feat(agents): implement Code Commander module (Phases 1-5)

- Phase 1: Infrastructure (state, prompts, registry)
- Phase 2: Execution engine (AI adapters, security classifier, executors)
- Phase 3: Agent integration (graph nodes, routing)
- Phase 4: Streaming interaction (PTY terminal, WebSocket)
- Phase 5: Frontend integration (Vue components)

backend/app/agents/tools/__init__.py

@@ -138,3 +138,12 @@ SUB_COMMANDER_TOOLSETS = {
     "analyst_progress": ANALYST_PROGRESS_TOOLS,
     "analyst_insights": ANALYST_INSIGHT_TOOLS,
 }
+
+# Code Commander toolset (tools implemented in later phases)
+CODE_COMMANDER_TOOLSET_NAMES = [
+    "execute_code_task",
+    "get_execution_status",
+    "send_interactive_input",
+    "download_workspace",
+    "cleanup_workspace",
+]