curl -X POST https://api.buntime.sh/execution/kill \
  -H "Authorization: Bearer $BUNTIME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"sessionId": "ses_abc123", "pid": 1234}'

await client.execution.kill({
  sessionId: 'ses_abc123',
  pid: 1234 // Optional
});

{
  "killed": 1,
  "pids": [1234]
}