Add canonical chunk plan source model

internal/framework/pipeline/runner_extract_handoff_test.go

@@ -2,10 +2,12 @@ package pipeline
 
 import (
 	"context"
+	"encoding/json"
 	"reflect"
 	"strings"
 	"testing"
 
+	"gitea.maximumdirect.net/eric/notarius/internal/core/source"
 	"gitea.maximumdirect.net/eric/notarius/internal/framework/contracts"
 )
 
@@ -50,6 +52,31 @@ func cloneCheckpointArtifacts(values []CheckpointArtifact) []CheckpointArtifact
 	return cloned
 }
 
+func TestRunnerPassesIndependentAnnotationScopesToExtractors(t *testing.T) {
+	prepared := preparedAttemptDebugPipeline(t)
+	chunker := prepared.chunker.(*typedTestChunker)
+	chunker.chunks[0].Annotations = source.ChunkAnnotations{"same": json.RawMessage(`{"range":1}`)}
+	chunker.chunks[0].PlanAnnotations = source.ChunkAnnotations{"same": json.RawMessage(`{"plan":2}`)}
+
+	var gotRange, gotPlan string
+	installExtractOperation(prepared, 0, func(_ context.Context, request contracts.TypedExtractionRequest) (erasedTypedResult, error) {
+		gotRange = string(request.Chunk.Annotations["same"])
+		gotPlan = string(request.Chunk.PlanAnnotations["same"])
+		request.Chunk.Annotations["same"][0] = '['
+		request.Chunk.PlanAnnotations["same"][0] = '['
+		return erasedTypedResult{Value: typedValueForLane(0, request.Chunk.Index)}, nil
+	})
+	if _, err := New().Run(context.Background(), RunInput{Prepared: prepared, RawInput: []byte("input")}); err != nil {
+		t.Fatalf("Run() error = %v, want nil", err)
+	}
+	if gotRange != `{"range":1}` || gotPlan != `{"plan":2}` {
+		t.Fatalf("extract annotations = %q / %q", gotRange, gotPlan)
+	}
+	if string(chunker.chunks[0].Annotations["same"]) != `{"range":1}` || string(chunker.chunks[0].PlanAnnotations["same"]) != `{"plan":2}` {
+		t.Fatal("extract request shares annotation bytes with chunker output")
+	}
+}
+
 func TestRunnerContinuesFromFreshAndReusedExtractResults(t *testing.T) {
 	prepared := preparedAttemptDebugPipeline(t)
 	extractCalls := 0