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/main.go

@@ -62,6 +62,10 @@ func main() {
 
 	log.Printf("[%s Agent] version=%s node=%s data-dir=%s server=%s", APP_NAME, version, cfg.NodeID, *dataDir, cfg.Server)
 
+	// Clean up instance directories left behind by failed deletes (common on
+	// Windows when compose.log is locked during removal).
+	cleanupOrphanInstanceDirs(*dataDir)
+
 	// Ensure Podman machine DNS is configured on Windows/macOS so images can be
 	// pulled and containers can reach the internet.
 	ensurePodmanMachineDNS()