Harden chunk plan cache storage and reuse

internal/framework/pipeline/runner_chunk_plan_test.go

@@ -2,6 +2,7 @@ package pipeline
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"reflect"
 	"strings"
@@ -242,6 +243,22 @@ func TestRunnerRegeneratesStructurallyInvalidHit(t *testing.T) {
 	}
 }
 
+func TestRunnerReusesCrossDomainAnnotationsAsOptionalData(t *testing.T) {
+	prepared, plan := preparedTerminalDebugPipeline(t)
+	plan.Annotations = source.ChunkAnnotations{"dnd/scenes": json.RawMessage(`{"boundary_caveats":["uncertain"]}`)}
+	plan.Ranges[0].Annotations = source.ChunkAnnotations{"dnd/scenes": json.RawMessage(`{"title":"Opening"}`)}
+	record := chunkPlanRecord(t, prepared, plan)
+	record.Producer.ChunkModule = "dnd/scenes"
+	store := &recordingChunkPlanStore{record: record, decision: ChunkPlanDecision{Status: ChunkPlanHit}}
+	output, err := New().Run(context.Background(), RunInput{Prepared: prepared, RawInput: []byte("input"), ChunkCacheMode: ChunkCacheAuto, ChunkPlans: store})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if output.Manifest.ChunkPlan.ProducerModule != "dnd/scenes" || output.Manifest.ChunkPlan.Action != "reused" {
+		t.Fatalf("cross-domain annotation plan was not reused: %#v", output.Manifest.ChunkPlan)
+	}
+}
+
 func TestRunnerRetriesBeforePublishingAcceptedPlan(t *testing.T) {
 	prepared, plan := preparedTerminalDebugPipeline(t)
 	prepared.resolved.Chunk.Retries = 1