docs(channel): clarify channel-only validation scope

cmd/picoclaw/internal/channel/start.go

@@ -19,6 +19,8 @@ func newStartCommand() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "start",
 		Short: "Start channels without gateway side services",
+		Long: "Start enabled channels and AgentLoop without gateway side services.\n\n" +
+			"This mode is channel-agnostic and follows your config. Current runtime validation is primarily focused on QQ; other channels are continuously validated.",
 		Args:  cobra.NoArgs,
 		PreRunE: func(_ *cobra.Command, _ []string) error {
 			if noTruncate && !debug {

docs/configuration.md

@@ -53,6 +53,8 @@ Compared with `picoclaw gateway`, channel-only runtime:
 - Does **not** start Cron service, Heartbeat service, Device service
 - Does **not** enable config hot reload or `/reload`
 
+Validation note: channel-only runtime is channel-agnostic by design. Current runtime validation is primarily focused on QQ, while other channels are continuously validated.
+
 Use `picoclaw gateway` if you need the full control plane and background services.
 
 ### Gateway Log Level

docs/zh/configuration.md

@@ -51,6 +51,8 @@ picoclaw channel start --debug
 - **不会** 启动 Cron、Heartbeat、Device 服务
 - **不会** 启用配置热更新和 `/reload`
 
+验证说明：channel 独立运行模式在设计上对各渠道通用。当前运行时验证主要覆盖 QQ，其他渠道仍在持续验证中。
+
 若需要完整控制面与后台服务，请使用 `picoclaw gateway`。
 
 ### Gateway 日志等级