Implement Audita subprocess adapter

internal/adapters/audita/fake.go

@@ -2,7 +2,10 @@ package audita
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
+	"os"
+	"path/filepath"
 
 	"gitea.maximumdirect.net/eric/narratio/internal/adapters/subprocess"
 )
@@ -18,7 +21,15 @@ func (n *NoopRunner) Run(ctx context.Context, req PolishRequest) (PolishResult,
 	if err := materializePlaceholders(req); err != nil {
 		return PolishResult{}, err
 	}
-	return PolishResult{ProcessedTranscriptPath: req.OutputProcessedPath, Metadata: map[string]any{"placeholder": true}}, nil
+	return PolishResult{
+		ProcessedTranscriptPath: req.OutputProcessedPath,
+		ReportPath:              req.ReportPath,
+		WorkDir:                 req.WorkDir,
+		StdoutLogPath:           req.StdoutLogPath,
+		StderrLogPath:           req.StderrLogPath,
+		GeneratedConfigPath:     req.GeneratedConfigPath,
+		Metadata:                map[string]any{"placeholder": true},
+	}, nil
 }
 
 // FakeRunner captures polish requests and returns deterministic responses.
@@ -44,6 +55,21 @@ func (f *FakeRunner) Run(ctx context.Context, req PolishRequest) (PolishResult,
 	if res.ProcessedTranscriptPath == "" {
 		res.ProcessedTranscriptPath = req.OutputProcessedPath
 	}
+	if res.ReportPath == "" {
+		res.ReportPath = req.ReportPath
+	}
+	if res.WorkDir == "" {
+		res.WorkDir = req.WorkDir
+	}
+	if res.StdoutLogPath == "" {
+		res.StdoutLogPath = req.StdoutLogPath
+	}
+	if res.StderrLogPath == "" {
+		res.StderrLogPath = req.StderrLogPath
+	}
+	if res.GeneratedConfigPath == "" {
+		res.GeneratedConfigPath = req.GeneratedConfigPath
+	}
 	if res.Metadata == nil {
 		res.Metadata = map[string]any{"fake": true}
 	}
@@ -72,5 +98,34 @@ func materializePlaceholders(req PolishRequest) error {
 			return fmt.Errorf("write stderr log %q: %w", req.StderrLogPath, err)
 		}
 	}
+	if err := writeJSONIfRequested(req.OutputProcessedPath, map[string]any{
+		"schema":   "audita.processed.v1",
+		"segments": []any{},
+	}); err != nil {
+		return err
+	}
+	if err := writeJSONIfRequested(req.ReportPath, map[string]any{
+		"schema": "audita.report.v1",
+		"steps":  []any{},
+	}); err != nil {
+		return err
+	}
+	return nil
+}
+
+func writeJSONIfRequested(path string, payload any) error {
+	if path == "" {
+		return nil
+	}
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		return fmt.Errorf("create parent directory %q: %w", filepath.Dir(path), err)
+	}
+	data, err := json.Marshal(payload)
+	if err != nil {
+		return fmt.Errorf("marshal placeholder json for %q: %w", path, err)
+	}
+	if err := subprocess.WriteFileAtomic(path, data, 0o644); err != nil {
+		return fmt.Errorf("write placeholder json %q: %w", path, err)
+	}
 	return nil
 }