v1.6

- **WhatsApp integration plugin** — New plugin connecting Agent Zero to WhatsApp via a Baileys JS bridge with QR/pairing-code setup. Supports self-chat and dedicated (bot account) modes, group chat with mention detection, quoted replies, media/attachment handling, typing indicators, Markdown-to-WhatsApp formatting, and account disconnect/switch.
- **WhatsApp: self-chat is now the default mode** — Default changed from dedicated to self-chat; a warning banner is shown when `allowed_numbers` is empty in this mode.
- **WhatsApp: allowed-numbers filtering moved to Python** — Phone number filtering now happens in the Python poll handler (reading config fresh each cycle) rather than the JS bridge, fixing a bug where LID-based matching never worked.
- **WhatsApp: improved bridge reliability** — Corrupt or missing `node_modules` are detected and automatically reinstalled; the poll loop stops after 5 consecutive bridge failures instead of spamming errors; Node.js absence halts the loop immediately; bridge restarts automatically when configuration changes.
- **WhatsApp: storage paths centralized** — Session and media files moved from `usr/whatsapp` to `tmp/whatsapp` via a new `storage_paths.py` helper; paths are now consistent across all modules.
- **Settings: API keys no longer overwritten on save** — Saving general settings no longer clobbers API keys that were set via the Configure Models dialog.
- **Settings: model config UI fixes** — Restored provider fallback and empty option for utility preset; extracted a reusable model-field component and unified API key lifecycle handling.
- **UI server restructuring** — Server setup extracted into a `UiServerRuntime` class with modular initialization; environment config, route registration, and transport handlers moved to `helpers/ui_server.py`.
- **Update system enhancements** — Added `released_at` timestamp tracking for git tags and branch heads; new `get_current_major_main_latest_info` finds the latest same-major version on the main branch; `major_upgrade_versions` and `main_branch_latest` fields added to the update info payload.