chore: refactor agent to skill-first; structured skills dirs; enhance ReAct and tool logs

cmd/bot/main.go

@@ -57,6 +57,11 @@ func main() {
 		appLogger.Errorf("load skills failed dir=%s err=%v", cfg.SkillsDir, err)
 		panic(err)
 	}
+	skillSet, err := knowledge.LoadSkillSet(cfg.SkillsDir)
+	if err != nil {
+		appLogger.Errorf("load skill set failed dir=%s err=%v", cfg.SkillsDir, err)
+		panic(err)
+	}
 	appLogger.Infof("knowledge loaded soul_path=%s skills_dir=%s", cfg.SoulPath, cfg.SkillsDir)
 
 	llmClient := llm.NewOpenAICompatibleClient(cfg.LLM, appLogger.WithComponent("llm"))
@@ -65,6 +70,7 @@ func main() {
 		store,
 		toolRegistry,
 		soul,
+		skillSet,
 		skillsDoc,
 		cfg.ReactMaxSteps,
 		appLogger.WithComponent("agent"),