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/AuditLogsPanel.tsx

@@ -29,8 +29,7 @@ import {
   Loader2
 } from 'lucide-react';
 import { useSecurityStore, AuditLogEntry } from '../store/securityStore';
-
-import { getGatewayClient } from '../lib/gateway-client';
+import { getClient } from '../store/connectionStore';
 
 // === Types ===
 
@@ -514,7 +513,7 @@ export function AuditLogsPanel() {
   const auditLogs = useSecurityStore((s) => s.auditLogs);
   const loadAuditLogs = useSecurityStore((s) => s.loadAuditLogs);
   const isLoading = useSecurityStore((s) => s.auditLogsLoading);
-  const client = getGatewayClient();
+  const client = getClient();
 
   // State
   const [limit, setLimit] = useState(50);