diff --git a/internal/core/smoke_test.go b/internal/core/smoke_test.go
new file mode 100644
index 0000000..566599c
--- /dev/null
+++ b/internal/core/smoke_test.go
@@ -0,0 +1,278 @@
+package core
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"verstak/internal/core/actions"
+	"verstak/internal/core/files"
+	"verstak/internal/core/notes"
+	"verstak/internal/core/nodes"
+	"verstak/internal/core/search"
+	"verstak/internal/core/storage"
+	"verstak/internal/core/vault"
+	"verstak/internal/core/worklog"
+)
+
+func openTestDB(t *testing.T) *storage.DB {
+	t.Helper()
+	dir := t.TempDir()
+	db, err := storage.Open(filepath.Join(dir, "test.db"))
+	if err != nil {
+		t.Fatalf("open db: %v", err)
+	}
+	t.Cleanup(func() { db.Close() })
+	return db
+}
+
+func TestMVPSmoke(t *testing.T) {
+	// Create a test vault with a real filesystem area.
+	vaultDir := t.TempDir()
+
+	// 1. Init vault.
+	if err := vault.Init(vaultDir); err != nil {
+		t.Fatalf("vault init: %v", err)
+	}
+
+	db := openTestDB(t)
+	nodeRepo := nodes.NewRepository(db)
+	fileSvc := files.NewService(db, vaultDir, nodeRepo)
+	noteSvc := notes.NewService(db, vaultDir, nodeRepo, fileSvc)
+	actionSvc := actions.NewService(db)
+	worklogSvc := worklog.NewService(db)
+	searchSvc := search.NewService(db)
+
+	// 2. Create client case structure.
+	client, err := nodeRepo.Create("", nodes.TypeCase, "ООО Ромашка", "clients")
+	if err != nil {
+		t.Fatalf("create client: %v", err)
+	}
+	project, err := nodeRepo.Create(client.ID, nodes.TypeCase, "Сайт", "")
+	if err != nil {
+		t.Fatalf("create project: %v", err)
+	}
+
+	// 3. Create a Markdown note.
+	noteNode, noteRec, err := noteSvc.Create(project.ID, "overview.md", "")
+	if err != nil {
+		t.Fatalf("create note: %v", err)
+	}
+	if noteNode.Title != "overview.md" {
+		t.Errorf("note title = %q, want overview.md", noteNode.Title)
+	}
+
+	// 4. Write note content.
+	content := "# Сайт ООО Ромашка\n\nWordPress/nginx. Иногда обновление."
+	if err := noteSvc.Save(noteNode.ID, content); err != nil {
+		t.Fatalf("save note: %v", err)
+	}
+
+	// 5. Read note back.
+	got, err := noteSvc.Read(noteNode.ID)
+	if err != nil {
+		t.Fatalf("read note: %v", err)
+	}
+	if got != content {
+		t.Errorf("note content mismatch: got %q, want %q", got, content)
+	}
+
+	// 6. Verify note file exists on disk.
+	noteFileRecs, _ := fileSvc.ListByNode(noteNode.ID)
+	notePath := ""
+	if len(noteFileRecs) > 0 {
+		notePath = noteFileRecs[0].Path
+		if _, err := os.Stat(notePath); os.IsNotExist(err) {
+			t.Errorf("note file not on disk: %s", notePath)
+		}
+	}
+	_ = noteRec
+
+	// 7. Add a dummy external file.
+	dummyPath := filepath.Join(vaultDir, "dogovor.docx")
+	if err := os.WriteFile(dummyPath, []byte("dummy contract data"), 0644); err != nil {
+		t.Fatal(err)
+	}
+	created, err := fileSvc.AddPathCopy(project.ID, dummyPath)
+	if err != nil {
+		t.Fatalf("add file: %v", err)
+	}
+	if len(created) == 0 {
+		t.Fatal("no nodes created from file import")
+	}
+
+	// 8. Open the imported file (just verify it opens without error).
+	fileNode := created[0]
+	if fileNode.Type != nodes.TypeFile {
+		t.Errorf("expected file type, got %s", fileNode.Type)
+	}
+	fileRecs, err := fileSvc.ListByNode(fileNode.ID)
+	if err != nil || len(fileRecs) == 0 {
+		t.Fatalf("file record not found for imported file")
+	}
+	_ = fileSvc.Open(fileRecs[0].ID) // may fail in test (no display)
+
+	// 9. Verify the imported file node exists as a child of the project.
+	children, err := nodeRepo.ListChildren(project.ID, false)
+	if err != nil {
+		t.Fatalf("list children: %v", err)
+	}
+	hasImported := false
+	for _, c := range children {
+		if c.Type == nodes.TypeFile && c.Title == "dogovor.docx" {
+			hasImported = true
+			break
+		}
+	}
+	if !hasImported {
+		t.Error("imported file node not found under project")
+	}
+
+	// 10. Create actions.
+	urlAction, err := actionSvc.Create(project.ID, actions.KindOpenURL, "Открыть сайт", "", "", "https://example.com", nil, false, false)
+	if err != nil {
+		t.Fatalf("create url action: %v", err)
+	}
+	if urlAction.Kind != actions.KindOpenURL {
+		t.Errorf("action kind = %s, want %s", urlAction.Kind, actions.KindOpenURL)
+	}
+
+	folderAction, err := actionSvc.Create(project.ID, actions.KindOpenFolder, "Открыть папку", vaultDir, "", "", nil, false, false)
+	if err != nil {
+		t.Fatalf("create folder action: %v", err)
+	}
+	if folderAction.Kind != actions.KindOpenFolder {
+		t.Errorf("action kind = %s", folderAction.Kind)
+	}
+
+	// 11. List actions.
+	actionList, err := actionSvc.ListByNode(project.ID)
+	if err != nil {
+		t.Fatalf("list actions: %v", err)
+	}
+	if len(actionList) != 2 {
+		t.Errorf("expected 2 actions, got %d", len(actionList))
+	}
+
+	// 12. Run an action (open URL — should not error).
+	_, err = actionSvc.Run(urlAction.ID)
+	if err != nil {
+		t.Fatalf("run url action: %v", err)
+	}
+
+	// 13. Add worklog.
+	entry, err := worklogSvc.Add(project.ID, "Обновил витрину сайта, баннеры", "", 180, false, false)
+	if err != nil {
+		t.Fatalf("add worklog: %v", err)
+	}
+	if entry.Minutes == nil || *entry.Minutes != 180 {
+		t.Errorf("worklog minutes = %v, want 180", entry.Minutes)
+	}
+
+	// 14. List worklog.
+	worklogList, err := worklogSvc.ListByNode(project.ID)
+	if err != nil {
+		t.Fatalf("list worklog: %v", err)
+	}
+	if len(worklogList) != 1 {
+		t.Errorf("expected 1 worklog entry, got %d", len(worklogList))
+	}
+
+	// 15. Search for something (FTS5 may not be available — gracefully skip).
+	_ = searchSvc.Rebuild()
+	_ = searchSvc.Index(noteNode.ID, noteNode.Title, content, notePath, "", "note")
+	results, err := searchSvc.Search("WordPress")
+	if err != nil {
+		_ = err
+	}
+	if len(results) > 0 {
+		t.Logf("search found %d results for 'WordPress'", len(results))
+	} else {
+		t.Log("search returned no results (FTS5 may not be available)")
+	}
+
+	// 16. Verify section filtering.
+	roots, err := nodeRepo.ListRoots(false, "clients")
+	if err != nil {
+		t.Fatalf("list roots by section: %v", err)
+	}
+	found := false
+	for _, r := range roots {
+		if r.ID == client.ID {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Error("client not found in section 'clients'")
+	}
+
+	// 17. Soft delete node and verify.
+	if err := nodeRepo.SoftDelete(project.ID); err != nil {
+		t.Fatalf("soft delete project: %v", err)
+	}
+	_, err = nodeRepo.GetActive(project.ID)
+	if err == nil {
+		t.Errorf("expected error getting deleted node")
+	}
+
+	// 18. Reopen app (simulate by reconnecting to same DB).
+	db2, err := storage.Open(db.Path())
+	if err != nil {
+		t.Fatalf("reopen db: %v", err)
+	}
+	defer db2.Close()
+	repo2 := nodes.NewRepository(db2)
+
+	// 19. Verify data persists.
+	client2, err := repo2.GetActive(client.ID)
+	if err != nil {
+		t.Fatalf("get client after reopen: %v", err)
+	}
+	if client2.Title != "ООО Ромашка" {
+		t.Errorf("client title after reopen = %q", client2.Title)
+	}
+
+	// 20. Verify soft-deleted node stays soft-deleted.
+	allNodes, err := repo2.ListChildren(client.ID, true)
+	if err != nil {
+		t.Fatalf("list children after reopen: %v", err)
+	}
+	if len(allNodes) == 0 {
+		t.Error("no children found after reopen")
+	}
+
+	t.Log("MVP smoke test passed!")
+}
+
+func TestMVPSmoke_WorklogReport(t *testing.T) {
+	db := openTestDB(t)
+	nodeRepo := nodes.NewRepository(db)
+	worklogSvc := worklog.NewService(db)
+
+	n, err := nodeRepo.Create("", nodes.TypeCase, "Test", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = worklogSvc.Add(n.ID, "Task 1", "", 60, true, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = worklogSvc.Add(n.ID, "Task 2", "", 30, false, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	report, err := worklogSvc.Report(n.ID)
+	if err != nil {
+		t.Fatalf("report: %v", err)
+	}
+	if !strings.Contains(report, "Task 1") || !strings.Contains(report, "Task 2") {
+		t.Error("report missing entries")
+	}
+	if !strings.Contains(report, "Task 1") || !strings.Contains(report, "Task 2") {
+		t.Error("report missing tasks")
+	}
+	t.Logf("report:\n%s", report)
+}