Fix the five library adoption review findings

internal/framework/validators/llm_validators.go

@@ -107,11 +107,15 @@ func (v *LLMBackedValidator) Validate(ctx context.Context, req Request) (Result,
 		var completion StructuredCompletionResponse
 		responseSchema := responseschema.MustLookup(responseschema.ValidatorDecisionSetKey)
 		promptMetadata := validatorPromptMetadata(v.validatorType)
-		stage := stagename.ValidatorBatch(req.ModuleInstance, v.name, batch.BatchIndex)
+		stageInstance := req.ModuleInstance
+		if req.SectionIndex != nil {
+			stageInstance = fmt.Sprintf("%s:section-%04d", stageInstance, *req.SectionIndex)
+		}
+		stage := stagename.ValidatorBatch(stageInstance, v.name, batch.BatchIndex)
 		completion, err = req.LLMClient.CompleteStructured(ctx, StructuredCompletionRequest{
 			PromptID: promptMetadata.PromptID, PromptVersion: promptMetadata.PromptVersion,
 			Variables: variables, Schema: responseschema.ValidatorDecisionSetKey,
-			Context: structuredoutput.DiagnosticContext{Role: "validation", ModuleKey: req.ModuleKey, ModuleInstance: req.ModuleInstance, BatchIndex: &batch.BatchIndex, ValidatorName: v.name},
+			Context: structuredoutput.DiagnosticContext{Role: "validation", ModuleKey: req.ModuleKey, ModuleInstance: req.ModuleInstance, SectionIndex: req.SectionIndex, BatchIndex: &batch.BatchIndex, ValidatorName: v.name},
 		}, &response)
 
 		artifacts := InteractionArtifacts{}

internal/framework/validators/models.go

@@ -29,6 +29,7 @@ const (
 
 // Request is the runtime input shared by deterministic validators.
 type Request struct {
+	SectionIndex      *int                                   `json:"section_index,omitempty"`
 	WorkingTranscript *schema.Transcript                     `json:"-"`
 	CandidateProposal []proposals.EnrichedCorrectionProposal `json:"candidate_proposals"`
 	ModuleKey         string                                 `json:"module_key"`