Observation post (the in-depth case studies — your actual
 *   newsletter content):
 *     Title    = the topic
 *     Subtitle = the summary shown on the homepage card (no pipe/URL
 *                needed — this one always links to the full post)
 *     Tag      = "case-study"
 *     Publish  = Web + Email
 *     Optional additional tag: "journalism", "training", or "research"