feat: output channel redesign - per-channel output gates, LLM chain events, SDKConfig

- Output channels generate per-channel tools: output_send__{name} (type=output) + output_send__{name}_help
- content is JSON string transparently passed to plugin handler for routing
- EventAgentLLMChain: full LLM response forwarded after each turn for webui/logs
- sdk.New refactored to SDKConfig struct (no more 13 positional args)
- RegisterOutputChannel adds desc param for JSON format documentation
- channelDevice simplified (no Tools method), desc field added
- Child agent permission updated for output_send__ prefix
- System prompt: output gates, multi-call, long messages split
- WebUI: subscribes to EventAgentLLMChain in SSE, no output channel
- Tests updated for new naming convention

internal/plugins/openclaw/plugin.go

@@ -68,6 +68,7 @@ func New(name, skillsDir string) *Plugin {
 func (p *Plugin) Name() string { return p.name }
 
 func (p *Plugin) Start(s *sdk.PluginSDK) error {
+	s.SetAutoRestart(true)
 	p.sdk = s
 
 	s.Settings().RegisterDef(sdk.ConfigDef{

internal/plugins/openclaw/sidecar_test.go

@@ -326,13 +326,13 @@ func TestLoadOCPluginViaPluginStart(t *testing.T) {
 
 	var registeredTools []string
 	registeredHandlers := make(map[string]sdk.ToolHandler)
-	sdk := sdk.New("openclaw", nil, nil, nil, nil, nil, nil, nil, nil,
-		func(name string, def sdk.ToolDef, handler sdk.ToolHandler) error {
+	sdk := sdk.New("openclaw", sdk.SDKConfig{
+		RegTool: func(name string, def sdk.ToolDef, handler sdk.ToolHandler) error {
 			registeredTools = append(registeredTools, name)
 			registeredHandlers[name] = handler
 			return nil
 		},
-		nil, nil)
+	})
 
 	if err := p.Start(sdk); err != nil {
 		t.Fatalf("start plugin: %v", err)