docs: clarify Fun-ASR-Nano vLLM precision boundary

docs/vllm_guide.md

@@ -872,6 +872,13 @@ Streaming: `serve_realtime_ws.RealtimeASRSession`
 **Q: Slow first startup?**
 vLLM initialization takes 60–90 s (KV Cache + CUDA Graph warmup). Subsequent inferences are instant.
 
+**Q: What happens when Fun-ASR-Nano vLLM uses `dtype="fp16"`?**
+The audio frontend and adaptor remain float16, but FunASR runs the Qwen3 decoder
+in bfloat16 because vLLM float16 decoding can produce degraded repeated output.
+This is automatic and keeps the two-byte decoder weight footprint. On hardware
+without BF16 support, use `dtype="fp32"`; the vLLM path does not claim an
+end-to-end FP16 decoder mode.
+
 **Q: vLLM returns repeated punctuation such as `!!!!!!!!` but PyTorch/HF generate is normal. What should I check?**
 This usually means the audio frontend and checkpoint can work, but the vLLM
 prompt-embedding path or decoding parameters differ from the upstream runner.

docs/vllm_guide_zh.md

@@ -866,6 +866,12 @@ RTFx 102 → 46。CER 不变。默认关闭。
 **Q: 首次慢？**
 vLLM 初始化 60-90s，之后即时。
 
+**Q: Fun-ASR-Nano vLLM 使用 `dtype="fp16"` 时实际会怎样？**
+音频 frontend 与 adaptor 仍使用 FP16，但 FunASR 会让 Qwen3 decoder 使用 BF16，
+因为 vLLM 的 FP16 decoder 可能产生退化的重复输出。该行为自动生效，decoder 权重
+仍是两字节精度；不支持 BF16 的硬件请使用 `dtype="fp32"`。vLLM 路径不宣称支持
+端到端 FP16 decoder。
+
 **Q: vLLM 输出连续标点（例如 `!!!!!!!!`），但 PyTorch/HF generate 正常，应该先查什么？**
 这通常说明音频 frontend 和 checkpoint 本身能工作，但 vLLM prompt-embedding
 路径或解码参数和 upstream runner 不一致。改模型前先检查这些项：

tests/test_docs_funasr_install_commands.py

@@ -341,8 +341,8 @@ def test_top_level_readmes_surface_current_release_and_edge_runtime():
     }
 
     for name, text in readmes.items():
-        assert 'python -m pip install -U "funasr==1.4.12"' in text, name
-        assert "https://github.com/modelscope/FunASR/releases/tag/v1.4.12" in text, name
+        assert 'python -m pip install -U "funasr==1.4.13"' in text, name
+        assert "https://github.com/modelscope/FunASR/releases/tag/v1.4.13" in text, name
         assert "runtime-llamacpp-v0.2.6" in text, name
 
     assert "https://www.funasr.com/en/deploy/llama-cpp.html" in readmes["README.md"]