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Has a full linux image--something you can actually boot--existed as a reproducible build before today?

I have to imagine it's been done, at least with some stripped-down kernel+busybox situation. Not sure, though.

Forgive my ignorance but isn’t that Slackware?

No, if I build Slackware on my computer and you build Slackware on yours; the binaries we end up with will not be bit-for-bit identical.