Apply Qwen NFC normalization before token splitting

docs/issue116-nfc/verification.json

@@ -0,0 +1,14 @@
+{
+  "base_commit": "5129c450ee6232f6752660c42bc9bdec39bff0ff",
+  "binary_sha256": "eb1a190a1c13f5cacfffbffd4edf9d625595cf7df07092a4b522f07718a4b8ce",
+  "date": "2026-10-04",
+  "platform": "Apple M5 Max 128 GiB",
+  "reference": "9882703f3105363ddc37eca9f97aa09a1d387112",
+  "normalizer_crate": "unicode-normalization-alignments 0.1.12",
+  "files": {
+    "Cargo.toml": "717e05ec41ed88d5be75e533be4c72f619e0d8c1bc83e92277cd53f78825ebb6",
+    "Cargo.lock": "49e8503559b1dbf69366684f601d4d62774f5300910583d4618ca4ed447009e7",
+    "src/engine.rs": "1ac05a99bb7f5a0902c60119569f99c62b5ae44f3e9434d033fadaf09c5a0cd0",
+    "src/engine/tokenizer.rs": "b8d8e9a561c72c28c383824abad9b87c15cc7c4455b6ac71ecec948abc785ba5"
+  }
+}