feat(ml): add KAN architecture + TLOB/KAN trainable/hyperopt adapters

Phase 2-3 of ensemble expansion:
- KAN (Kolmogorov-Arnold Network): B-spline basis, layer, network, trainable adapter
- TLOB UnifiedTrainable adapter with 3D input support (batch, seq, features)
- Hyperopt adapters for both KAN and TLOB (ParameterSpace + metrics)
- ModelType::KAN variant registered in common, coordinator, lib.rs
- 44 new tests, all passing, zero warnings

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

common/src/model_types.rs

@@ -42,6 +42,8 @@ pub enum ModelType {
     TGNN,
     /// Ensemble of multiple models
     Ensemble,
+    /// Kolmogorov-Arnold Network
+    KAN,
 }
 
 impl ModelType {
@@ -60,6 +62,7 @@ impl ModelType {
             Self::PPO => "ppo",
             Self::Transformer => "transformer",
             Self::Ensemble => "ensemble",
+            Self::KAN => "kan",
         }
     }
 
@@ -76,6 +79,7 @@ impl ModelType {
             Self::DistilledMicroNet => "distilled",
             Self::Transformer => "transformer",
             Self::Ensemble => "ensemble",
+            Self::KAN => "kan",
         }
     }
 
@@ -92,6 +96,7 @@ impl ModelType {
             Self::TGGN | Self::TGNN => "tggn",
             Self::DistilledMicroNet => "distilled",
             Self::Transformer => "transformer",
+            Self::KAN => "kan",
         }
     }
 
@@ -110,6 +115,7 @@ impl ModelType {
             Self::TLOB => "TLOB",
             Self::Transformer => "TRANSFORMER",
             Self::Ensemble => "ENSEMBLE",
+            Self::KAN => "KAN",
         }
     }
 
@@ -134,6 +140,7 @@ impl ModelType {
             "ppo" => Some(Self::PPO),
             "transformer" => Some(Self::Transformer),
             "ensemble" => Some(Self::Ensemble),
+            "kan" => Some(Self::KAN),
             _ => None,
         }
     }