Switch embedded tokenizer to Tencent Hy3 120k ByteLevel BPE

hygate.h

@@ -71,9 +71,7 @@ char *build_completion_response(const char *id, long created, const char *model,
                                 tool_call_t *tc, int n_tc, int prompt_tokens);
 
 
-/* Token counting (embedded cl100k_base BPE tokenizer). Counts are
- * deterministic subword counts; the served model (Hunyuan) uses a
- * different tokenizer, so these are an approximation, not exact. */
+/* Token counting (embedded Tencent Hy3 120k ByteLevel BPE tokenizer). */
 int tok_count(const char *text, int len);
 int tok_count_str(const char *text);