- Add READMEs for all 5 packages (core, engine, producer, cli, studio)
with install, overview, basic usage, and links to full docs
- Rewrite core README from internal doc to OSS-facing format
- Polish root README: add badges, packages table, docs link, requirements
- Add AI usage policy and BDFL governance statement to CONTRIBUTING.md
- Genericize license references (pending final license decision)
- Docs URL set to hyperframes.heygen.com
Addresses VA-850.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
