fix: remove unused struct fields to pass golangci-lint unused check

Author: Patel230

internal/filter/layers_37_80.go

@@ -39,15 +39,15 @@ type MultiLangAST struct{ parsers map[string]interface{} }
 
 func NewMultiLangAST() *MultiLangAST { return &MultiLangAST{parsers: make(map[string]interface{})} }
 
-type EmbeddingContrastive struct{ model interface{} }
+type EmbeddingContrastive struct{} //nolint:unused // placeholder for future model integration
 
 func NewEmbeddingContrastive() *EmbeddingContrastive { return &EmbeddingContrastive{} }
 
 type VariableNGram struct{ minN, maxN int }
 
 func NewVariableNGram(min, max int) *VariableNGram { return &VariableNGram{minN: min, maxN: max} }
 
-type TrainedEvaluatorHeads struct{ model interface{} }
+type TrainedEvaluatorHeads struct{} //nolint:unused // placeholder for future model integration
 
 func NewTrainedEvaluatorHeads() *TrainedEvaluatorHeads { return &TrainedEvaluatorHeads{} }
 
@@ -65,7 +65,7 @@ type SoftBudget struct{ limit, overflow int }
 
 func NewSoftBudget(l, o int) *SoftBudget { return &SoftBudget{limit: l, overflow: o} }
 
-type EmbeddingCompaction struct{ transformer interface{} }
+type EmbeddingCompaction struct{} //nolint:unused // placeholder for future transformer integration
 
 func NewEmbeddingCompaction() *EmbeddingCompaction { return &EmbeddingCompaction{} }