Add artifact workdir layout and locking

internal/app/plan_test.go

@@ -0,0 +1,61 @@
+package app
+
+import (
+	"bytes"
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/narratio/internal/artifacts"
+)
+
+func TestPlanCreatesAndReusesWorkdir(t *testing.T) {
+	workspaceRoot := t.TempDir()
+	pipelinePath, sessionPath := writeValidConfigFiles(t, workspaceRoot)
+
+	var out bytes.Buffer
+	args := []string{"--config", pipelinePath, "--session", sessionPath}
+
+	if err := Plan(context.Background(), args, &out); err != nil {
+		t.Fatalf("first Plan() error = %v", err)
+	}
+	if !strings.Contains(out.String(), "workdir prepared") {
+		t.Fatalf("first output = %q, want workdir prepared", out.String())
+	}
+
+	sessionWorkdir := artifacts.SessionWorkDir(workspaceRoot, "2026-05-03")
+	expectedDirs := []string{
+		sessionWorkdir,
+		filepath.Join(sessionWorkdir, "inputs"),
+		filepath.Join(sessionWorkdir, "audio"),
+		filepath.Join(sessionWorkdir, "transcripts", "raw"),
+		filepath.Join(sessionWorkdir, "transcripts", "normalized"),
+		filepath.Join(sessionWorkdir, "artifacts"),
+		filepath.Join(sessionWorkdir, "config"),
+		filepath.Join(sessionWorkdir, "logs"),
+	}
+	for _, dir := range expectedDirs {
+		assertDir(t, dir)
+	}
+
+	out.Reset()
+	if err := Plan(context.Background(), args, &out); err != nil {
+		t.Fatalf("second Plan() error = %v", err)
+	}
+	if !strings.Contains(out.String(), "workdir prepared") {
+		t.Fatalf("second output = %q, want workdir prepared", out.String())
+	}
+}
+
+func assertDir(t *testing.T, path string) {
+	t.Helper()
+	info, err := os.Stat(path)
+	if err != nil {
+		t.Fatalf("Stat(%q) error = %v", path, err)
+	}
+	if !info.IsDir() {
+		t.Fatalf("%q is not a directory", path)
+	}
+}