Initialize narratio Go module and CLI scaffold

internal/adapters/analyzer/runner.go

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+// Package analyzer declares the adapter contract for artifact analysis generation.
+package analyzer
+
+import "context"
+
+// Runner is a placeholder adapter interface for session artifact generation.
+type Runner interface {
+	Run(ctx context.Context, req AnalysisRequest) (AnalysisResult, error)
+}
+
+// AnalysisRequest is a placeholder analyzer input.
+type AnalysisRequest struct {
+	ProcessedTranscriptPath string
+	OutputDir               string
+}
+
+// AnalysisResult is a placeholder analyzer output.
+type AnalysisResult struct {
+	ArtifactPaths []string
+}

internal/adapters/audita/runner.go

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+// Package audita declares the adapter contract for transcript polishing.
+package audita
+
+import "context"
+
+// Runner is a placeholder adapter interface for audita invocation.
+type Runner interface {
+	Run(ctx context.Context, req PolishRequest) (PolishResult, error)
+}
+
+// PolishRequest is a placeholder polish input.
+type PolishRequest struct {
+	MergedTranscriptPath string
+	OutputPath           string
+}
+
+// PolishResult is a placeholder polish output.
+type PolishResult struct {
+	ProcessedPath string
+}

internal/adapters/notify/sender.go

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+// Package notify declares the adapter contract for run notifications.
+package notify
+
+import "context"
+
+// Sender is a placeholder adapter interface for notifications.
+type Sender interface {
+	Send(ctx context.Context, msg Message) error
+}
+
+// Message is a placeholder notification payload.
+type Message struct {
+	Subject string
+	Body    string
+}

internal/adapters/seriatim/runner.go

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+// Package seriatim declares the adapter contract for transcript merge execution.
+package seriatim
+
+import "context"
+
+// Runner is a placeholder adapter interface for seriatim invocation.
+type Runner interface {
+	Run(ctx context.Context, req MergeRequest) (MergeResult, error)
+}
+
+// MergeRequest is a placeholder merge input.
+type MergeRequest struct {
+	TranscriptPaths []string
+	OutputPath      string
+}
+
+// MergeResult is a placeholder merge output.
+type MergeResult struct {
+	MergedPath string
+}

internal/adapters/whisperx/client.go

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+// 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
+}