fix(agent): v0.3.10 cleanup orphan instance dirs on startup

- Add cleanupOrphanInstanceDirs() to remove leftover instance directories
  after failed deletes (common on Windows when compose.log is locked)
- Log RemoveAll errors in dockerComposeRm for better visibility
- Bump version to 0.3.10 and rebuild binaries

agent/instance.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -130,3 +131,34 @@ func getInstanceStatus(dataDir, instanceID string) string {
 	}
 	return "stopped"
 }
+
+// cleanupOrphanInstanceDirs removes instance directories that have no entry in
+// instances.json. This typically happens on Windows when a delete operation
+// could not fully remove the directory because compose.log was locked.
+func cleanupOrphanInstanceDirs(dataDir string) {
+	instancesDir := filepath.Join(dataDir, "instances")
+	inst, err := loadInstances(dataDir)
+	if err != nil {
+		log.Printf("cleanupOrphanInstanceDirs: loadInstances error: %v", err)
+		return
+	}
+	entries, err := os.ReadDir(instancesDir)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			log.Printf("cleanupOrphanInstanceDirs: ReadDir error: %v", err)
+		}
+		return
+	}
+	for _, entry := range entries {
+		if !entry.IsDir() {
+			continue
+		}
+		if _, ok := inst[entry.Name()]; !ok {
+			dir := filepath.Join(instancesDir, entry.Name())
+			log.Printf("cleanupOrphanInstanceDirs: removing orphan directory %s", dir)
+			if err := os.RemoveAll(dir); err != nil {
+				log.Printf("cleanupOrphanInstanceDirs: RemoveAll error for %s: %v", dir, err)
+			}
+		}
+	}
+}