Match Qwen Unicode number token boundaries

docs/issue111-tokenizer/baseline.log

@@ -0,0 +1,9 @@
+
+running 2 tests
+test engine::tokenizer::issue111::issue111_ds4_families ... {"case":"ds4_control","family":"glm","cases":19,"plain_rendered_exact":true}
+{"case":"ds4_control","family":"deepseek","cases":19,"plain_rendered_exact":true}
+ok
+test engine::tokenizer::issue111::issue111_legacy_requests ... ok
+
+test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 533 filtered out; finished in 0.80s
+