Add render artifact model, config, and Seriatim adapter contracts

internal/adapters/seriatim/subprocess.go

@@ -8,6 +8,7 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode/utf8"
 
 	"gitea.maximumdirect.net/eric/narratio/internal/adapters/subprocess"
 )
@@ -384,6 +385,96 @@ func (r *SubprocessRunner) Normalize(ctx context.Context, req NormalizeRequest)
 	}, nil
 }
 
+// Render executes Seriatim render with deterministic flags and validates non-empty text output.
+func (r *SubprocessRunner) Render(ctx context.Context, req RenderRequest) (RenderResult, error) {
+	if r == nil {
+		return RenderResult{}, fmt.Errorf("seriatim subprocess runner is nil")
+	}
+	if strings.TrimSpace(req.InputTranscriptPath) == "" {
+		return RenderResult{}, fmt.Errorf("seriatim render input path is required")
+	}
+	if strings.TrimSpace(req.OutputRenderedPath) == "" {
+		return RenderResult{}, fmt.Errorf("seriatim render output path is required")
+	}
+	format := strings.TrimSpace(req.Format)
+	if format == "" {
+		format = "markdown"
+	}
+	if format != "markdown" {
+		return RenderResult{}, fmt.Errorf("seriatim render format %q is unsupported", req.Format)
+	}
+
+	binary := r.binary
+	if strings.TrimSpace(req.Binary) != "" {
+		binary = strings.TrimSpace(req.Binary)
+	}
+
+	timeout := r.timeout
+	if req.Timeout < 0 {
+		return RenderResult{}, fmt.Errorf("seriatim render timeout must be >= 0")
+	}
+	if req.Timeout > 0 {
+		timeout = req.Timeout
+	}
+
+	args := buildRenderArgs(req, format)
+	if req.GeneratedConfigPath != "" {
+		if err := writeRenderInvocationConfig(req, args, binary, timeout, format); err != nil {
+			return RenderResult{}, fmt.Errorf("write seriatim render invocation config %q: %w", req.GeneratedConfigPath, err)
+		}
+	}
+
+	runRes, err := subprocess.Run(ctx, subprocess.RunRequest{
+		Executable:    binary,
+		Args:          args,
+		Timeout:       timeout,
+		StdoutLogPath: req.StdoutLogPath,
+		StderrLogPath: req.StderrLogPath,
+	})
+	if err != nil {
+		return RenderResult{
+			OutputRenderedPath:  req.OutputRenderedPath,
+			StdoutLogPath:       req.StdoutLogPath,
+			StderrLogPath:       req.StderrLogPath,
+			GeneratedConfigPath: req.GeneratedConfigPath,
+			ExitCode:            runRes.ExitCode,
+			Duration:            runRes.Duration,
+			InvokedBinary:       binary,
+			Format:              format,
+			Title:               req.Title,
+		}, fmt.Errorf("run seriatim render (binary=%q): %w", binary, err)
+	}
+
+	if err := validateNonEmptyTextFile(req.OutputRenderedPath); err != nil {
+		return RenderResult{
+			OutputRenderedPath:  req.OutputRenderedPath,
+			StdoutLogPath:       req.StdoutLogPath,
+			StderrLogPath:       req.StderrLogPath,
+			GeneratedConfigPath: req.GeneratedConfigPath,
+			ExitCode:            runRes.ExitCode,
+			Duration:            runRes.Duration,
+			InvokedBinary:       binary,
+			Format:              format,
+			Title:               req.Title,
+		}, fmt.Errorf("validate seriatim rendered output %q: %w", req.OutputRenderedPath, err)
+	}
+
+	return RenderResult{
+		OutputRenderedPath:  req.OutputRenderedPath,
+		StdoutLogPath:       req.StdoutLogPath,
+		StderrLogPath:       req.StderrLogPath,
+		GeneratedConfigPath: req.GeneratedConfigPath,
+		ExitCode:            runRes.ExitCode,
+		Duration:            runRes.Duration,
+		InvokedBinary:       binary,
+		Format:              format,
+		Title:               req.Title,
+		Metadata: map[string]any{
+			"adapter": "seriatim_subprocess",
+		},
+	}, nil
+}
+
 func (r *SubprocessRunner) buildMergeArgs(req MergeRequest) []string {
 	args := []string{"merge"}
 
@@ -480,6 +571,22 @@ func buildNormalizeArgs(req NormalizeRequest, outputSchema string) []string {
 	return args
 }
 
+func buildRenderArgs(req RenderRequest, format string) []string {
+	args := []string{
+		"render",
+		"--input-file", req.InputTranscriptPath,
+		"--output-file", req.OutputRenderedPath,
+		"--format", format,
+		"--include-timestamps", strconv.FormatBool(req.IncludeTimestamps),
+		"--include-segment-ids", strconv.FormatBool(req.IncludeSegmentIDs),
+		"--include-metadata", strconv.FormatBool(req.IncludeMetadata),
+	}
+	if strings.TrimSpace(req.Title) != "" {
+		args = append(args, "--title", req.Title)
+	}
+	return args
+}
+
 func writeTrimInvocationConfig(req TrimRequest, args []string, binary string, timeout time.Duration) error {
 	payload := map[string]any{
 		"schema":        "seriatim.generated.v1",
@@ -509,6 +616,24 @@ func writeNormalizeInvocationConfig(req NormalizeRequest, args []string, binary
 	return subprocess.WriteYAMLAtomic(req.GeneratedConfigPath, payload, 0o644)
 }
 
+func writeRenderInvocationConfig(req RenderRequest, args []string, binary string, timeout time.Duration, format string) error {
+	payload := map[string]any{
+		"schema":              "seriatim.generated.v1",
+		"command":             "render",
+		"binary":              binary,
+		"args":                args,
+		"timeout":             timeout.String(),
+		"input_path":          req.InputTranscriptPath,
+		"output_path":         req.OutputRenderedPath,
+		"format":              format,
+		"title":               req.Title,
+		"include_timestamps":  req.IncludeTimestamps,
+		"include_segment_ids": req.IncludeSegmentIDs,
+		"include_metadata":    req.IncludeMetadata,
+	}
+	return subprocess.WriteYAMLAtomic(req.GeneratedConfigPath, payload, 0o644)
+}
+
 func validateJSONFile(path string) error {
 	data, err := os.ReadFile(path)
 	if err != nil {
@@ -541,3 +666,20 @@ func validateJSONFileWithSegments(path string) error {
 	}
 	return nil
 }
+
+func validateNonEmptyTextFile(path string) error {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return fmt.Errorf("read file: %w", err)
+	}
+	if len(data) == 0 {
+		return fmt.Errorf("file is empty")
+	}
+	if !utf8.Valid(data) {
+		return fmt.Errorf("file is not valid utf-8 text")
+	}
+	if strings.TrimSpace(string(data)) == "" {
+		return fmt.Errorf("file has no non-whitespace content")
+	}
+	return nil
+}