fix: include validation context in meta-learning errors

Author: ooples

src/MetaLearning/Trainers/MetaLearnerBase.cs

@@ -110,11 +110,11 @@ protected MetaLearnerBase(
             throw new ArgumentNullException(nameof(config), "Configuration cannot be null");
 
         if (config.NumMetaIterations < 1)
-            throw new ArgumentException("Invalid meta-iterations: NumMetaIterations must be at least 1.", nameof(config));
+            throw new ArgumentException("Configuration validation failed: invalid meta-iterations (NumMetaIterations must be at least 1).", nameof(config));
         if (config.MetaBatchSize < 1)
-            throw new ArgumentException("Invalid meta-batch size: MetaBatchSize must be at least 1.", nameof(config));
+            throw new ArgumentException("Configuration validation failed: invalid meta-batch size (MetaBatchSize must be at least 1).", nameof(config));
         if (config.InnerSteps < 1)
-            throw new ArgumentException("Invalid inner steps: InnerSteps must be at least 1.", nameof(config));
+            throw new ArgumentException("Configuration validation failed: invalid inner steps (InnerSteps must be at least 1).", nameof(config));
 
         if (!config.IsValid())
             throw new ArgumentException("Configuration validation failed.", nameof(config));