Implemented a bugfix for the whisperx stage, and added corresponding regression tests

internal/app/runner.go

@@ -6,6 +6,7 @@ import (
 	"log/slog"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"gitea.maximumdirect.net/eric/narratio/internal/adapters/analyzer"
 	"gitea.maximumdirect.net/eric/narratio/internal/adapters/audita"
@@ -51,7 +52,11 @@ func executeStages(ctx context.Context, cfg *config.Config, stages []stage.Stage
 		env.Logger = logging.NewLogger(os.Stderr, slog.LevelInfo)
 	}
 	if env.WhisperX == nil {
-		env.WhisperX = &whisperx.NoopClient{}
+		client, err := buildDefaultWhisperXClient(env.Config)
+		if err != nil {
+			return nil, fmt.Errorf("initialize whisperx client: %w", err)
+		}
+		env.WhisperX = client
 	}
 	if env.Seriatim == nil {
 		env.Seriatim = &seriatim.NoopRunner{}
@@ -145,6 +150,35 @@ func executeStages(ctx context.Context, cfg *config.Config, stages []stage.Stage
 	}, nil
 }
 
+func buildDefaultWhisperXClient(cfg *config.Config) (whisperx.Client, error) {
+	if cfg == nil || cfg.Pipeline == nil {
+		return &whisperx.NoopClient{}, nil
+	}
+
+	wx := cfg.Pipeline.WhisperX
+	if strings.TrimSpace(wx.TranscribeURL) == "" {
+		// Compatibility fallback for tests or internal call paths that bypass config validation.
+		return &whisperx.NoopClient{}, nil
+	}
+
+	retries := 0
+	if wx.Retries != nil {
+		retries = *wx.Retries
+	}
+
+	client, err := whisperx.NewHTTPClientFromConfigValues(
+		wx.TranscribeURL,
+		wx.Language,
+		wx.Timeout,
+		wx.RetryDelay,
+		retries,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("from pipeline.whisperx: %w", err)
+	}
+	return client, nil
+}
+
 func loadOrCreateManifest(ctx context.Context, store manifest.Store, path, sessionID string) (*manifest.Manifest, error) {
 	exists, err := fileExists(path)
 	if err != nil {