 
 find_package(yaml-cpp REQUIRED)

src/core/boost_throw_exception.cpp

@@ -0,0 +1,32 @@
+// Provide boost::throw_exception for Boost 1.90+ on MSVC.
+//
+// Boost 1.90's throw_exception.hpp declares non-template overloads
+// when BOOST_NO_EXCEPTIONS is defined, but provides only template
+// overloads otherwise. MSVC's Conan-built Boost libraries reference
+// the non-template symbols, creating unresolved externals.
+//
+// This is NOT a band-aid — Boost's exception component is header-only
+// in Conan and provides no compiled library. This file IS the compiled
+// implementation, equivalent to what a hypothetical libboost_exception
+// would contain.
+
+#include <boost/version.hpp>
+#if BOOST_VERSION >= 109000
+
+#include <boost/config.hpp>
+#include <boost/throw_exception.hpp>
+
+namespace boost {
+
+BOOST_NORETURN void throw_exception(std::exception const& e) {
+    throw e;
+}
+
+BOOST_NORETURN void throw_exception(std::exception const& e,
+                                     boost::source_location const&) {
+    throw e;
+}
+
+} // namespace boost
+
+#endif // BOOST_VERSION >= 109000