Add GLM 5.2 Metal execution

src/engine.rs

@@ -372,21 +372,27 @@ pub(crate) struct CompactionOutput {
 #[cfg(target_os = "macos")]
 impl Generator {
     pub(crate) fn open(settings: &EngineSettings, metrics: Arc<Metrics>) -> Result<Self, String> {
-        if settings.model == ModelChoice::Glm52 {
-            return Err("GLM 5.2 generation is not initialized by the DeepSeek executor".into());
+        if settings.speculative.glm_mtp {
+            return Err(
+                "GLM MTP requires the shared speculative verifier, which is not enabled".into(),
+            );
         }
-        if settings.speculative.dspark || settings.ssd.enabled || settings.steering.file.is_some() {
+        if settings.speculative.dspark
+            || (settings.ssd.enabled && settings.model != ModelChoice::Glm52)
+            || settings.steering.file.is_some()
+        {
             return Err(
                 "DSpark, SSD streaming, and steering are not yet available in the Rust executor"
                     .into(),
             );
         }
         let model = Model::open(settings)?;
-        let executor = metal::Executor::open(
+        let executor = metal::Executor::open_configured(
             model,
             settings.context_tokens.max(1) as u32,
             settings.execution.quality,
             settings.execution.prefill_chunk,
+            settings.ssd,
         )?;
         Ok(Self {
             executor,