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>

crates/zclaw-kernel/Cargo.toml

@@ -11,6 +11,8 @@ description = "ZCLAW kernel - central coordinator for all subsystems"
 zclaw-types = { workspace = true }
 zclaw-memory = { workspace = true }
 zclaw-runtime = { workspace = true }
+zclaw-protocols = { workspace = true }
+zclaw-hands = { workspace = true }
 
 tokio = { workspace = true }
 tokio-stream = { workspace = true }
@@ -32,3 +34,6 @@ secrecy = { workspace = true }
 
 # Home directory
 dirs = { workspace = true }
+
+# Archive (for PPTX export)
+zip = { version = "2", default-features = false, features = ["deflate"] }