[sgl-router] Add Kimi-K3 rendering with SGLang parity (#40390)

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

experimental/sgl-router/tests/component/tokenizer/kimi.rs

@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: Copyright (c) 2026 The SGLang Authors
+// SPDX-License-Identifier: Apache-2.0
+
+use serde_json::{json, Value};
+use sgl_router::tokenizer::{adapter, chat_formatter::ChatFormatter};
+use sha2::{Digest, Sha256};
+
+#[path = "../../fixtures/kimi_k3.rs"]
+mod fixture;
+
+#[test]
+fn kimi_tokens_match_sglang() {
+    let fixture = fixture::tokenizer();
+    let path = fixture.path().join("tiktoken.model");
+    let path = path.to_str().unwrap();
+    let tokenizer = adapter::load(path).unwrap();
+    let formatter = ChatFormatter::load("served-alias", path).unwrap().unwrap();
+    let cases: Vec<Value> =
+        serde_json::from_str(include_str!("../../fixtures/kimi_k3/prompts.json")).unwrap();
+    for case in cases {
+        let mut request = case["request"].clone();
+        if let Some(repeat) = case["repeat"].as_u64() {
+            request["messages"][0]["content"] = request["messages"][0]["content"]
+                .as_str()
+                .unwrap()
+                .repeat(repeat as usize)
+                .into();
+        }
+        let ids = formatter.encode(&tokenizer, &request).unwrap();
+        let mut hash = Sha256::new();
+        for id in &ids {
+            hash.update(id.to_le_bytes());
+        }
+        assert_eq!(json!(ids.len()), case["token_count"], "{}", case["name"]);
+        assert_eq!(
+            format!("{:x}", hash.finalize()),
+            case["sha256"],
+            "{}",
+            case["name"]
+        );
+    }
+    let request = json!({"messages":[{"role":"user","content":"hi"}], "chat_template_kwargs":{"thinking_effort":null}});
+    assert!(formatter.encode(&tokenizer, &request).is_err());
+}

experimental/sgl-router/tests/component/tokenizer/mod.rs

@@ -1,5 +1,6 @@
 // SPDX-FileCopyrightText: Copyright (c) 2026 The SGLang Authors
 // SPDX-License-Identifier: Apache-2.0
 
+mod kimi;
 mod parity;
 mod render_parity;