container lifecycle management

doc/m_c_p_tools_architecture.md

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+MCP Tools (User Container)
+├── Memory
+│   ├── get_conversation_history(limit)
+│   ├── save_message(role, content)
+│   ├── search_memory(query)          ← semantic search over past conversations
+│   └── get_context_summary()         ← "who is this user, what do they care about"
+│
+├── Strategies & Indicators
+│   ├── list_strategies()
+│   ├── read_strategy(name)
+│   ├── write_strategy(name, code)
+│   ├── list_indicators()
+│   ├── read_indicator(name)
+│   ├── write_indicator(name, code)
+│   └── run_backtest(strategy, params)
+│
+├── Preferences
+│   ├── get_preferences()
+│   ├── set_preference(key, value)
+│   └── get_agent_prompt()            ← user's custom system prompt additions
+│
+├── Trading
+│   ├── get_watchlist()
+│   ├── execute_trade(params)
+│   ├── get_positions()
+│   └── get_trade_history()
+│
+└── Sandbox
+    └── run_python(code)              ← datascience toolset, matplotlib, etc.