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/runtime/context.py

@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Any, Dict
+
+
+@dataclass(frozen=True)
+class TradingRunContext:
+    config_name: str
+    run_dir: Path
+    bootstrap_values: Dict[str, Any] = field(default_factory=dict)
+
+    def describe(self) -> str:
+        return f"Run {self.config_name} @ {self.run_dir}"