Implement artifact-level render command with Markdown output and update docs

internal/config/config_test.go

@@ -804,6 +804,97 @@ func TestNewNormalizeConfigTreatsWhitespaceReportFileAsOmitted(t *testing.T) {
 	}
 }
 
+func TestNewRenderConfigRequiresInputOutputAndFormat(t *testing.T) {
+	dir := t.TempDir()
+	input := writeTempFile(t, dir, "input.json")
+	output := filepath.Join(dir, "rendered.md")
+
+	_, err := NewRenderConfig(RenderOptions{
+		OutputFile: output,
+		Format:     RenderFormatMarkdown,
+	})
+	if err == nil || !strings.Contains(err.Error(), "--input-file is required") {
+		t.Fatalf("expected input-file required error, got %v", err)
+	}
+
+	_, err = NewRenderConfig(RenderOptions{
+		InputFile: input,
+		Format:    RenderFormatMarkdown,
+	})
+	if err == nil || !strings.Contains(err.Error(), "--output-file is required") {
+		t.Fatalf("expected output-file required error, got %v", err)
+	}
+
+	_, err = NewRenderConfig(RenderOptions{
+		InputFile:  input,
+		OutputFile: output,
+	})
+	if err == nil || !strings.Contains(err.Error(), "--format is required") {
+		t.Fatalf("expected format required error, got %v", err)
+	}
+}
+
+func TestNewRenderConfigRejectsUnknownFormat(t *testing.T) {
+	dir := t.TempDir()
+	input := writeTempFile(t, dir, "input.json")
+	output := filepath.Join(dir, "rendered.md")
+
+	opts := validRenderOptions(input, output)
+	opts.Format = "txt"
+	_, err := NewRenderConfig(opts)
+	if err == nil {
+		t.Fatal("expected format validation error")
+	}
+	if !strings.Contains(err.Error(), "--format must be") {
+		t.Fatalf("unexpected error: %v", err)
+	}
+}
+
+func TestNewRenderConfigAppliesDefaultsAndFlags(t *testing.T) {
+	dir := t.TempDir()
+	input := writeTempFile(t, dir, "input.json")
+	output := filepath.Join(dir, "rendered.md")
+
+	cfg, err := NewRenderConfig(validRenderOptions(input, output))
+	if err != nil {
+		t.Fatalf("config failed: %v", err)
+	}
+	if cfg.Title != DefaultRenderTitle {
+		t.Fatalf("title = %q, want %q", cfg.Title, DefaultRenderTitle)
+	}
+	if !cfg.IncludeTimestamps {
+		t.Fatal("include timestamps should default true")
+	}
+	if cfg.IncludeSegmentIDs {
+		t.Fatal("include segment IDs should default false")
+	}
+	if cfg.IncludeMetadata {
+		t.Fatal("include metadata should default false")
+	}
+
+	opts := validRenderOptions(input, output)
+	opts.Title = "Meeting Notes"
+	opts.IncludeTimestamps = false
+	opts.IncludeSegmentIDs = true
+	opts.IncludeMetadata = true
+	cfg, err = NewRenderConfig(opts)
+	if err != nil {
+		t.Fatalf("config failed: %v", err)
+	}
+	if cfg.Title != "Meeting Notes" {
+		t.Fatalf("title = %q, want Meeting Notes", cfg.Title)
+	}
+	if cfg.IncludeTimestamps {
+		t.Fatal("include timestamps should be false")
+	}
+	if !cfg.IncludeSegmentIDs {
+		t.Fatal("include segment IDs should be true")
+	}
+	if !cfg.IncludeMetadata {
+		t.Fatal("include metadata should be true")
+	}
+}
+
 func assertPositiveFloatEnvValidation(t *testing.T, envName string) {
 	t.Helper()
 
@@ -862,6 +953,18 @@ func validNormalizeOptions(inputFile string, outputFile string) NormalizeOptions
 	}
 }
 
+func validRenderOptions(inputFile string, outputFile string) RenderOptions {
+	return RenderOptions{
+		InputFile:         inputFile,
+		OutputFile:        outputFile,
+		Format:            RenderFormatMarkdown,
+		Title:             DefaultRenderTitle,
+		IncludeTimestamps: true,
+		IncludeSegmentIDs: false,
+		IncludeMetadata:   false,
+	}
+}
+
 func writeTempFile(t *testing.T, dir string, name string) string {
 	t.Helper()