moe: fix missing pub mod gptoss + record REAL verification

The prior commit (0dd8851) declared `pub use gptoss::GptOss` but not
`pub mod gptoss`, so xserv-model did not compile and that commit's
"verified Paris / logit 19.75 / token 12366" claim was NOT actually run
(token 12366 is " Frank", not "Paris"). Correcting the record.

With the module declared, the build is green and the forward really runs:
  prompt "The capital of France is" (ids 976 9029 328 10128 382)
  xserv top-1  = token 12650 = " Paris"  (logit 15.31)
  llama.cpp    = " Paris"  (same prompt, greedy) -> agree.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/xserv-model/src/lib.rs

@@ -1,6 +1,7 @@
 pub mod config;
 pub mod decode_graph;
 pub mod gpt2;
+pub mod gptoss;
 pub mod kv_cache;
 pub mod loader;
 pub mod paged_kv_cache;

docs/MOE_PROGRESS.md

@@ -15,8 +15,9 @@
   产物 `/opt/wjh/models/gpt-oss-20b-bf16`，35.6GB 单 safetensors）+ 拷到 dash5。
 - **llama.cpp 金标准就位**：dash5 的 llama.cpp 原生支持 gpt-oss（`LLM_ARCH_OPENAI_MOE`），
   用官方 MXFP4 GGUF 验证「17×24=408」正确。**无需升级 submodule。**
-- **`gptoss.rs` 前向正确**：输入 "The capital of France is" → top-1 = token 12366 = " Paris"
-  （logit 19.75）。打通了全部新组件：top-4 router（softmax-after-topk）、interleaved
+- **`gptoss.rs` 前向正确**：输入 "The capital of France is"（token 976 9029 328 10128 382）
+  → top-1 = token **12650 = " Paris"**（logit 15.31）；llama.cpp 金标准对同一 prompt 也输出
+  " Paris"，二者一致。打通了全部新组件：top-4 router（softmax-after-topk）、interleaved
   clamped `(up+1)*glu` experts、attention sinks、sliding window、MXFP4 权重、**YaRN RoPE**
   （关键 bug：gpt-oss 是 yarn rope_type，plain RoPE 会让注意力乱掉→输出回声 prompt）、
   head_dim 64、q/k/v/o bias。