"ai-engineer-complete [401/465] - \"003 Defining Tools with JSON Schema.mp4\"": the subject's text shares no word with the lesson's descriptive name, so it was taken for a poster's constant tag and each of the course's 465 files keyed a release of its own (releases 75941915, 75941916). A stem starting with a 1-3 digit index and a separator is an item of a set the subject names, as audio tracks and images already were; uploads hours apart stay apart by the re-upload rule. Both implementations; tests; fixtures identical. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>