Phase 4: Tool Registry Auto-Discovery

- @mcp_tool decorator for marking functions as tools
- ToolDiscovery class for introspecting modules and packages
- Automatic JSON schema generation from type hints
- AST-based discovery for files (without importing)
- Auto-bootstrap on startup (packages=['tools'] by default)
- Support for tags, categories, and metadata
- Updated registry with register_tool() convenience method
- Environment variable MCP_AUTO_BOOTSTRAP to disable
- 39 tests with proper isolation and cleanup

Files Added:
- src/mcp/discovery.py: Tool discovery and introspection
- src/mcp/bootstrap.py: Auto-bootstrap functionality
- tests/test_mcp_discovery.py: 26 tests
- tests/test_mcp_bootstrap.py: 13 tests

Files Modified:
- src/mcp/registry.py: Added tags, source_module, auto_discovered fields
- src/mcp/__init__.py: Export discovery and bootstrap modules
- src/dashboard/app.py: Auto-bootstrap on startup

src/mcp/__init__.py

@@ -1,17 +1,30 @@
 """MCP (Model Context Protocol) package.
 
-Provides tool registry, server, and schema management.
+Provides tool registry, server, schema management, and auto-discovery.
 """
 
-from mcp.registry import tool_registry, register_tool
+from mcp.registry import tool_registry, register_tool, ToolRegistry
 from mcp.server import mcp_server, MCPServer, MCPHTTPServer
 from mcp.schemas.base import create_tool_schema
+from mcp.discovery import ToolDiscovery, mcp_tool, get_discovery
+from mcp.bootstrap import auto_bootstrap, get_bootstrap_status
 
 __all__ = [
+    # Registry
     "tool_registry",
     "register_tool",
+    "ToolRegistry",
+    # Server
     "mcp_server",
     "MCPServer",
     "MCPHTTPServer",
+    # Schemas
     "create_tool_schema",
+    # Discovery
+    "ToolDiscovery",
+    "mcp_tool",
+    "get_discovery",
+    # Bootstrap
+    "auto_bootstrap",
+    "get_bootstrap_status",
 ]