Added a new JSON public schema as the default output artifact

internal/artifact/transcript.go

@@ -57,6 +57,31 @@ func FromMerged(cfg config.Config, merged model.MergedTranscript) schema.Transcr
 	}
 }
 
+// DefaultFromMerged converts the internal merged transcript model into the
+// compact default public serialized output contract.
+func DefaultFromMerged(cfg config.Config, merged model.MergedTranscript) schema.DefaultTranscript {
+	segments := make([]schema.DefaultSegment, len(merged.Segments))
+	for index, segment := range merged.Segments {
+		segments[index] = schema.DefaultSegment{
+			ID:         segment.ID,
+			Start:      segment.Start,
+			End:        segment.End,
+			Speaker:    segment.Speaker,
+			Text:       segment.Text,
+			Categories: append([]string(nil), segment.Categories...),
+		}
+	}
+
+	return schema.DefaultTranscript{
+		Metadata: schema.DefaultMetadata{
+			Application:  ApplicationName,
+			Version:      buildinfo.Version,
+			OutputSchema: config.OutputSchemaDefault,
+		},
+		Segments: segments,
+	}
+}
+
 // MinimalFromMerged converts the internal merged transcript model into the
 // compact public serialized output contract.
 func MinimalFromMerged(cfg config.Config, merged model.MergedTranscript) schema.MinimalTranscript {
@@ -85,8 +110,12 @@ func MinimalFromMerged(cfg config.Config, merged model.MergedTranscript) schema.
 // runtime-selected public output contract.
 func SelectedFromMerged(cfg config.Config, merged model.MergedTranscript) any {
 	switch cfg.OutputSchema {
+	case config.OutputSchemaDefault:
+		return DefaultFromMerged(cfg, merged)
 	case config.OutputSchemaMinimal:
 		return MinimalFromMerged(cfg, merged)
+	case config.OutputSchemaSeriatim:
+		return FromMerged(cfg, merged)
 	default:
 		return FromMerged(cfg, merged)
 	}

internal/artifact/transcript_test.go

@@ -30,6 +30,57 @@ func TestSelectedFromMergedDefaultsToSeriatimTranscript(t *testing.T) {
 	}
 }
 
+func TestSelectedFromMergedUsesDefaultWhenConfigured(t *testing.T) {
+	got := SelectedFromMerged(config.Config{OutputSchema: config.OutputSchemaDefault}, model.MergedTranscript{})
+	if _, ok := got.(schema.DefaultTranscript); !ok {
+		t.Fatalf("selected artifact type = %T, want schema.DefaultTranscript", got)
+	}
+}
+
+func TestSelectedFromMergedUsesSeriatimWhenConfigured(t *testing.T) {
+	got := SelectedFromMerged(config.Config{OutputSchema: config.OutputSchemaSeriatim}, model.MergedTranscript{})
+	if _, ok := got.(schema.Transcript); !ok {
+		t.Fatalf("selected artifact type = %T, want schema.Transcript", got)
+	}
+}
+
+func TestDefaultFromMergedEmitsOnlyDefaultShape(t *testing.T) {
+	merged := model.MergedTranscript{
+		Segments: []model.Segment{
+			{
+				ID:             1,
+				Source:         "input.json",
+				SourceRef:      "word-run:1:1:1",
+				DerivedFrom:    []string{"input.json#0"},
+				Speaker:        "Alice",
+				Start:          1,
+				End:            2,
+				Text:           "hello",
+				Categories:     []string{"backchannel"},
+				OverlapGroupID: 1,
+			},
+		},
+		OverlapGroups: []model.OverlapGroup{
+			{ID: 1, Start: 1, End: 2, Segments: []string{"input.json#0"}, Speakers: []string{"Alice"}, Class: "unknown", Resolution: "unresolved"},
+		},
+	}
+
+	got := DefaultFromMerged(config.Config{OutputSchema: config.OutputSchemaDefault}, merged)
+	want := schema.DefaultTranscript{
+		Metadata: schema.DefaultMetadata{
+			Application:  ApplicationName,
+			Version:      buildinfo.Version,
+			OutputSchema: config.OutputSchemaDefault,
+		},
+		Segments: []schema.DefaultSegment{
+			{ID: 1, Start: 1, End: 2, Speaker: "Alice", Text: "hello", Categories: []string{"backchannel"}},
+		},
+	}
+	if !reflect.DeepEqual(got, want) {
+		t.Fatalf("default transcript = %#v, want %#v", got, want)
+	}
+}
+
 func TestMinimalFromMergedEmitsOnlyMinimalShape(t *testing.T) {
 	merged := model.MergedTranscript{
 		Segments: []model.Segment{