add update_inner_state tool, life loop with tools, timeout protection

- update_inner_state: LLM can update its own persistent inner state
- inner_state injected into chat loop system prompt (read-only)
- Life Loop now uses run_openai_with_tools (full tool access)
- Life Loop LLM calls wrapped in 120s tokio::time::timeout
- All reqwest clients: 120s timeout (whisper: 60s)
- doc/life.md: life loop architecture design doc
- todo.md: removed completed items

src/tools.rs

@@ -103,6 +103,20 @@ pub fn discover_tools() -> serde_json::Value {
                 }
             }
         }),
+        serde_json::json!({
+            "type": "function",
+            "function": {
+                "name": "update_inner_state",
+                "description": "更新你的内在状态。这是你自己的持续意识，跨会话保留，Life Loop 和对话都能看到。记录你对当前情况的理解、正在跟踪的事、对 Fam 状态的感知等。",
+                "parameters": {
+                    "type": "object",
+                    "properties": {
+                        "content": {"type": "string", "description": "完整的内在状态文本（替换之前的）"}
+                    },
+                    "required": ["content"]
+                }
+            }
+        }),
         serde_json::json!({
             "type": "function",
             "function": {
@@ -275,6 +289,11 @@ pub async fn execute_tool(
                 Err(e) => format!("Failed to send file: {e:#}"),
             }
         }
+        "update_inner_state" => {
+            let content = args["content"].as_str().unwrap_or("");
+            state.set_inner_state(content).await;
+            format!("Inner state updated ({} chars)", content.len())
+        }
         "update_scratch" => {
             let content = args["content"].as_str().unwrap_or("");
             state.push_scratch(content).await;
@@ -480,7 +499,8 @@ pub async fn agent_wakeup(
             let conv = state.load_conv(sid).await;
             let persona = state.get_config("persona").await.unwrap_or_default();
             let memory_slots = state.get_memory_slots().await;
-            let system_msg = build_system_prompt(&conv.summary, &persona, &memory_slots);
+            let inner = state.get_inner_state().await;
+            let system_msg = build_system_prompt(&conv.summary, &persona, &memory_slots, &inner);
             let mut api_messages = vec![system_msg];
             api_messages.extend(conv.messages);