feat: make MediaCleaner configurable via tools.media_cleanup

Add MediaCleanupConfig with enabled, max_age_minutes, and
interval_minutes fields. MediaCleaner is only started when enabled
(default: true) and logs its effective settings at startup.

Defaults: interval=5m, max_age=30m. Operators can tune or disable
cleanup for deployments with longer async processing times.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cmd/picoclaw/cmd_gateway.go

@@ -193,8 +193,14 @@ func gatewayCmd() {
 		fmt.Println("✓ Device event service started")
 	}
 
-	mediaCleaner := utils.NewMediaCleaner()
+	if cfg.Tools.MediaCleanup.Enabled {
+		mediaCleaner := utils.NewMediaCleaner(
+			cfg.Tools.MediaCleanup.Interval,
+			cfg.Tools.MediaCleanup.MaxAge,
+		)
 		mediaCleaner.Start()
+		defer mediaCleaner.Stop()
+	}
 
 	if err := channelManager.StartAll(ctx); err != nil {
 		fmt.Printf("Error starting channels: %v\n", err)
@@ -220,7 +226,6 @@ func gatewayCmd() {
 	deviceService.Stop()
 	heartbeatService.Stop()
 	cronService.Stop()
-	mediaCleaner.Stop()
 	agentLoop.Stop()
 	channelManager.StopAll(ctx)
 	fmt.Println("✓ Gateway stopped")

pkg/config/config.go

@@ -452,11 +452,18 @@ type ExecConfig struct {
 	CustomDenyPatterns []string `json:"custom_deny_patterns" env:"PICOCLAW_TOOLS_EXEC_CUSTOM_DENY_PATTERNS"`
 }
 
+type MediaCleanupConfig struct {
+	Enabled  bool `json:"enabled" env:"PICOCLAW_TOOLS_MEDIA_CLEANUP_ENABLED"`
+	MaxAge   int  `json:"max_age_minutes" env:"PICOCLAW_TOOLS_MEDIA_CLEANUP_MAX_AGE_MINUTES"`
+	Interval int  `json:"interval_minutes" env:"PICOCLAW_TOOLS_MEDIA_CLEANUP_INTERVAL_MINUTES"`
+}
+
 type ToolsConfig struct {
 	Web          WebToolsConfig     `json:"web"`
 	Cron         CronToolsConfig    `json:"cron"`
 	Exec         ExecConfig         `json:"exec"`
 	Skills       SkillsToolsConfig  `json:"skills"`
+	MediaCleanup MediaCleanupConfig `json:"media_cleanup"`
 }
 
 type SkillsToolsConfig struct {

pkg/config/defaults.go

@@ -303,6 +303,11 @@ func DefaultConfig() *Config {
 					TTLSeconds: 300,
 				},
 			},
+			MediaCleanup: MediaCleanupConfig{
+				Enabled:  true,
+				MaxAge:   30,
+				Interval: 5,
+			},
 		},
 		Heartbeat: HeartbeatConfig{
 			Enabled:  true,

pkg/utils/media.go

@@ -154,12 +154,20 @@ type MediaCleaner struct {
 	once     sync.Once
 }
 
-// NewMediaCleaner creates a new MediaCleaner with default settings
-// (scan every 5 minutes, remove files older than 30 minutes).
-func NewMediaCleaner() *MediaCleaner {
+// NewMediaCleaner creates a new MediaCleaner with the given settings.
+// If intervalMinutes or maxAgeMinutes are <= 0, defaults are used (5 and 30 respectively).
+func NewMediaCleaner(intervalMinutes, maxAgeMinutes int) *MediaCleaner {
+	interval := time.Duration(intervalMinutes) * time.Minute
+	if interval <= 0 {
+		interval = 5 * time.Minute
+	}
+	maxAge := time.Duration(maxAgeMinutes) * time.Minute
+	if maxAge <= 0 {
+		maxAge = 30 * time.Minute
+	}
 	return &MediaCleaner{
-		interval: 5 * time.Minute,
-		maxAge:   30 * time.Minute,
+		interval: interval,
+		maxAge:   maxAge,
 		stop:     make(chan struct{}),
 	}
 }
@@ -168,7 +176,10 @@ func NewMediaCleaner() *MediaCleaner {
 func (mc *MediaCleaner) Start() {
 	mc.once.Do(func() {
 		go mc.loop()
-		logger.InfoC("media", "Media cleaner started")
+		logger.InfoCF("media", "Media cleaner started", map[string]any{
+			"interval": mc.interval.String(),
+			"max_age":  mc.maxAge.String(),
+		})
 	})
 }
 

pkg/utils/media_test.go

@@ -35,7 +35,7 @@ func TestMediaCleanerRemovesOldFiles(t *testing.T) {
 	defer os.Remove(newFile)
 
 	// Run cleanup directly
-	mc := NewMediaCleaner()
+	mc := NewMediaCleaner(5, 30)
 	mc.cleanup()
 
 	// Old file should be gone
@@ -50,7 +50,7 @@ func TestMediaCleanerRemovesOldFiles(t *testing.T) {
 }
 
 func TestMediaCleanerStartStop(t *testing.T) {
-	mc := NewMediaCleaner()
+	mc := NewMediaCleaner(5, 30)
 
 	// Start should not panic
 	mc.Start()