Define adapter interfaces and fake implementations

internal/adapters/audita/fake.go

@@ -0,0 +1,40 @@
+package audita
+
+import "context"
+
+// NoopRunner is a deterministic no-op audita adapter.
+type NoopRunner struct{}
+
+// Run returns requested output path with placeholder metadata.
+func (n *NoopRunner) Run(ctx context.Context, req PolishRequest) (PolishResult, error) {
+	if err := ctx.Err(); err != nil {
+		return PolishResult{}, err
+	}
+	return PolishResult{ProcessedTranscriptPath: req.OutputProcessedPath, Metadata: map[string]any{"placeholder": true}}, nil
+}
+
+// FakeRunner captures polish requests and returns deterministic responses.
+type FakeRunner struct {
+	Requests []PolishRequest
+	Err      error
+	Result   PolishResult
+}
+
+// Run records request and returns configured response.
+func (f *FakeRunner) Run(ctx context.Context, req PolishRequest) (PolishResult, error) {
+	if err := ctx.Err(); err != nil {
+		return PolishResult{}, err
+	}
+	f.Requests = append(f.Requests, req)
+	if f.Err != nil {
+		return PolishResult{}, f.Err
+	}
+	res := f.Result
+	if res.ProcessedTranscriptPath == "" {
+		res.ProcessedTranscriptPath = req.OutputProcessedPath
+	}
+	if res.Metadata == nil {
+		res.Metadata = map[string]any{"fake": true}
+	}
+	return res, nil
+}