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

internal/config/config.go

@@ -16,6 +16,8 @@ const (
 	DefaultInputReader            = "json-files"
 	DefaultOutputModules          = "json"
 	DefaultOutputSchema           = OutputSchemaIntermediate
+	DefaultRenderTitle            = "Transcript"
+	RenderFormatMarkdown          = "markdown"
 	DefaultPreprocessingModules   = "validate-raw,normalize-speakers,trim-text"
 	DefaultPostprocessingModules  = "detect-overlaps,resolve-overlaps,backchannel,filler,resolve-danglers,coalesce,detect-overlaps,autocorrect,assign-ids,validate-output"
 	DefaultOverlapWordRunGap      = 1.0
@@ -69,6 +71,17 @@ type NormalizeOptions struct {
 	OutputModules string
 }
 
+// RenderOptions captures raw CLI option values before validation.
+type RenderOptions struct {
+	InputFile         string
+	OutputFile        string
+	Format            string
+	Title             string
+	IncludeTimestamps bool
+	IncludeSegmentIDs bool
+	IncludeMetadata   bool
+}
+
 // Config is the validated runtime configuration for a merge invocation.
 type Config struct {
 	InputFiles             []string
@@ -108,6 +121,17 @@ type NormalizeConfig struct {
 	OutputModules []string
 }
 
+// RenderConfig is the validated runtime configuration for a render invocation.
+type RenderConfig struct {
+	InputFile         string
+	OutputFile        string
+	Format            string
+	Title             string
+	IncludeTimestamps bool
+	IncludeSegmentIDs bool
+	IncludeMetadata   bool
+}
+
 // NewMergeConfig validates raw merge options and returns normalized config.
 func NewMergeConfig(opts MergeOptions) (Config, error) {
 	cfg := Config{
@@ -303,6 +327,42 @@ func NewNormalizeConfig(opts NormalizeOptions) (NormalizeConfig, error) {
 	}, nil
 }
 
+// NewRenderConfig validates raw render options and returns normalized config.
+func NewRenderConfig(opts RenderOptions) (RenderConfig, error) {
+	inputFile, err := normalizeSingleInputFile(opts.InputFile, "--input-file")
+	if err != nil {
+		return RenderConfig{}, err
+	}
+
+	outputFile, err := normalizeOutputPath(opts.OutputFile, "--output-file")
+	if err != nil {
+		return RenderConfig{}, err
+	}
+
+	format := strings.TrimSpace(opts.Format)
+	if format == "" {
+		return RenderConfig{}, errors.New("--format is required")
+	}
+	if err := validateRenderFormat(format); err != nil {
+		return RenderConfig{}, err
+	}
+
+	title := strings.TrimSpace(opts.Title)
+	if title == "" {
+		title = DefaultRenderTitle
+	}
+
+	return RenderConfig{
+		InputFile:         inputFile,
+		OutputFile:        outputFile,
+		Format:            format,
+		Title:             title,
+		IncludeTimestamps: opts.IncludeTimestamps,
+		IncludeSegmentIDs: opts.IncludeSegmentIDs,
+		IncludeMetadata:   opts.IncludeMetadata,
+	}, nil
+}
+
 func parseModuleList(value string) ([]string, error) {
 	value = strings.TrimSpace(value)
 	if value == "" {
@@ -485,3 +545,12 @@ func validateNormalizeOutputModules(modules []string) error {
 	}
 	return nil
 }
+
+func validateRenderFormat(format string) error {
+	switch format {
+	case RenderFormatMarkdown:
+		return nil
+	default:
+		return fmt.Errorf("--format must be %q", RenderFormatMarkdown)
+	}
+}