Infra/CC[INFRA] Built /caption skill + burn-in caption engine
Built [.claude/skills/caption/SKILL.md](../../../.claude/skills/caption/SKILL.md) + engine [content/captions/_engine/caption.py](../../../content/captions/_engine/caption.py). Drop a raw clip in `active/captions/inbox/`, it transcribes the real spoken audio (faster-whisper, word timestamps), fixes brand mishears (clawed→Claude, chachi pt→ChatGPT) + collapses the spoken URL to chrisexplainsai.com/free on one line, and burns the Chris-approved CapCut style: Nunito rounded indigo title box + Outfit white/black-outline captions with the active word turning indigo word-by-word, centered. Fonts instanced from Google Fonts variable files. Going forward Claude writes all captions/titles and burns captions from the dropped clips (auto-matching each to its script).