Group Utility units into subsystem folders and require OFFSET provenance

Move Lexicon*, Text (TextTokens, TextEscapes, Base64), Math/RadialGrid, Hash (MD5, XxHash32) and Cipher (Rijndael, XorBytes) into Source/Utility subfolders; update includes, guards, compile.json and CMakeLists.txt. Backfill // OFFSET: above every standalone // FUNCTION: block (89 IDs, addresses from the symbol database) and make it mandatory in CODING_RULES.md and AGENTS.md. Remove the MatchLexicon cast chain.

Source/Utility/Text/FormatString.cpp

@@ -26,6 +26,7 @@ int StringFormat(char* buffer, std::size_t sizeInBytes, std::size_t count, const
 namespace {
   class ThreadSafeBuffer {
   public:
+    // OFFSET: 0x00733F00
     // FUNCTION: fn_07592
     ThreadSafeBuffer() {
       InitializeCriticalSection(&this->m_criticalSection);