feat: 添加 /context 命令显示会话上下文使用情况

- 集成 picoclaw v0.2.7 的上下文统计功能
- 显示消息数、token 使用量、压缩阈值和剩余空间
- 在 interactiveMode 和 simpleInteractiveMode 中均支持

cmd/hxclaw/main.go

@@ -156,6 +156,11 @@ func interactiveMode(agentLoop *agent.AgentLoop, sessionKey string) {
 			continue
 		}
 
+		if strings.HasPrefix(input, "/context") {
+			handleContextCommand(agentLoop, sessionKey)
+			continue
+		}
+
 		if isTempTTS {
 			enabled := internal.ToggleTTS()
 			if enabled {
@@ -224,6 +229,11 @@ func simpleInteractiveMode(agentLoop *agent.AgentLoop, sessionKey string) {
 			continue
 		}
 
+		if strings.HasPrefix(input, "/context") {
+			handleContextCommand(agentLoop, sessionKey)
+			continue
+		}
+
 		if isTempTTS {
 			internal.ToggleTTS()
 		}
@@ -513,3 +523,80 @@ func handleSessionsCommand() {
 		fmt.Printf("  %s | %d 条消息 | %s\n", s.UUID[:8], len(s.ChatIDs), summary)
 	}
 }
+
+func handleContextCommand(agentLoop *agent.AgentLoop, sessionKey string) {
+	if agentLoop == nil {
+		fmt.Println("无法获取上下文信息")
+		return
+	}
+
+	cfg := agentLoop.GetConfig()
+	if cfg == nil {
+		fmt.Println("无法获取配置信息")
+		return
+	}
+
+	registry := agentLoop.GetRegistry()
+	if registry == nil {
+		fmt.Println("无法获取代理注册信息")
+		return
+	}
+
+	instance := registry.GetDefaultAgent()
+	if instance == nil {
+		fmt.Println("无可用代理")
+		return
+	}
+
+	contextWindow := instance.ContextWindow
+	if contextWindow <= 0 {
+		fmt.Println("上下文窗口大小未知")
+		return
+	}
+
+	history := instance.Sessions.GetHistory(sessionKey)
+	historyTokens := 0
+	for _, m := range history {
+		historyTokens += agent.EstimateMessageTokens(m)
+	}
+
+	systemTokens := 0
+	if instance.ContextBuilder != nil {
+		summary := instance.Sessions.GetSummary(sessionKey)
+		systemTokens = instance.ContextBuilder.EstimateSystemTokens(summary, nil)
+	}
+
+	toolTokens := 0
+	if instance.Tools != nil {
+		toolDefs := instance.Tools.ToProviderDefs()
+		toolTokens = agent.EstimateToolDefsTokens(toolDefs)
+	}
+
+	usedTokens := historyTokens + systemTokens + toolTokens
+
+	effectiveWindow := contextWindow - instance.MaxTokens
+	if effectiveWindow < 0 {
+		effectiveWindow = contextWindow
+	}
+
+	compressAt := effectiveWindow
+	usedPercent := 0
+	if compressAt > 0 {
+		usedPercent = usedTokens * 100 / compressAt
+	}
+	if usedPercent > 100 {
+		usedPercent = 100
+	}
+
+	remaining := compressAt - usedTokens
+	if remaining < 0 {
+		remaining = 0
+	}
+
+	fmt.Println("上下文使用情况")
+	fmt.Printf("消息数: %d\n", len(history))
+	fmt.Printf("已用: ~%d / %d tokens (%d%%)\n", usedTokens, contextWindow, usedPercent)
+	fmt.Printf("压缩阈值: %d tokens\n", compressAt)
+	fmt.Printf("压缩进度: %d%%\n", usedPercent)
+	fmt.Printf("剩余: ~%d tokens\n", remaining)
+}