feat: add Kimi K2.5 and K2.5 Free models to synthetic catalog

Add hf:moonshotai/Kimi-K2.5 and hf:moonshotai/Kimi-K2.5-free to the synthetic model catalog.

- Both models have 256k context window and 8192 max tokens
- Both support reasoning
- Available via dev.synthetic.new API

src/agents/synthetic-models.ts

@@ -107,6 +107,14 @@ export const SYNTHETIC_MODEL_CATALOG = [
     contextWindow: 256000,
     maxTokens: 8192,
   },
+  {
+    id: "hf:moonshotai/Kimi-K2.5-free",
+    name: "Kimi K2.5 Free",
+    reasoning: true,
+    input: ["text"],
+    contextWindow: 256000,
+    maxTokens: 8192,
+  },
   {
     id: "hf:openai/gpt-oss-120b",
     name: "GPT OSS 120B",