# Development History

This document maps the internal development milestones to the initial product release.

| Development milestone | Main purpose |
|---|---|
| dev-1.8.x | Core FileExplorer and Google Drive browser-only integration |
| dev-1.9.1 - dev-1.9.3 | Tree stability, preview safety, FilePicker/FileSaver folder-tree support |
| dev-1.9.4 | Host-facing Control architecture |
| dev-1.9.5 | CommandRegistry unification |
| dev-1.9.6 | Internal View split and StateStore/EventBus connection |
| dev-1.9.7 | Google Drive UI workflow improvements |
| dev-1.9.8 | FilePicker/FileSaver completion and This Device attach workflow |
| dev-1.9.9 | Backend API contract, SecurityPolicy, CreateTypeRegistry, PreviewProviderRegistry |
| dev-2.0.0 | Stable public API contract and regression-test service |
| dev-2.1.0 | Metadata editing, Permission/Capability UI, Host bridge, backend samples |

The first public product release is:

```text
UnifiedFiler Product v1.0.0
Based on development milestone dev-2.1.0
```