Initialize narratio Go module and CLI scaffold

internal/adapters/whisperx/client.go

@@ -0,0 +1,20 @@
+// Package whisperx declares the adapter contract for WhisperX transcription.
+package whisperx
+
+import "context"
+
+// Client is a placeholder adapter interface for WhisperX interactions.
+type Client interface {
+	Transcribe(ctx context.Context, req TranscriptionRequest) (TranscriptionResult, error)
+}
+
+// TranscriptionRequest is a placeholder transcription input.
+type TranscriptionRequest struct {
+	Speaker   string
+	AudioPath string
+}
+
+// TranscriptionResult is a placeholder transcription output.
+type TranscriptionResult struct {
+	TranscriptPath string
+}