For thousands of India’s technology professionals working in the United States, the Christmas break ended not with a smooth return to the office but with a bureaucratic cliffhanger.Routine H‑1B visa renewals at US consular posts across India were abruptly pushed back as Washington ratcheted up its vetting of applicants’ online activity.Interviews that many had expected to sail through were suddenly rescheduled for months later, leaving engineers stranded, projects disrupted and employers...