OpenWork relicenses, paywalls Windows build

This looks less like a clean license clarification and more like a quiet boundary shift between “free” and “paid” parts of the stack.

• –The root `LICENSE` now says `/ee` content is covered by `ee/LICENSE`, while the rest remains MIT, so the repo is no longer uniformly MIT in practice.
• –The project site now advertises macOS and Linux as free, but Windows access is handled through a paid support plan.
• –That makes OpenWork feel like an open-core product: OSS desktop core, commercial enterprise/Windows layer, and cloud workers on top.
• –The concern for contributors is simple: the exact folder you touch now matters a lot more than it did before.
• –The bigger issue is communication; when licensing changes this materially, silence creates avoidable trust damage.