feat: Add agent workspace system and runtime management

- Add agent core modules (agent_core, factory, registry, skill_loader)
- Add runtime system for agent execution management
- Add REST API for agents, workspaces, and runtime control
- Add process supervisor for agent lifecycle management
- Add workspace template system with agent profiles
- Add frontend RuntimeView and runtime API integration
- Add per-agent skill workspaces for smoke_fullstack run
- Refactor skill system with active/installed separation

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

backend/agents/__init__.py

@@ -1,6 +1,57 @@
 # -*- coding: utf-8 -*-
+"""
+Agents package - EvoAgent architecture for trading system.
+
+Exports:
+- EvoAgent: Next-generation agent with workspace support
+- ToolGuardMixin: Tool call approval/denial flow
+- CommandHandler: System command handling
+- AgentFactory: Dynamic agent creation and management
+- WorkspaceManager: Legacy name for the persistent workspace registry
+- WorkspaceRegistry: Explicit run-time-agnostic workspace registry
+- RunWorkspaceManager: Run-scoped workspace asset manager
+- AgentRegistry: Central agent registry
+- Legacy compatibility: AnalystAgent, PMAgent, RiskAgent
+"""
+
+# New EvoAgent architecture (from agent_core.py)
+from .agent_core import EvoAgent, ToolGuardMixin, CommandHandler
+from .factory import AgentFactory, ModelConfig, RoleConfig
+from .workspace import WorkspaceManager, WorkspaceRegistry, WorkspaceConfig
+from .workspace_manager import RunWorkspaceManager
+from .registry import AgentRegistry, AgentInfo, get_registry, reset_registry
+
+# Legacy agents (backward compatibility)
 from .analyst import AnalystAgent
 from .portfolio_manager import PMAgent
 from .risk_manager import RiskAgent
 
-__all__ = ["AnalystAgent", "PMAgent", "RiskAgent"]
+# Compatibility layer
+from .compat import LegacyAgentAdapter, adapt_agent, adapt_agents, is_legacy_agent
+
+__all__ = [
+    # New architecture
+    "EvoAgent",
+    "ToolGuardMixin",
+    "CommandHandler",
+    "AgentFactory",
+    "ModelConfig",
+    "RoleConfig",
+    "WorkspaceManager",
+    "WorkspaceRegistry",
+    "WorkspaceConfig",
+    "RunWorkspaceManager",
+    "AgentRegistry",
+    "AgentInfo",
+    "get_registry",
+    "reset_registry",
+    # Legacy compatibility
+    "AnalystAgent",
+    "PMAgent",
+    "RiskAgent",
+    # Compatibility layer
+    "LegacyAgentAdapter",
+    "adapt_agent",
+    "adapt_agents",
+    "is_legacy_agent",
+]