feat(native): implement Phase 5 AppleScript handlers and remote control

- Implemented specialized PowerPoint/Keynote handlers with auto-focus and slideshow start.
- Added native:control-presentation for remote navigation (next/prev/stop).
- Added native:list-tools handler for self-documenting the bridge API.
- Added a comprehensive project README.md.

README.md

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+# Aether Native Launcher (Electron)
+
+The Aether Native Launcher is a specialized Electron-based shell for the Aether Platform. It provides a secure bridge between the SvelteKit web UI and the local operating system, enabling features restricted by browser sandboxing.
+
+## 🚀 Overview
+
+This application serves as the "Native Mode" runtime for Aether podiums and devices. It handles:
+- **Local File Orchestration:** Managed cache for presentation files (PPTx, Keynote, PDF).
+- **Automation:** Specialized AppleScript handlers for PowerPoint and Keynote.
+- **Hardware Telemetry:** Direct access to CPU, RAM, and Network interface data.
+- **Remote Control:** Slide navigation and application control via WebSocket intents.
+
+## ⚙️ Configuration
+
+The application requires a `seed_config.json` file to identify the device and connect to the Aether API.
+
+### 1. Seed Configuration
+Create/edit `resources/seed_config.json`:
+```json
+{
+  "event_device_id": "YOUR_DEVICE_ID",
+  "aether_api_key": "YOUR_API_KEY",
+  "primary_api_base_url": "https://api.yourdomain.com",
+  "backup_api_base_url": null
+}
+```
+
+### 2. Environment Setup
+```bash
+npm install
+npm run build
+npm start
+```
+
+## 🌉 The Native Bridge (`aetherNative`)
+
+The bridge is exposed to the renderer via `contextBridge`. It can be accessed in the web UI via `window.aetherNative`.
+
+### Core Methods
+
+| Method | Description |
+| --- | --- |
+| `list_tools()` | Returns a JSON manifest of all available native functions. |
+| `launch_presentation({path, app})` | Launches a presentation with auto-focus and slideshow start. |
+| `control_presentation({app, action})` | Sends `next`, `prev`, `start`, or `stop` to active decks. |
+| `open_folder(path)` | Opens a local directory in the OS file explorer. |
+| `get_device_info()` | Returns hardware metadata (RAM, IPs, Hostname). |
+
+### Example Usage (UI Relay)
+```typescript
+import * as native from '$lib/electron/electron_relay';
+
+// Launch a file from local cache
+await native.launch_presentation({ 
+    path: '[tmp]/my_deck.pptx', 
+    app: 'powerpoint' 
+});
+
+// Navigate slides
+await native.control_presentation({ 
+    app: 'powerpoint', 
+    action: 'next' 
+});
+```
+
+## 🛠️ Development
+
+- **Preload:** Logic defined in `src/preload/index.ts`.
+- **Handlers:** OS-level logic in `src/main/shell_handlers.ts` and `src/main/file_handlers.ts`.
+- **Types:** Shared TypeScript interfaces in `src/shared/types.ts`.