release(v0.2.0): streaming, MCP protocol, Browser Hand, security enhancements

## Major Features

### Streaming Response System
- Implement LlmDriver trait with `stream()` method returning async Stream
- Add SSE parsing for Anthropic and OpenAI API streaming
- Integrate Tauri event system for frontend streaming (`stream:chunk` events)
- Add StreamChunk types: Delta, ToolStart, ToolEnd, Complete, Error

### MCP Protocol Implementation
- Add MCP JSON-RPC 2.0 types (mcp_types.rs)
- Implement stdio-based MCP transport (mcp_transport.rs)
- Support tool discovery, execution, and resource operations

### Browser Hand Implementation
- Complete browser automation with Playwright-style actions
- Support Navigate, Click, Type, Scrape, Screenshot, Wait actions
- Add educational Hands: Whiteboard, Slideshow, Speech, Quiz

### Security Enhancements
- Implement command whitelist/blacklist for shell_exec tool
- Add SSRF protection with private IP blocking
- Create security.toml configuration file

## Test Improvements
- Fix test import paths (security-utils, setup)
- Fix vi.mock hoisting issues with vi.hoisted()
- Update test expectations for validateUrl and sanitizeFilename
- Add getUnsupportedLocalGatewayStatus mock

## Documentation Updates
- Update architecture documentation
- Improve configuration reference
- Add quick-start guide updates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/components/ConnectionStatus.tsx

@@ -9,8 +9,7 @@
 import { useState, useEffect } from 'react';
 import { motion, AnimatePresence } from 'framer-motion';
 import { Wifi, WifiOff, Loader2, RefreshCw, Heart, HeartPulse } from 'lucide-react';
-import { useConnectionStore } from '../store/connectionStore';
-import { getGatewayClient } from '../lib/gateway-client';
+import { useConnectionStore, getClient } from '../store/connectionStore';
 import {
   createHealthCheckScheduler,
   getHealthStatusLabel,
@@ -90,7 +89,7 @@ export function ConnectionStatus({
 
   // Listen for reconnect events
   useEffect(() => {
-    const client = getGatewayClient();
+    const client = getClient();
 
     const unsubReconnecting = client.on('reconnecting', (info) => {
       setReconnectInfo(info as ReconnectInfo);