JoinIR/SSA/Stage-3: sync CURRENT_TASK and dev env

src/runtime/plugin_loader_unified.rs

@@ -422,7 +422,40 @@ pub fn get_global_plugin_host() -> Arc<RwLock<PluginHost>> {
 
 pub fn init_global_plugin_host(config_path: &str) -> BidResult<()> {
     let host = get_global_plugin_host();
-    host.write().unwrap().load_libraries(config_path)?;
-    host.read().unwrap().register_boxes()?;
+    {
+        let mut h = host.write().unwrap();
+        let disabled = std::env::var("NYASH_DISABLE_PLUGINS")
+            .ok()
+            .as_deref()
+            .map(|v| v == "1" || v.eq_ignore_ascii_case("true") || v.eq_ignore_ascii_case("on"))
+            .unwrap_or(false);
+        if disabled {
+            eprintln!("[plugin/init] plugins disabled by NYASH_DISABLE_PLUGINS=1");
+            return Err(BidError::PluginError);
+        }
+
+        if !std::path::Path::new(config_path).exists() {
+            eprintln!(
+                "[plugin/init] plugins disabled (config={}): config file not found",
+                config_path
+            );
+            return Err(BidError::PluginError);
+        }
+
+        h.load_libraries(config_path).map_err(|e| {
+            eprintln!(
+                "[plugin/init] load_libraries({}) failed: {}",
+                config_path, e
+            );
+            BidError::PluginError
+        })?;
+        h.register_boxes().map_err(|e| {
+            eprintln!(
+                "[plugin/init] register_boxes({}) failed: {}",
+                config_path, e
+            );
+            BidError::PluginError
+        })?;
+    }
     Ok(())
 }

src/runtime/plugin_loader_v2/enabled/loader/config.rs

@@ -7,8 +7,10 @@ pub(super) fn load_config(loader: &mut PluginLoaderV2, config_path: &str) -> Bid
         .unwrap_or_else(|_| config_path.to_string());
     loader.config_path = Some(canonical.clone());
     loader.config = Some(
-        crate::config::nyash_toml_v2::NyashConfigV2::from_file(&canonical)
-            .map_err(|_| BidError::PluginError)?,
+        crate::config::nyash_toml_v2::NyashConfigV2::from_file(&canonical).map_err(|e| {
+            eprintln!("[plugin/init] failed to parse {}: {}", canonical, e);
+            BidError::PluginError
+        })?,
     );
     if let Some(cfg) = loader.config.as_ref() {
         let mut labels: Vec<String> = Vec::new();

src/runtime/plugin_loader_v2/enabled/loader/library.rs

@@ -51,7 +51,15 @@ pub(super) fn load_plugin(
             lib_path.display()
         );
     }
-    let lib = unsafe { Library::new(&lib_path) }.map_err(|_| BidError::PluginError)?;
+    let lib = unsafe { Library::new(&lib_path) }.map_err(|e| {
+        eprintln!(
+            "[plugin/init] dlopen failed for {} ({}): {}",
+            lib_name,
+            lib_path.display(),
+            e
+        );
+        BidError::PluginError
+    })?;
     let lib_arc = Arc::new(lib);
 
     unsafe {