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There's no support for the 32 bit OSX runtime. The 32 bit iOS is similar to the 64 bit iOS/OSX runtime and works fine.

Swift code is binary compatible with obj-c and xcode embeds a small Swift runtime library shim into your application for prior versions.

But I really haven't tried it myself so someone else who has may be able to help you.

What makes you think they do?

The fact that I'm writing Swift apps, releasing them to App Store and testing those apps on iPhone 5/4s and having zero problems with that?

The "32 bit Runtime" is a misnomer. Its a difference between the modern and legacy runtime. iOS (and iPhoneOS) never supported the legacy runtime.

The name comes from it being the only runtime for 32 bit OSX apps.

the legacy runtime before the `non-fragile` one?

1) I can run a Swift game on iPhone 5 which is still 32-bit.