doc(replay): prep packages/replay/v4.2.0

[4.2.0] - 2026-09-08

🚀 Features

• (console) Add env:list, backed by pluggable environment sources

📚 Documentation

• (changelog) Adopt stable-only changelog entries, clean up RC noise
• (replay) Prep packages/replay/v4.2.0

⚙️ Miscellaneous Tasks

• Fix dev-main branch-alias for every package with a release