…" in the documentation. Based on the previous search results, here are some key files we should modify:

1. main/guides/js-programming/eventual-send.md
2. main/guides/js-programming/far.md
3. main/guides/zoe/contract-upgrade.md
4. main/reference/networking.md

Would you like me to proceed with generating diffs for these files? I'll ensure:
- Replace "vat" with "worker"
- Add historical reference info boxes
- Preserve existing links and anchors
- Maintain the context and technical meaning

Shall I show you the proposed changes for review?