feat: re-enable cronTool service after refactor completion

Re-enable cronTool service integration after completing the ToolResult
refactor (US-016). Removed all temporary disable comments and restored
full cron service lifecycle including start/stop operations.

Additional improvements:
- Add thread-safe access to onHeartbeatWithTools handler
- Fix channel parsing to handle user IDs with special characters
- Add error handling for state file loading failures

cmd/picoclaw/main.go

@@ -30,8 +30,7 @@ import (
 	"github.com/sipeed/picoclaw/pkg/migrate"
 	"github.com/sipeed/picoclaw/pkg/providers"
 	"github.com/sipeed/picoclaw/pkg/skills"
-	// TEMPORARILY DISABLED - cronTool is being refactored to use ToolResult (US-016)
-	toolsPkg "github.com/sipeed/picoclaw/pkg/tools" // nolint: unused
+	"github.com/sipeed/picoclaw/pkg/tools"
 	"github.com/sipeed/picoclaw/pkg/voice"
 )
 
@@ -39,8 +38,6 @@ var (
 	version   = "0.1.0"
 	buildTime string
 	goVersion string
-	// TEMPORARILY DISABLED - cronTool is being refactored to use ToolResult (US-016)
-	_ = toolsPkg.ErrorResult // nolint: unused
 )
 
 const logo = "🦞"
@@ -653,8 +650,7 @@ func gatewayCmd() {
 		})
 
 	// Setup cron tool and service
-	// TEMPORARILY DISABLED - cronTool is being refactored to use ToolResult (US-016)
-	// cronService := setupCronTool(agentLoop, msgBus, cfg.WorkspacePath())
+	cronService := setupCronTool(agentLoop, msgBus, cfg.WorkspacePath())
 
 	heartbeatService := heartbeat.NewHeartbeatService(
 		cfg.WorkspacePath(),
@@ -709,11 +705,10 @@ func gatewayCmd() {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	// TEMPORARILY DISABLED - cronTool is being refactored to use ToolResult (US-016)
-	// if err := cronService.Start(); err != nil {
-	// 	fmt.Printf("Error starting cron service: %v\n", err)
-	// }
-	// fmt.Println("✓ Cron service started")
+	if err := cronService.Start(); err != nil {
+		fmt.Printf("Error starting cron service: %v\n", err)
+	}
+	fmt.Println("✓ Cron service started")
 
 	if err := heartbeatService.Start(); err != nil {
 		fmt.Printf("Error starting heartbeat service: %v\n", err)
@@ -733,8 +728,7 @@ func gatewayCmd() {
 	fmt.Println("\nShutting down...")
 	cancel()
 	heartbeatService.Stop()
-	// TEMPORARILY DISABLED - cronTool is being refactored to use ToolResult (US-016)
-	// cronService.Stop()
+	cronService.Stop()
 	agentLoop.Stop()
 	channelManager.StopAll(ctx)
 	fmt.Println("✓ Gateway stopped")
@@ -1040,7 +1034,7 @@ func setupCronTool(agentLoop *agent.AgentLoop, msgBus *bus.MessageBus, workspace
 	cronService := cron.NewCronService(cronStorePath, nil)
 
 	// Create and register CronTool
-	cronTool := toolsPkg.NewCronTool(cronService, agentLoop, msgBus, workspace)
+	cronTool := tools.NewCronTool(cronService, agentLoop, msgBus, workspace)
 	agentLoop.RegisterTool(cronTool)
 
 	// Set the onJob handler

pkg/heartbeat/service.go

@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 	"sync"
 	"time"
 
@@ -203,13 +204,17 @@ func (hs *HeartbeatService) ExecuteHeartbeatWithTools(prompt string) {
 
 // executeHeartbeatWithTools is the internal implementation of tool-supporting heartbeat.
 func (hs *HeartbeatService) executeHeartbeatWithTools(prompt string) {
-	// Check if handler is configured
-	if hs.onHeartbeatWithTools == nil {
+	// Check if handler is configured (thread-safe read)
+	hs.mu.RLock()
+	handler := hs.onHeartbeatWithTools
+	hs.mu.RUnlock()
+
+	if handler == nil {
 		hs.logError("onHeartbeatWithTools handler not configured")
 		return
 	}
 
-	result := hs.onHeartbeatWithTools(prompt)
+	result := handler(prompt)
 
 	if result == nil {
 		hs.logInfo("Heartbeat handler returned nil result")
@@ -343,12 +348,13 @@ func (hs *HeartbeatService) sendResponse(response string) {
 	}
 
 	// Parse channel format: "platform:user_id" (e.g., "telegram:123456")
-	var platform, userID string
-	n, err := fmt.Sscanf(lastChannel, "%[^:]:%s", &platform, &userID)
-	if err != nil || n != 2 {
+	// Use SplitN to handle user IDs that may contain special characters
+	parts := strings.SplitN(lastChannel, ":", 2)
+	if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
 		hs.logError("Invalid last channel format: %s", lastChannel)
 		return
 	}
+	platform, userID := parts[0], parts[1]
 
 	// Send to channel
 	ctx := context.Background()

pkg/state/state.go

@@ -3,6 +3,7 @@ package state
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"os"
 	"path/filepath"
 	"sync"
@@ -45,7 +46,10 @@ func NewManager(workspace string) *Manager {
 	}
 
 	// Load existing state if available
-	sm.load()
+	if err := sm.load(); err != nil {
+		// Log warning but continue with empty state
+		log.Printf("[WARN] state: failed to load state file, starting fresh: %v", err)
+	}
 
 	return sm
 }