Build evidence context for output encoders

internal/framework/pipeline/runner.go

@@ -294,6 +294,20 @@ func (r *Runner) Run(ctx context.Context, input RunInput) (output RunOutput, err
 		return failOutput(output), err
 	}
 	outputStarted := time.Now().UTC()
+	evidenceArtifact, evidenceSummary, err := buildOutputEvidenceContext(input.Prepared, doc, output.NormalizeOutputs)
+	if err != nil {
+		return failOutput(output), err
+	}
+	if evidenceSummary != nil {
+		if err := writeDebugTimed(debugRecorder, "output/evidence-context.json", debugTimedEnvelope{
+			Stage:     string(StageOutput),
+			ModuleKey: encoder.Key(),
+			StartedAt: outputStarted,
+			Payload:   *evidenceSummary,
+		}); err != nil {
+			return failOutput(output), fmt.Errorf("write evidence context debug artifact: %w", err)
+		}
+	}
 	outputDebugPayload := map[string]any{
 		"manifest":          output.Manifest,
 		"normalize_outputs": debugSerializedOutputEnvelopes(output.NormalizeOutputs),
@@ -325,6 +339,7 @@ func (r *Runner) Run(ctx context.Context, input RunInput) (output RunOutput, err
 		LLMProfile:       input.pipeline.Output.LLMProfile,
 		Metadata:         outputMetadata,
 		ChunkMap:         contracts.CloneSerializedArtifactPointer(acceptedChunkMap),
+		EvidenceContext:  contracts.CloneSerializedArtifactPointer(evidenceArtifact),
 	})
 	output.Warnings = append(output.Warnings, encoded.Warnings...)
 	if err != nil {